tilek

Top-rated Upwork outsourcing agency delivering SaaS and custom web applications. Led a team of 3 developers and QA across multiple concurrent projects; owned architecture decisions, sprint planning, and client communication. Designed and built REST APIs and real-time features with WebSockets; introduced CI/CD pipelines with GitLab and Docker, significantly cutting deployment times. Refactored legacy codebases into maintainable modular architecture; optimized PostgreSQL queries and introduced Redis caching. Co-developed a Stripe-based recurring payment service handling premium subscription flows. Mentored junior engineers through code reviews and pair programming; drove consistent improvement in code quality across the team.

Shopify marketing platform serving 13,000+ brands. Built and maintained React-based UI and Shopify extensions; co-developed TikTok video integration feature. Led frontend performance improvements and resolved complex UI and data flow issues; collaborated across backend and product teams on feature delivery and code reviews.

Built REST APIs and real-time WebSocket channels for client projects across various verticals; optimized large PostgreSQL queries and implemented caching at DB and presentation layers. Set up CI pipelines (Jenkins, TeamCity); managed 2 developers and 1 QA engineer; worked directly with clients on requirements and delivery planning.