Saveli Mussijenko

Developed and maintained core e-commerce and warehouse management features using PHP, Smarty, and JavaScript. Optimized SQL queries and implemented Redis caching to improve platform stability and load times. Collaborated with warehouse staff to digitize and optimize internal workflows, reducing manual processing steps. Refactored legacy codebase to align with modern code style standards and improved site reliability. Participated in sprint planning, feature testing, and provided production troubleshooting and support.

Developed and maintained high-performance backend microservices in Go within a distributed architecture (52+ microservices). Designed and integrated gRPC-based internal services for fast, strongly typed inter-service communication. Implemented asynchronous event processing using AWS SQS and integrated Redis for caching and session storage. Optimized PostgreSQL queries and service logic to reduce database load and improve response times. Wrote unit and automation tests, participated in Architecture Decision Records (ADRs), and worked closely with QA and product teams in Scrum sprints.

Developed and maintained high-performance backend microservices in Go within a distributed architecture (52+ microservices). Designed and integrated gRPC-based internal services for fast, strongly-typed inter-service communication. Implemented asynchronous event processing using AWS SQS and integrated Redis for caching and session storage. Optimized PostgreSQL queries and service logic to reduce database load and improve response times. Wrote unit and automation tests, participated in Architecture Decision Records (ADRs), and worked closely with QA and Product teams in Scrum sprints.