Karthik K S

NagraVision India Private Limited[Sept-2021 - Present]

Project: Nagra{-=-=-}

• Independently designed & implemented Server Sent Events feature from Backend & Infrastructure side as per requirement.
  • Implemented solution using redis pub-sub to push events to clients even when server scales up horizontally(Client receives event from server it is connected to even when the event is triggered in different server pod)
  • Written two implementations to handle events to work with & without redis. (to avoid costs in development environments)
  • Had proposed new microservice called event-service responsible for mainly sending different kinds of events to clients and it's communication with main monolith server. How to route requests to it using ALB.
  • Written module test cases to verify events are pushed to clients on trigger.
  • Even found out fault in the golang library used by embedded team for development & suggested working library.
• Implemented generic global exception handling logic to catch exceptions(even new exceptions that will be added in future) & return internal error code instead of default spring error response with correct http status
• Wrote code to dynamically generate html table which explains the meaning of internal error codes(handles addition of new error code without code change) & embed it inside Swagger documentation.
• Worked on terraform configuration to disable elasticache resource creation & Configured spring application server to work with or without redis.
• Implemented solution to block external known client with valid token from accessing our server APIs except few which it is allowed to access.
• Created aws lambda to create different database credentials on environment creation & configure them in different services with terraform code.
• Proposed simplified & easily understandable solution to complex business feature(M__ random______) and implemented solution with module test cases. Module test cases written were of better quality than existing module test cases & focussed on code reusability.
• Built from scratch a python tool to stress backend server which was used by operations team to perform performance tests. Provided solution to run multiple containers of them on same ubuntu instance & control them using python script.
• UI work: Worked on improving styling & functionalities of spring-mvc & thymeleaf based dashboard application.
• Implemented cognito Userpool migration lambda to support case insensitivity.
• Had identified cause of high response time of most called API. And refactored code by removing extra loops & fetching only required data. Also indexed column as suggested by Senior Developer.
• JFrog Integration:
  • Independently Worked on JFrog integration in project CI/CD pipeline to manage packages.
  • Assisted Tools Team member to create correct type of repositories for our projects by going through Jfrog documentation & tutorials myself.
• Worked on SonarQube integration in our java applications
  • Independently listed requirements of our project & communicated with Other Team who manages Sonar projects.
  • Fixed few critical/blocker issues.
  • Documented steps to setup SonarQube locally so that new issues can be avoided during development phase
  • Written script that runs after sonar analysis & sends result in email to team members.
• Identified incorrectness in existing code(Feature-1, Feature-2) & fixed it(Feature-1).
  
• Independently worked on breakdown of an existing feature in monolith service into a microservice by taking requirement.
  • Analyzed existing dashboard feature & old code and explained the PO & Architect about its working using Flow Diagram & Discussed how i'm going to implement the solution based on thier expectation which helped then to create user stories.
  • Created spring webflux project with some improvement to serve rest response & html views. Had used latest spring features.
  • Configured security configuration to achieve single-sign-on.
    [Had explained multiple solutions(shared session using spring-redis, path based routing using SpringCloudGateway/ALB & subdomain) to achieve single-sign-on features & thier limitations ]
  • Configured service to connect to both Redshift & Postgres data sources.
  • Updated infra code to deploy the new microservice & configured path based routing for the service
• Sprint activities also involves Bug fixing, Application Deployments, Supporting App, Embedded & QA teams.
• I also help other team members even seniors regarding technical & project related work.(Not just take help)
• Created APIs as per specification defined by Architect. Also used to provide feedback based on my analysis.
• • Had got opportunity to directly communicate with other company people regarding their new API integration.
  • After verifying new API, informed them & our Architect about concerns related to API authorization & response. Explained high-level implementation of existing feature(not done by me) which uses the their old API. Feedback provided by me helped Architect to have discussion with other company members on API contract.
• UI work:
  • Updated dashboard reports to show different views based on user role & minimal modification to backend API to work with both views.
  • Added input validations & other improvements which were not told as requirements.

Happiest Minds Technologies[Jan 2019 – Sept 2021]

Project: Savvas-Realize (Pearson Schools)(Aug-2019 - Sept-2021)

• Worked in multiple backend services & frontend applications as per client requirement.
• Worked in all phases of software development from analyzing requirements, Implementing features with unit test cases, testing, identifying root cause & fixing bugs.
• Involved in migration of monolith applications into micro-frontends & backend-for-frontends.
• Designing & implementing REST & GraphQL APIs.
• Implemented Angular components.
• Have experience in integrating external services & tools.
• Wrote scripts to migrate data & configured caching & AWS services like SNS & SQS.

Project: HM internal Projects (Feb 2019 – Jul 2019)

• Worked in two internal web applications which are being used by management & employees. Was involved in enhancing, implementing & testing features such as
  • Scheduling emails to employees.
  • created UI components & Jasper reports
  • Employee data migration using spring batch job.
  • Support & bug fixing