0xrazumovsky

Developed and supported backend services using Node.js and TypeScript for high-load internal and user-facing systems. Designed API contracts REST/JSON, ensured backward compatibility and version control. Implemented strong typing and eliminated implicit states (undefined, invalid responses), reducing runtime errors. Implemented input validation and centralized error handling. Optimized the business logic of critical endpoints, reducing latency and unnecessary database calls. Worked with asynchronous processes: queues, background tasks, retries, idempotency. Designed code with edge cases and failures in mind (partial errors, timeouts, unavailable dependencies). Wrote unit and integration tests, covering key business logic. Participated in code reviews, improving the readability and predictability of the team's code. Worked with logging and metrics, participated in incident analysis. Maintained and developed existing legacy code without degrading the service's stability. Interacted with the product and other teams to develop requirements and technical constraints.