• Building and maintaining multiple backend microservices for mobile games.
• Designing microservice architecture for new features, for a highly scalable system.
• Being responsible for the whole software development process - from design and building from scratch to production release.
• Building services using Java 18, Spring Boot, Hibernate, PostgreSQL, Kafka.
• Working with AWS cloud environment and integrating with AWS stack tools.

• Built and designed new microservice for initiating payments.
• Prepared migration to new payments microservice from existing monolith system.
• Built and maintained system that integrates with banks’ APIs and fetches consumers’ data.
• Analysed documented and undocumented APIs, analysed business cases for integrations.
• Reverse-engineered mobile apps API flows, for recreating in the system.

• Designed custom microservices architecture for the new carsharing system.
• Implemented new functionalities from the ground up - including services like API gateway and security.
• Built Java services using AWS stack (SNS, SQS, EC2, CodeCommit, CodeBuild, CodePipeline, Cognito, RDS, Lambdas, DynamoDb, S3, etc.).
• Designed system able to process high traffic load as it was expected to process a lot of users, and process live data from cars.
• Cooperated with the devops team while building development environments.
• Cooperated with the product team, analysed and documented business requirements.
• Built the team and coordinated backend work.

Java backend development and maintenance - requirement analysis, designing solutions, system integration. For 6 months also a backend leader. Worked on multiple projects - mostly Java + Spring + Hibernate + PostgreSQL.