Interface rewriting in an agile way

Back in February, one of our clients came to us with an urgent issue. As the customer stated, they had a backend-sided system having multiple instances operating on a 24/7 basis. However, problems have occurred recently due to the raised number of the transactions, the existing system had occasionally data inconsistency and reach very high operating costs.

We agreed that we would help them with reshaping the existing application. Firstly, we examined the existing codebase, then, based on our estimation, we planned the Backlog and the Sprint timeframes. Our approach was to create a stateless solution based on the original codebase, improve the quality and reduce the response latency of the service.

Overall we planed 3 Sprints (2 weeks as 1 Sprint) for the project. Fortunately, we finalized the project with one more sprint focusing on some glitches and to the complete the third-party integration and testing.

We felt quite proud as we tackled several challenges through the project with success like minimally documented codebase, third-party library components, non-common web service implementation, or using unimplemented external resources.


Some facts and results from the project:

Technology stack change:

  • Java 7 -> Java 8
  • Apache Tomee -> Java Spring Boot
  • Applied Microservice Architecture (Get to know this Tech here)

Applied changes:

  • Code refactoring
  • Changed data structure
  • Changed REST API
  • Removed obsolete Jack Rabit
  • Applied CI in DEV environment
  • Automated component and E2E tests

Used techs and solutions:

  • Docker (Get to know this Tech here)
  • SonarQube
  • GitLab CI
  • Confluence
  • SOAP UI for Rest tests and service mocks
  • SpringBoot
  • Swagger and Javadoc for documentation

What are we proud of:

  • We delivered the solution for 8 weeks!
  • We managed changes in the Agile way!
  • We increased our customer satisfaction and happiness!
  • Community added values: Github model mapper bugfix!

You can read our success story in Test Automation project here.

Should you have any further requests, please feel free to drop us an email!

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