By leveraging Hibernate and Spring JPA in Spring Boot with Java-Kotlin and a Postgresql database, we have developed high-performance REST API services. Maintained some legacy endpoints to have 100-320 by decreasing their response time by 20%. Additionally, we have implemented AWS SQS along with polling and webhook mechanisms, resulting in a more enhanced experience.Increased test coverage by over 75% for legacy services and implemented over 90% coverage for new services by employing Test Containers and Junit. Implemented a backend module for accounting that works with an external service named Codat. Developed a comprehensive system that combines pay items based on more than 20 parameters, resulting in extensive possibilities. Developed over 50 endpoints with less than 150 ms response time for this feature.

The company works on B2B products namely remote debugging, CI/CD monitoring, and Application Performance Monitoring, catering to diverse platforms.Maintained CI/CD of products by using a variety of deployment tools, such as AWS-CDK, AWS-SAM, Docker, Serverless, and GitHub Actions. As these products utilize multiple technologies, gained proficiency in various programming languages, including JavaScript with Node.js, Python with Flask and Django, and Java with Spring Boot.