This is a sample case study that may be used on the Professional Cloud Architect
exam. It describes a fictitious business and solution concept to
provide additional context to exam questions.
Dress4Win Case Study
Dress4win is a web-based company that helps their users organize and manage their
personal wardrobe using a website and mobile application. The company also
cultivates an active social network that connects their users with designers and
retailers. They monetize their services through advertising, e-commerce, referrals,
and a freemium app model.
Dress4win’s application has grown from a few servers in the founder’s garage to
several hundred servers and appliances in a colocated data center. However, the
capacity of their infrastructure is now insufficient for the application’s rapid
growth. Because of this growth and the company’s desire to innovate faster,
Dress4win is committing to a full migration to a public cloud.
For the first phase of their migration to the cloud, Dress4win is considering
moving their development and test environments. They are also considering building
a disaster recovery site, because their current infrastructure is at a single
location. They are not sure which components of their architecture they can migrate
as is and which components they need to change before migrating them.
Existing Technical Environment
The Dress4win application is served out of a single data center location.
- MySQL - user data, inventory, static data
- Redis - metadata, social graph, caching
- Application servers:
- Tomcat - Java micro-services
- Nginx - static content
- Apache Beam - Batch processing
- Storage appliances:
- iSCSI for VM hosts
- Fiber channel SAN - MySQL databases
- NAS - image storage, logs, backups
- Apache Hadoop/Spark servers:
- Data analysis
- Real-time trending calculations
- MQ servers:
- Social notifications
- Miscellaneous servers:
- Jenkins, monitoring, bastion hosts, security scanners
- Build a reliable and reproducible environment with scaled parity of production.
- Improve security by defining and adhering to a set of security and Identity and
Access Management (IAM) best practices for cloud.
- Improve business agility and speed of innovation through rapid provisioning of
- Analyze and optimize architecture for performance in the cloud.
- Migrate fully to the cloud if all other requirements are met.
- Evaluate and choose an automation framework for provisioning resources in
- Support failover of the production environment to cloud during an emergency.
- Identify production services that can migrate to cloud to save capacity.
- Use managed services whenever possible.
- Encrypt data on the wire and at rest.
- Support multiple VPN connections between the production data center and cloud
Our investors are concerned about our ability to scale and contain costs with our
current infrastructure. They are also concerned that a new competitor could use a
public cloud platform to offset their up-front investment and freeing them to focus
on developing better features.
We have invested heavily in the current infrastructure, but much of the equipment
is approaching the end of its useful life. We are consistently waiting weeks for
new gear to be racked before we can start new projects. Our traffic patterns are
highest in the mornings and weekend evenings; during other times, 80% of our
capacity is sitting idle.
Our capital expenditure is now exceeding our quarterly projections. Migrating to
the cloud will likely cause an initial increase in spending, but we expect to fully
transition before our next hardware refresh cycle. Our total cost of ownership
(TCO) analysis over the next 5 years puts a cloud strategy between 30 to 50% lower
than our current model.
< Back to Professional Cloud Architect Exam