Mikita Kavaliou

Led the migration of a legacy PHP monolith to a modern stack (Node.js, Angular, React, NestJS, Prisma, Redis), supporting peaks of 1200 requests per second (RPS) with AWS auto-scaling ensuring 99.95% availability. Radically optimized Frontend performance (Zustand, TanStack Query) by eliminating superfluous re-renders, resulting in a 30% reduction in loading time and boosting conversion by 5% for over 200k active users. Drove the transition to TypeScript and Clean Architecture for a team of 3 developers. Deployed an E2E testing suite (Playwright) covering 80% of critical paths, reducing regressions by 35% and accelerating code reviews by 40%.

Designed and deployed complex architectures as a Solo Architect or integrated with internal teams. (Fitness SaaS Platform): Architected an interactive marketplace (Angular, React, Node.js, Leaflet, Tailwind CSS) connecting sports coaches and clients. Implemented secure payments via Stripe Connect with strict PCI-DSS compliance. (AI EdTech): Developed a GDPR-compliant secure AI platform with RAG LLM, achieving a Time-To-First-Token (TTFT) under 200ms and 99.9% availability. Integrated Speech-to-Text functionality.

Designed and deployed scalable microservices (Node.js/PostgreSQL) for Enterprise applications (handling over 50k requests/day), eliminating legacy bottlenecks and ensuring continuous, interruption-free production deployments. Standardized code reviews via a structured checklist, reducing review time by 25% and limiting post-merge returns to less than 2 per sprint, thus accelerating overall delivery cycles by 20%.