Ester B.

Responsibilities:

• Implemented a development-optimized Docker architecture using Hot Reload, volume-mounted source code, and strict Dev/Prod configuration separation via compose overrides, ensuring fast iteration cycles without compromising production integrity.

• Constructed a full multi-service Docker Compose environment integrating Kafka, Zookeeper, PostgreSQL, multiple microservices, and Kafdrop, providing deterministic local orchestration and consistent development environments for the entire team.

• Adopted Contract-Driven Development using a centralized OpenAPI specification and automated code generation, establishing a unified API contract and consistent cross-service communication across all microservices.

• Designed a scalable Generic Kafka Consumer using a TopicHandlerMap abstraction with DI-driven handler discovery, enabling plug-and-play message processors and eliminating duplicated topic-specific consumer code.

• Engineered a resource-safe Worker Service by applying a Scoped DbContext Factory Pattern within a long-running HostedService, ensuring proper lifetime management, clean disposal, and stable PostgreSQL connectivity under load.

• Migrated raw SQL logic to TypeORM entities and repositories, improving maintainability, enforcing schema consistency, and mitigating SQL injection risks through parameterized and type-safe data-access patterns.

• Orchestrated a complete end-to-end workflow—from UI and Gateway to NestJS, Kafka pipelines, the .NET worker, and read/write PostgreSQL stores—achieving consistent cross-service data propagation and reliable system state synchronization.

• Implemented a centralized Global Exception Filter in NestJS with structured error responses, enhancing observability, resilience, and debuggability across distributed HTTP and event-driven interfaces.

• Automated regression detection using Git Bisect paired with a custom test script, enabling rapid pinpointing of faulty commits and dramatically accelerating troubleshooting across complex merge histories.

• Developed a professional automated testing suite using xUnit, Moq, and SQLite In-Memory to validate domain logic, data-access constraints, and edge cases with high-fidelity verification of repository behavior.