Kirill S

Full-Stack Engineer

Owned the project across the stack: led a 3-person frontend team (roadmap, architecture, coding standards, 70% hands-on coding) while designing backend authorization logic and system architecture from scratch)

• Designed permission synchronization with SpiceDB (relationship-writing use cases, DI wiring), streamlining the RBAC system and reducing database errors by 20%
• Refactored backend I/O handling: moved CPU-bound operations (image resizing, HEIC decoding) and blocking calls off the event loop, adding an asyncio.Semaphore to prevent thread-pool exhaustion under load.
• Tuned RabbitMQ consumer concurrency to smooth CPU/RAM peaks during backlog processin
• Enhanced global search with TanStack Query caching and debounce on the frontend, achieving 25% faster load times and 40% higher user satisfaction
• Designed and maintained CI/CD pipelines with Lighthouse and Core Web Vitals monitoring, proactively pre- venting performance regressions and reducing production issues by 15%.

Middle Full-Stack Engineer

Built adaptive dashboards from scratch (React, TypeScript, Tailwind) and the Node.js backend they connect to, automating reporting and saving 40+ hours per month

• Wrapped the PWA into native Android/iOS builds with Capacitor, handling platform-specific configuration and permissions; managed the release cycle for Google Play and the App Store, including version/build number bumps and building and submitting APK/AAB and IPA packages for each release.
• Integrated real-time push notifications with Capacitor + FCM and offline queuing, cutting inspection response time by 50%
• Refactored UI components into a reusable library with i18n support, accelerating feature delivery by 30%
• Applied unit and integration testing with Jest, achieving 90% coverage and minimizing post-release bug
• Optimized API calls with TanStack Query caching, improving dashboard load time by 25%.

Frontend Mentor (Part-time)

Mentored 200+ students in React, JavaScript, and frontend fundamentals, increasing project completion rate by 70%

• Developed interactive teaching materials and coding exercises, improving student engagement by 50%.
• Guided students in building 10+ real-world applications, preparing 70% for industry placement.

Frontend Software Engineer (Middle/Junior+)

Delivered full-stack web applications from concept to production using React, improving client workflows by 20–30%

• Redesigned internal UIs and optimized task flows, increasing employee efficiency and client satisfaction.
• Implemented structured documentation and team processes, reducing release cycles by 40%

Frontend Developer / Training Programs

Created responsive CV capstone project with React, TypeScript, and Jest, demonstrating production-grade frontend skills. Mentored junior students, improving skill adoption and successful project completion rates by 70%