whitepaper_workday_technology_platform_devt_process

Workday’s Technology Platform and
Development Processes

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Executive Summary
Enterprise applications need to be easy to use and
even easier to own. Workday approaches enterprise-
application design with that guiding principle in mind.
The path to developing new enterprise applications
is a revolutionary leap, not an evolutionary process.
New enterprise applications require fresh thinking on
several levels.
• Delivery model
• Technology platform
• Development processes
• Application design
Workday began as an enterprise-software company
that made a clean start in all these areas. We adopted
SaaS as the best delivery model for enterprise
applications and applied innovative design to our
Financial and HCM applications.
This white paper focuses on Workday’s technology
platform and development processes. It addresses the
demands of today’s workforce for enterprise applications.
We discuss why a new architectural approach is
necessary for enterprise-application platforms and why
traditional development processes for building and
delivering enterprise applications must change. Finally,
we describe the components of the technology platform
and development processes that are the basis for
Workday’s products.
New Requirements
Workday was created with the idea that core enterprise
applications can be easier to use and own than they have
been historically.
Easier to Use
Traditionally, enterprise applications have not been
widely used throughout the enterprise. Back-office
professionals were trained to use the application to
update and access data. The rest of the enterprise was
not active on these systems and depended on these
trained professionals and the reports and spreadsheets
they generated.
Workday believes that everyone in the organization must
be able to use enterprise applications, rather than having
to engage IT to perform tasks and generate reports. This
self-service approach for employees and managers should
not require training or come as add-on modules. We
benchmark the overall user experience of an enterprise
application against the consumer-Internet applications
that most workers in any company are accustomed to
using today.
Mobile access must be delivered as a native part of the
user experience, not as an add-on platform or module or
as multiple standalone applications. As user-engagement
patterns change, the user experience must constantly
improve to take advantage of new usage patterns.
Workday’s Technology Platform and
Figure 1

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Enterprise applications that focus exclusively on
transactions usually fail to meet business-user
expectations. The business user wants to be able to
analyze current transactional data in the context of
the transaction, and take action based on that analysis.
Because traditional systems were built to collect
transactions, analysis can only happen in a separate
system with separate security, and the user is unable to
act on the analysis.
Workday believes that the divides between transactions,
analysis, and actionability can be closed with systems
that support these three activities natively over a single
copy of the data and with a single approach to security.
Easier to Own
Enterprise applications must change when the business
changes. Businesses have evolved, but enterprise
applications have struggled to keep up. Traditional
architectures included customization tools with the
application so that customers could make ongoing
changes to their implementations. Unfortunately, making
changes to the applications has become more difficult and
expensive. Customers often neglect to update to the latest
version because of the complexity involved with many
customizations. So, customers cannot take advantage of
new innovations and best practices, and they fall behind
the pace of the market.
Workday believes that customers must be able to
continuously adopt new vendor features without
expensive upgrades. For customers to be able to
seamlessly apply new system capabilities without
costly re-implementation for customizations and data
conversion, the vendor must take care of data migration
to new releases and updates. When the vendor adopts
a continuous-development model where new features
are rolled out daily or weekly, vendor responsibility for
updates is critical.
Workday has created a new model that allows
customers to customize the application without risking
the integrity of the system. The traditional way of
applying customizations through data-model changes
and programming hundreds of lines of code has been
replaced with the ability to configure the application
through guided interfaces. This model enables customers
to continue functioning from release to release because
the underlying data model and application code is
not modified.
Managing the infrastructure to run an enterprise
application is a highly specialized task and requires a
team of experts in security, hardware and software
scaling, disaster recovery, performance management,
system administration, and networking. Assembling,
training, and managing such a team should not be required
of customers that deploy an enterprise application.
Finally, building and maintaining integrations between
enterprise applications and other applications that
a customer owns should not be a large part of the
overall cost of ownership. Workday believes that it is
cost-effective to include integration tooling as a part
of the application and offer more resilient application-
programming interfaces for integrating systems. If the
integration platform is a native part of the underlying
application platform, then integrations can surface
through the application for easier customer consumption
and tighter alignment to the application.

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The Need for a New Approach
Delivering against new requirements demands fresh
thinking about enterprise-application architecture
development processes.
A brief review of legacy architectures is helpful.
Traditional enterprise applications have employed
an architectural approach that can be described as
“relational client-server.” Developers create a relational
model in the database layer to describe the structure of
the application. Then, they write code in the business-
logic layer to store and retrieve data from the database,
and to present data and transactional pages in the
presentation layer (typically an Internet browser).
Users
Business Logic Security
Internet Browser
Systems Data in RDBMS Cube
Users
1 1
10
0 0
Systems
1 1
10
0 0
01 INPUT NAME “JOHN”
02 INPUT TITLE
“PROJECT MANAGER”
03 PRINT “INPUT NAME”
“INPUT TITLE”
This type of traditional architecture allows you to reliably
capture transactions at scale and to produce reports of
transactional history.
We had three concerns with this architectural approach
when we started Workday:
1. Complexity: Complex applications require complex
database schemas with many tables to describe
application structure and many lines of code to
describe the application behavior. Typical
enterprise applications end up being millions of
lines of code talking to thousands of tables. Any
significant change to the application requires making
and coordinating changes at both of these levels.
2. Integration: Integration to other systems is
accomplished either by getting exports and
imports of transactional data (typically in files) or
by interacting with an application programming
interface (API) at the business-logic level. While
it is easy to get data out of a relational database,
doing this directly circumvents the security and
business logic built into the application. Using APIs
to interact with the application can be complicated
because APIs are typically built after the fact and
have to interact with business logic that assumes
that it’s talking with a user, not another system.
3. Business Intelligence (BI): These architectures
feature detailed transactional reporting, but
they do not report in a way that business users
care about. Most applications built on these
architectures transfer data to separate BI tools to
get acceptable reporting and analytics for business
users. Once a copy of the data is made, you have
to secure access to it and worry about how out-of-
sync it is with the live data in the application.
Workday also had concerns with traditional development
processes. Traditional development was designed to
support large and infrequent releases. Development is
done on a separate code-line from production. Programs
to convert existing customers to the new release are
typically built after the release is built. The infrastructure
to run the application is either the responsibility of
the customer (for on-premise deployments) or an
infrastructure team that is not part of development.
Figure 2

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These concerns led us to adopt a different architectural
approach for Workday’s development and runtime platform.
We decided to pursue development processes that would
support frequent updates and continuous change.
New Platform and Development Process
Because of concerns with traditional relational client-
server architectures, Workday decided to take a
new approach at every level of its architecture. This
approach would fully support the Software-as-a-Service
deployment model.
Workday’s mission is to deliver superior enterprise-
application user experience. Workday applications are
the center of gravity for everything that is done through
Workday’s platform and architecture.
The following diagram features a high-level look at
Workday’s platform architecture.
Workday Applications
Workday’s foundation is built on Java. We also created
a metadata abstraction layer to simplify development.
This language is called “XpressO.” It allows application
developers to abstract themselves from implementation-
specific details that prevent unnecessary technical
dependencies and it facilitates Workday’s architecture
evolution over time.
Workday application developers can focus on the
functional aspects of the applications without worrying
about technical and implementation details such as
persistence, transactions, scalability, and datacenter
locations. We can focus instead on delivering functional
apps with great user experience.
Figure 3
SystemsUsers
Payroll StudentFinancial
Management
Human Capital
Management
Insight
Applications
Professional
Services
Automation
APPLICATIONS
Workday Cloud
TECHNOLOGY
Mobile | Web | Transactions | Reporting | Analytics | Integration | Machine Learning | Collaboration | Jobs | Printing
PLATFORM
Messaging | Content Storage | Service Discovery | Authentication | Statistics | Logging | Monitoring
PERSISTENCE
Durable Storage | Encryption at Rest | Replication | Disaster Recovery
INFRASTRUCTURE
Data Centers | Availability Zones | Compute | Storage | Networking | Key Management

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One of the important design principles is Workday’s
approach to data storage. Workday uses a relational
database to store transactional data, but we do not use a
relational database to model the core of our applications.
All application transactions are persisted in a MySQL
database, but the schema for that database bears no
resemblance to any of our applications (for example there
is no Account or Worker table). The schema consists of
just a few tables optimized for storing application data
and metadata.
To maximize security, all access to the database comes
through Workday’s application services. This setup means
that no customer employees have direct access to the
database (not even IT). Using a simplified schema to store
transactional data means that we do not have to worry
about schema changes for all of our customers when we
release new features and perform weekly upgrades.
Different services in Workday’s architecture and platform
collaborate to interpret the application metadata
that Xpresso creates when it processes application
transactions and manual or automated requests. By
clearly separating how applications are defined from its
implementation-platform details, new applications can
be brought online quickly, as Workday has demonstrated
since its early days.
To make applications easy to author and maintain,
Workday built its architecture following a core set of
design principles that primarily address the challenges
outlined in our previous section. These design principles
have had a radical positive effect on how Workday
delivers applications and our ability to evolve continuously.
Figure 4
SystemsUsers
Applications
Payroll StudentFinancial
Management
Human Capital
Management
Insight
Applications
Professional
Services
Automation
APPLICATIONS

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A second very important design principle is the use of a
metadata-object model to describe the structure and
behavior of the application. Here is where XpressO comes
into play. There is no code-based procedural logic in a
Workday application. Instead, Workday developers define
the structure of our applications by defining classes for the
key business objects in the application. Classes can have
relationships to other classes, attributes, and methods.
Methods define the behavior of the application, and the
business logic is defined by declarative relationships
without the need to write any procedural code.
All of these parts of the object model (classes, relationships,
attributes, and methods) are created through a forms-
based set of tasks. The resulting application is a collection
of metadata definitions for each part of the application-
object model. These definitions are stored as collections
of simple Java objects in the memory of the Java virtual
machine (VM) that is the runtime for all Workday
applications. The Java runtime knows how to interpret
the metadata definitions into the transactions (tasks and
reports) that make up the application.
Based on these two design principles, Workday decided
to maintain core-application data in-memory, along
with all of the metadata definitions of the application.
Having the data in-memory means that most Workday
reports are produced without having to access the
database. Having the in-memory data organized in an
object model that features a rich network of relationships
between classes means that Workday reports can offer
multidimensional analysis along with data presentation.
A simple example of this capability is a headcount
report. To display the headcount for an organization, the
application collects and counts all instances of all workers
in that organization. The result is an in-memory cube
where you can further explore all the dimensions of data
relating to the worker object.
Figure 5

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This approach to defining and running applications has
many benefits.
• Developer productivity: You can think of relational
client-server applications as millions of lines of code
interacting with thousands of relational tables. The
definitional approach that Workday uses results in
applications that are millions of cross-referenced
metadata definitions. While there is nothing simple
about huge numbers of metadata definitions,
organizing the application this way enables our
developers to continuously enhance and re-factor
our applications and to deliver these changes into
existing customer implementations in an upgrade-
safe manner.
• Single-transaction-processing model for requests
from users and systems: All requests coming into
Workday are processed the same way. The request
must come from a valid and authenticated user
ID. All requests are put into the same queue for
processing and are processed and audited the same
way. There is no separate processing approach
or language for “batch” processing vs. online
processing, and there is no direct read or write
access to the relational database.
• Single-security model for all data access:
Role-based security is used for all transactional
access to data in Workday applications. Complex
systems often have different ways of securing
access to data. This is especially true of access from
custom reports and analytical tools. In Workday, the
custom-report writer applies role-based security at
a granular level of data for all reports that a
customer creates. The same role-based authorization
applies to mobile access, analytical tools,
dashboards, the Insight Service, access through our
web services API, and workflow processed in our
Business Process Framework.
• Configurability of applications: Workday supports
configurability and extensibility of its applications.
Customers create their own metadata for assets like
business processes and custom reports, and they
add their own custom fields to existing Workday
objects. It is difficult to make sure that code-based
extensions to an application are “upgrade-safe,” so
this configuration is done without coding. The result
is a tenant-specific version of application metadata
that Workday’s runtime knows how to process
and update, even for a new release. Workday’s
customers can configure with confidence knowing
that they will not have to revisit and repair their
work on successive updates to the product.
Technology
The Technology services involve the most innovations
and evolution over time. Each tenant’s application
requests are processed via a collection of specialized
services that execute the requested transaction in a
secure and scalable manner that guarantees optimum
performance. This capability evolved from a unique
central-processing service to a collection of well-
coordinated distributed services.
The Technology services can be subsumed into three main
sets: Transactions, Data Management, and Compute services.
The Transactions service is primarily responsible for
processing requests coming from user-triggered actions,
such as tasks or reports. The Transactions services use
an in-memory representation of the tenant’s data and
execute the needed request logic. Each tenant has a
single “update transaction service” (object transaction
service or OTS) that manages all transactions that update
any information.

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When a task request comes in to Workday, it’s handed off
to the appropriate class in the object model that knows
how to process that update. The appropriate methods
are called to process validations on the updated data. If
the validations pass, the updates are made to in-memory
data and are recorded in the database via the Persistence
services. The application must receive a commit from the
database update for the new values of the in-memory
data to be visible to other transactions in all active
tenant-compute services.
The database is always the system-of-record for all
application data, even though it is rarely used for
reporting and querying, thanks to the in-memory copy of
the data. The particular aspects of synchronizing and
managing data in the Transactions Service and Compute
Services are performed by the Data Management services.
The Data Management Service is at the core of Workday’s
scalability approach. One of the primary components of
the Data Management Service is the “data cache” that
maintains a compressed copy of all core-application
data and metadata (or “instance cache”) comprising the
Workday application. Workday uses the instance cache to
quickly make snapshots of customer data when starting
up one of the report or calculation-compute services
mentioned earlier, and to reconstruct data in the memory
of the customer’s Update Transaction Service or other
Compute services to a specific time. This allows the
instance cache to be selective about which instances must
be in the “main” Update Transaction Service memory
without having to pay the price of going to disk if we
need to access a less-frequently used instance.
However, not all processing happens in the customer’s
Update Transaction Service. Workday’s Compute services
allow us to offload requests for reports, searches,
Figure 6
SystemsUsers
Technology Services-
Transaction Systems
TRANSACTIONS
TECHNOLOGY
DATA MANAGEMENT COMPUTE SERVICES
Update
Transaction
Service (OTS)
Read
Transaction
Services (ORS)
Data Cache
Insight
Doc
Store
Integration
SYMAN
Elastic
Grid
Jobs
Printing
Query
Service
Search
Service

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printing, integration logic, and large calculations (such
as Payroll) to dedicated services running on separate
Java virtual machines on separate hardware to scale
appropriately. This process enables Workday to distribute
processing more efficiently and effectively when greater
compute cycles are needed for longer-running requests or
increased capacity.
A set of Big Data services also analyzes third-party
data loaded by customers into Workday’s cloud. These
services return the results of MapReduce operations
over the customer’s data, which is stored in Hadoop)
to the customer’s Data Management services for use
in Workday reports via the Insight Service. The Insight
Service also provides scores such as retention risk,
which are the result of machine-learning models that
access data through Workday’s SYMAN service. SYMAN’s
service manages the collection and analysis of data and it
normalizes terminology and applies machine learning to
generate predictions and recommendations for the Insight
Compute service.
Workday has always been an in-memory application.
From day one, Workday has kept core customer data
in the memory space of our Java-based OTS. However,
over the years, Workday has evolved its single OTS
into a separate layer of services (Transactions, Data
Management, and Compute services) to take advantage of
the benefits of in-memory data in order to bring higher
levels of performance and scalability to our applications.
Workday believes that continuously enhanced in-
memory data management is the path to continuous
scale for our applications. It is no longer a problem to be
solely addressed by databases on disk-serving data to
applications via SQL. Our in-memory data services are an
essential part of a highly optimized multilevel-caching
approach to managing application data.
The figure below illustrates how the Update Transaction
service interacts with the Data Management service to
retrieve data for processing on the Update Transaction
service and other tenant live-compute services.
Figure 7
SystemsUsers
Technology Services-
Transaction Systems
TECHNOLOGY
DATA MANAGEMENTTRANSACTIONS COMPUTE SERVICES
Elastic Grid
Jobs
Printing
Integration
SYMAN
Update Transaction
Service (OTS)
Compressed
Data
Read Transaction
Service (RTS)
Compressed
Data
Data Cache
Instance Cache
Compressed
Data
4
23
1
4
PERSISTENCE

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In Figure 7, the Update Transaction Service (the same
mechanism that works for the Compute services) started
from the Instance Cache are kept up-to-date with “change
sets” corresponding to ongoing transactions issued
from the tenant’s Update Transaction Service (Step 1 in
Figure 7). Once a transaction is updated to the database
(Step 2) a change set is queued for consumption by the
Instance Cache and all other related live-tenant Compute
Services (Step 3). Before performing a requested report
or calculation process, any of the live-tenant Compute
services will check a version flag in the database to make
sure that it has the latest updates. If it is not up-to-date,
all queued change sets are applied before performing the
report or calculation. This process guarantees that the
information used by any of the services in the Compute
services is current up to the most recent transaction (Step 4).
While the Instance Cache safeguards the access of
transactional data and metadata, the DocStore Service
manages the storage and retrieval of unstructured data
stored in Basho Riak, a NoSQL data store. There is more
information on this process in the Persistence-layer
section of this paper.
For classes with many millions of instances, Workday
maintains a Query Service that works in combination
with the Instance, which allows us to do reporting
with drilldown to multiple dimensions over these large
datasets. This service is used heavily for reporting over
high-volume objects, such as financial journal lines. It
relies on an in-memory Search Index for performance.
Last, the Search service allows searching for terms
contained within Workday data data and on a set of
normalized search terms in SYMAN (SYstematic MAss
Normalization) to enhance the relevance of results for a
given search request.. For instance, look up “Jon” to find
workers named “Jon, Jones.”
Figure 8
SystemsUsers
Platform Services
COMMUNICATION & AUTH SERVICE DISCOVERY LOGGING & MONITORING
Zookeeper

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Platform
Platform services introduce a set of unique reusable and
generic components to be used within the Technology
layer. Among the services found in this layer, we find
functionality such as authentication and authorization,
communication, logging, monitoring, and customer-
landscape information. Regardless of the request coming
from a report, task in a browser or mobile client, or
integration, the same service is always relying on a single
source of truth. This process enforces application-behavior
consistency and also lowers management efforts and costs.
Service Discovery allows Workday to understand each
tenant’s available distributed compute services. As
described in the Technology section, each customer
always has Update Transaction Services, and as more
computing power is needed, additional Compute Services
are launched to respond to increased customer demand
and provide an optimal performance. When a new tenant
request comes in, Workday interacts with this service and
determine if it is possible to route it to an existing compute
service or if it needs to dynamically launch a new one.
This, in a nutshell, is how Workday’s infrastructure
dynamically scales out as demand increases.
The Auth Service centrally manages security. This
service helps enforce and secure access to data across
all Workday applications. This process contrasts with
systems that have been put together under a single
sign-on umbrella but still require several authorization
frameworks for different modules in a business suite.
The logging and monitoring services record the action of
every transaction so that it is always possible to audit
“who did what and when.”
Persistence
The services in the persistence layer manage access to
data used by Workday applications that requires a level
of persistence and time durability. Usually the data-
management set of services in the technology layer directly
interacts with the services in this architecture layer.
Figure 9
SystemsUsers
Persistence Services
TENANT DATA BLOBS BIG DATA
Basho Riak HDFSMySQL Server

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Workday does not rely exclusively on a relational
technology for persistence as it once did. While MySQL
is used for transactional data, unstructured data (such
as resumes, business-process documentation, and
photographs) are stored in Basho Riak. Workday selected
this technology for its capacity to scale to very large data
volumes and to replicate.
Workday’s platform also allows customers to upload
large external datasets to our cloud, which is stored in
a Hadoop file system. Workday selected Hadoop for its
ability to accommodate large volumes of data and for its
flexibility in handling data in any form. When external
data is correlated with data from Workday’s applications
the customer gets superior analysis and reporting.
There are several benefits to Workday’s approach
to storage:
1. Using a simplified schema to store transactional
data means that we do not have to manage schema
changes for all our customers when we release
new features and perform weekly upgrades.
2. Using Hadoop’s schema-less approach makes it
easier for customers to load their data into our
cloud. By not tying ourselves too closely to any
storage standard (such as SQL) we are able to
select the best storage technology for particular
storage needs.
As an example of these benefits, we changed the way
all transactions are stored, from inserts of multiple rows
relating to business object changes to combining all
changes in a BLOB data type stored with a single insert.
This optimization reduced the size on disk by more than
half. It also halved the time it takes to initially instantiate
data from disk into memory. This optimization would not
have been possible if we were performing SQL updates
against a complex schema.
Not being tied to one standard also keeps Workday
options open for switching to emerging storage
technologies without disrupting our customers or our
application developers. With innovation in storage
technologies at an all-time high, this storage architecture
ensures that Workday is continuously able to leverage
the best current approaches to storage. Martin Fowler, an
industry thought leader on object-oriented design, refers
to this approach as “Polyglot Persistence.”
Infrastructure
The Infrastructure layer of Workday’s architecture
deals with the typical aspects found on IaaS services.
To summarize its function in the overall architecture,
this layer is essentially Workday’s operating system.
Automation helps multiple services-provision servers
install the appropriate services on customer-specific
configurations, and make them available to a tenant as
part of instantiated compute services. Without a full end-
to-end, automated infrastructure-provisioning systems, it
would be impossible to scale dynamically at any time to
support current business demands.
When we designed and built Workday’s infrastructure,
Workday adopted a “scale out” architectural philosophy.
We increase storage capacity and enhance performance
by adding additional servers, storage, and networking,
rather than vertically upgrading to larger models or
appliances. Similarly, for our software architecture,
Workday scales application capacity through additional
services running on our infrastructure.
Scaling horizontally provides a number of benefits as
they relate to service availability. First, the servers are
redundant. Workday’s applications will not go offline
if one of our servers fails. Secondly, it is possible to
increase storage capacity without sacrificing performance.
Workday customers are assured that, as the infrastructure
layer scales to handle more data, they will not have
application-performance issues.

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Integration and User Experience
Two other important aspects of Workday have direct
correlation to Workday’s architecture: Integration and
User Experience. These have not come as an afterthought
and have always been native components of the platform.
Integration Services
Workday provides a lot of functionality with its business
applications, but customers often need to integrate with
third-party applications. For example, a very common
integration scenario in most of Workday implementations
is that Workday Human Capital Management integrates
with benefit providers. Integration with external systems
has never been easy. However, Workday provides multiple
alternatives to simplify connectivity to other systems.
Workday believes that web services are the best
approach for integrating applications. Workday
applications are built to automatically generate web
services for all tasks, allowing outbound and inbound
communication with other systems. However, as there is
no single, agreed-upon standard for how web services are
designed, Workday embeds enterprise service bus (ESB)
technology in our platform. These integration services
flexibly transform inbound and outbound data payloads
and vary the delivery protocol to meet the technical
specifications of third-party applications.
Integration services also enable our customers to build
their own integrations and to execute them in Workday’s
cloud. Workday accomplishes these integrations by
offering two tools that interact with Workday Web
Services Application Programming Interface (API),
Enterprise Interface Builder (EIB) and Workday Studio.
Figure 10
SystemsUsers
Infrastructure Services
AZ1
AZ2
SERVICES

15
• Enterprise Interface Builder (EIB): EIB allows
users to create simple, one-way in or one-way out
integrations using a forms-based user interface.
Once an “integration system” is built with this
tool, the customer can schedule execution of the
integration in Workday’s cloud.
• Workday Studio: Workday Studio is a powerful tool
that allows customers to build complex integrations
between Workday and one or more third-party
systems. The end result of Workday Studio is the
same as with EIB: an integration system that can be
scheduled to execute in Workday’s cloud.
These tools are included in the purchase of any Workday
application at no additional charge. Customers can always
interact directly with Workday’s public web services API
with the programming language of their choice. Workday
offers an open, standards-based API for programmatic
access to our business services. We provide three types
of API documentation:
• Public web services API: Workday offers an open,
standards-based API for programmatic access to
business services within Workday.
• Report-as-a-Service (RaaS): Workday enables
customers to build their own web services when
they create custom reports through our Report
Writer. Custom reports can be web-service enabled,
exposing the report as both a SOAP and REST-based
web service for integration.
• REST API: The Workday REST API is targeted for
applications that do small, typically self-service,
transactions initiated by users. Because a user
initiates the interaction, the REST API is designed
to quickly return a small set of frequently used
information for display or further action.
Figure 11
Cloud
Applications LDAP/AD
Beneﬁts
Providers
Payroll
Providers
On Premise
Applications
Workday Integration Cloud
Workday Cloud
Management and MonitoringConnectors and Toolkits
Workday Applications
Public Web Service APIs Custom APIs
Integration Cloud Platform

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There are several benefits to including integration
services as part of an application platform.
• The use of ESB technology to transform data
payloads and select the appropriate delivery
protocol makes Workday look like a more flexible
endpoint to all of the applications it connects to.
• Including tools with Workday applications
allows customers to decide which integrations
they want to run in our cloud. When customers
leverage our cloud, they lower the cost of building
and maintaining integrations that run on their
infrastructure.
• Integrations can be surfaced within the application
and seamlessly interact with a business process,
making integrations context-aware and configurable.
User Experience (UX)
Workday entirely separates the generation of its user
experience from the definition of its applications.
Application developers do not do pixel-perfect screen
layout, and they never specify where a given field
appears on a page. Instead, application developers define
the fields involved in a transaction. They specify how
the fields are grouped and how they are ordered. User
Experience Services generates the presentation of the
transaction from this information.
There are several user-experience benefits to this
approach. A generated UX provides consistency. Workday
does not have to teach and coordinate hundreds of
developers to lay out their pages in the same way.
Separation of the UX from the definition of the
application allows Workday to change UX technologies
without changing our application.
Workday’s browser presentation layer is currently HTML
5. This is the third browser UI technology that Workday
has embraced (after DHTML and Flash). Workday believes
that UI technology will continue to change faster than
applications change. So, our architecture allows us to
stay current by changing our presentation frequently.
The mobile experience has taught us that the UX gets
stale if its design is not refreshed every other year, at a
minimum. The same is true for the browser.
Figure 12

17
Mobile
Mobile access is a foundational feature of modern
applications, not a separate product or platform. With
Workday, mobile access is simply another aspect of
User Experience Services and is included as a part of
every application.
In addition to desktop-browser access, Workday
applications can be used on a native iPhone, iPad, or
Android client, or any modern mobile browser. Each
client’s user experience is optimized based on touch and
form factors, so the user never has to pinch and zoom
to find fields or buttons meant for the real estate of a
desktop browser. Native mobile applications offer optimal
usability. Workday passionately supports native clients
in conjunction with making our HTML5-browser client
completely responsive to the tablet and phone feature-set
and form factors.
Because Workday’s mobile solution is simply an extension
of the application, mobile users are accessing the same
data, business logic, and functionality as they do on a
desktop. For example, a dashboard built on the desktop
can be accessed and modified on any mobile device, with
no data persisted on the device. What’s more, Workday
has designed its mobile clients to utilize the same single-
security model that customers establish for browser
access. This allows customers to easily implement
Workday’s mobile solutions. The only set up (other than
downloading the app) is to grant all appropriate users the
ability to use mobile devices to access Workday.
Workday is committed to delivering frequent updates
while keeping our customers current on the latest
version. This commitment influenced many of Workday’s
design choices for our platform architecture. It also led
us to reconsider development processes as they relate to
both products and platform as well as an infrastructure.
Workday embraces continuous deployment of new
product and platform functionality on a single code
line. This approach is the only way to support ongoing
delivery of many new features to our growing customer
base. Workday developers work in small scrum teams.
These teams work in an agile manner. They own design,
development, and quality, and they iterate to create
features ready for production.
Once a feature has passed through the test pipeline, it is
checked into the production code line. Software switches
called toggles are used to determine whether each feature
is viewable only to development, to customers in a
preview mode, or to customers in production. Supporting
our ability to work on a single code line is a large,
automated test infrastructure.
Workday has also developed a process for converting
customer data in the background as new features are
checked in. This approach dramatically changes the work
our environments and infrastructure teams perform on
the day of an update. Instead of moving to a new code
line and running conversion processes for all customers
on a single day, an update involves simply switching the
new features from preview mode to production.
Figure 13

18
A second benefit of organizing around scrum teams
is increased cradle-to-grave ownership of services.
Our scrum teams own the development, deployment,
and monitoring of identifiable runtime services. This
enhances Workday’s overall service delivery and our
responsiveness to our customers.
Workday believes that our datacenter infrastructure
is just another system that needs to be continuously
enhanced as we expand our products and our customer
base. For that reason, infrastructure is a part of the
development organization and Dev-Ops projects are
a part of every new Workday update. Increasingly,
technology makes it possible to treat the datacenter
as another software resource. Workday makes an
ongoing investment to increase automation of services
and virtualization of compute and networking services
to more efficiently allocate and share infrastructure
resources for a growing set of customers.
Conclusion: Embracing Continuous Change
Workday took advantage of being able to start with a
“clean sheet of paper” at its founding in 2005. We took
a fresh approach to technology in response to unmet
requirements for enterprise applications. The early
decisions we embraced were:
• Object-oriented (as opposed to relational) design of
applications
• Definitional, metadata development (as opposed to
coding)
• Application data available in memory
• Generated user experience
These guidelines have allowed Workday developers to
focus on business-logic development without having
to be concerned about in-memory data management,
persistence, or UI technology. The business logic itself is
not tied to a specific underlying technology (such as SQL,
HTML, or JavaScript). This cleanly separates the business
logic that defines our applications from the technology
platform that runs them and allows us to develop the
applications and the technology platform independently,
without breaking one another.
When Workday was launched, our architecture could be
described with this simple picture:
Figure 14
Customer Site Workday Data Center
Users
Systems
Internet
XML
XML/Files
Workday Services Architecture
XML
XML
Persistent Store
Object
Management
Services
(OMS)
Integration
Server
UI
ServerInternet
Browser
Data
Services

19
Over the years, Workday has stayed true to its early
architectural decision while continuously evolving the
implementation of our architecture. Today’s picture is a
bit more sophisticated.
Workday firmly believes that to deliver applications that
are continuously relevant and modern for our customers,
it must embrace continuous change at all levels.
Workday is able to support the ongoing configurations
and customizations that our customers make to their
implementations of our products. Workday is also able
to continuously deliver new functionality that customers
can adopt without expensive upgrade projects. And, while
all this is happening, Workday is able to continuously
innovate, refreshing the implementations of our
architecture the implementations of our architecture.
Our belief is that enterprise applications need to become
more like consumer-Internet sites, such as Facebook,
Amazon, or Netflix. These sites are sophisticated
applications that are updated continuously. Customers of
these sites are not aware of the details of the infrastructure,
but they expect a beautiful end product. Similarly,
customers do not need to know what version of the site
they are on because there is only the current version.
Workday’s architecture and development processes
are designed to make the experience of using our
applications similar to using one of the big consumer-
internet applications. Workday is committed to being
able to continuously change our applications and our
platform, to support our customers while they achieve
their business goals.
Figure 15
SystemsUsers
Workday Cloud
PERSISTENCE
BIG DATA
HDFS
BLOBS
Basho Riak
TENANT DATA
MySQL Server
TnT1 T2
. . .
TS-Transaction
Service
TRANSACTIONS DATA MANAGEMENT COMPUTE SERVICES
Integration
SYMAN
Elastic
Grid
Jobs
Printing
Insight
Data Cache
Doc Store
Query
Service
Search
Service
Update TS
(T1, T2, T3)
Update TS
(Tm)
Read TS
(Tx)
Read TS
(Tx)
REQUESTS
User Interface
Gateway
Integration
Gateway
PLATFORMS
EMS KMI Auth Chef MsgQ Stats MonitorZookeeper

Workday, Inc. | 6230 Stoneridge Mall Road | Pleasanton, CA 94588 | United States
1.925.951.9000 | 1.877.WORKDAY (1.877.967.5329) | Fax: 1.925.951.9001 | www.workday.com
© 2015. Workday, Inc. All rights reserved. Workday and the Workday logo are registered trademarks of Workday, Inc. All other brand and product names are trademarks
or registered trademarks of their respective holders. 20150821TECHPLTFMDEVPRCSS-ENUS

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