Ashish Sharma, SS&C Eze - SS&C Eze provides various products in the stock market domain. We spent the last couple of years building Eclipse which is an investment suite born in cloud. The journey so far has been very interesting. The very first version of the product were a bunch of monolithic windows services and deployed using Octopus tool. We successfully managed to bring all the monolithic problem to the cloud and created a nightmare for ourselves. We then started applying microservices architecture principles and started breaking the monolithic into small services. Very soon we realized that we need a better packaging/deployment tool. Docker looked like a magical solution to our problem. Since its adoption, It has not only solved the deployment problem for us but has made a deep impact on different aspects of SDLC. It allowed us to use heterogeneous technology stacks, simplified development environment setup, simplified our testing strategy, improved our speed of delivery, and made our developers more productive. In this talk I would like to share our experience of using Docker and its positive impact on our SDLC.

1. Ashish Sharma
Monolithic to Microservices +
Docker = SDLC on Steroids
Director SWE, SS&C Eze.
@asharma_im

2. About SS&C Eze
1,900Asset managers served
worldwide
25years delivering investment
management solutions
$40m+Annual R&D Investment
1050+
Employees
44%
Service
36%
R&D

3. Eze Eclipse
Data Integration
Prime Brokers
Administrators
Trade Execution
High-Touch Desk
Algorithms
Outsourced Trading
Desks

4. Tech Stack
Agenda
Developer
Experience
Testing Delivery

5. Tech Stack

6. Idea!
Innovators
Let's build a cloud native
Investment Suite!

7. Tech Stack 1.0
● Front End SPA in Angular
● ~12 Backend services in C#
● RMQ & Nginx based messaging
● MSSql Server for storage

8. Tech Stack 2.0

9. Polyglot Stack

10. Eclipse Infrastructure
Uniform Packaging Identical multistage environments
TEST PERF UAT PROD
Dynamic scaling
Simplified CI/CD tool chain

12. Standardization
Language/Framework agnostic standards and patterns
Bootstrapping
● Secrets management
● Configuration
Resource Access
● DB/Cache Access
● Authentication
● Authorization
● Logging and Tracing
APIs Boundary
● API Standards
● Swagger
● Contract driven
development

13. Developer Experience

14. Come to
office
Download
Code
Build
Restore DB/Register
Services/Configuration
Work on
Story
Monolithic Developer Experience:
Less than Ideal

15. Come to
office
Download
Code
docker-compose up
Work on
Story
Microservices Developer Experience

17. Self Contained Code
● Mono repo to micro repos
● Explicit dependencies, build
tools, tests and packaging
● It works the same way in local,
test, UAT and PROD

18. • Quick to onboard new developers
• Massive increase in cross team pull requests!
Onboarding

19. • Quick to onboard new developers
• Massive increase in cross team pull requests!
Onboarding
What happened Team-
A?

20. • Quick to onboard new developers
• Massive increase in cross team pull requests!
Onboarding
Team-A contributing into
Team-B’s repo

21. Testing

22. Service Tests
● Setup dependent services and data
● Environment reliability
● Slow
● Cleanup
Resource-1…………………….Resource-n
Service Tests
Unit Tests
Wouldn’t it be nice
if service tests
were as easy as
unit tests

23. Test Data
● Web crawler inspired technique to download
snapshots from immediate dependencies
● Snapshots are served as mock during test run
● Snapshots are checked into source control

24. Test Suite
Mock
DB
Test Client Service

26. Easy to write
Fast
Consistent
Coverage Report
Cleanup
Triggers on every check-in
Unit Tests Service Tests
Service Tests
Now as Easy as Unit Tests

27. Chaos Tests
MockTest Client Service
X-Request-Id = “/price return 500” Propagate headers
If X-Request-Id == “/price return 500”
→ set res.status = 500

28. Delivery

29. Delivery
Weekend Deployments
Extended Downtime
Painful Rollbacks
Multiple Deployments per day
Zero Down Time
Easy Rollbacks

30. Deployments

31. Patterns for Safe Delivery
Branch by abstraction
● Dark launch
● Feature Toggles
V1 V2
Clone Input
Workflow
Compare Results
Performance stats
V1 V2
Get Toggle
Workflow
ONOff

32. KEY TAKEAWAYS
Microservices with polyglot stacks are magical
but requires strict engineering discipline
Invest into making developer experience quick
and smooth
Shift Left. Test services in Isolation
Apply standard patterns for Safe Delivery

33. Thank you!