Middle Backend Engineer Agentapp, Saint Petersburg
Provided support and development for 7 projects, fully responsible for backend development, maintenance, and optimization. Developed monolithic system core on Django/Django REST Framework and microservice architecture on FastAPI and Starlette. Implemented new business logic and performed large-scale refactoring. Developed and maintained JSON and SOAP API integrations with third-party and internal services including billing, acquiring, government services, and electronic signature services. Optimized slow SQL queries, reports, and API endpoints, improving system performance. Updated CI/CD pipelines (GitLab CI, Bitbucket Pipelines). Performed labor cost estimation, planning, and task decomposition within sprints. Conducted onboarding and mentoring sessions for new developers. Configured and refined monitoring and alerting systems. Described architecture and decomposed features to simplify development. Configured nginx, docker-compose, and optimized application server resources. Participated in refactoring and technical recovery of legacy code. Developed Telegram bots with integrated payments, reporting, and user accounts. Increased speed of individual services by up to 15 times through optimization and monitoring.