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Engineered the backend architecture of a web platform designed to automate document processing for seafarers and centralize crew personal data management, serving millions of users worldwide. Delivered a secure and scalable solution enabling maritime agencies and shipowners to instantly create, complete, and store contracts, certificates, visas, and other critical documents. Developed APIs providing profile of each seafarer, including work history, qualifications, medical examinations, and document expiration tracking. Designed and optimized PostgreSQL schemas to handle large datasets with high query performance. Built high-performance REST and gRPC services using Gin and sqlx, ensuring low-latency data exchange. Integrated JSON and Protobuf serialization for efficient microservice communication. Implemented centralized logging and metrics with Zap and Prometheus for real-time system monitoring. Containerized services with Docker, enabling consistent deployments across environments. Ensured code reliability with unit and integration tests using Testify.