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Vitalikdeve/README.md

Hi there, I'm Vitali Zelianko 👋

Full-Stack Developer · AI Products · SaaS Engineering

Focus Code Quality


🚀 About Me

I build production web applications, AI orchestration tools, and distributed file processing systems. I focus on clean TypeScript architectures, practical test automation, and reliable cloud backends.

  • 🔭 Current Project: Building ResumeAI — an AI-powered career platform with multilingual ATS analysis.
  • 🛠️ Engineering Approach: Resilience patterns (circuit breakers, exponential backoff), automated testing (Playwright E2E & Vitest), and database-level security (Supabase RLS).
  • 🌐 Specialties: Multi-provider LLM failover, streaming data pipelines, file transformation (FFmpeg, OCR, PDF), and cross-platform web/mobile development.

🛠️ Technologies I Work With

Area Tools & Technologies
Frontend Next.js 15/16 (App Router) · React 18/19 · TypeScript · TailwindCSS · Zustand · Framer Motion · Radix UI
Backend & Data Node.js · Next.js Server Actions / API · Supabase (SSR, Edge Functions) · PostgreSQL · Redis / BullMQ · Vercel
AI Systems Google Gemini API · OpenAI API · Mistral AI · Structured Outputs (Zod) · Failover Cascades · SSE Streaming
Mobile Capacitor 8 (Android runtime) · PWA / Service Workers (Serwist)
Media & Files PDF.js · React-PDF · Mammoth · FFmpeg · Tesseract OCR · Chunked Streaming
Testing & CI Playwright (E2E) · Vitest · Testing Library · GitHub Actions · ESLint / Prettier
Security & Auth Supabase Auth (OAuth, Apple, Google) · Row-Level Security (RLS) · Cloudflare Turnstile · Zod Validation

🏆 Projects & Technical Case Studies

Stack: Next.js · TypeScript · Supabase · PostgreSQL · Gemini/Mistral · Playwright · Capacitor Android
In-depth 10-part technical whitepaper detailing the architecture of a production AI SaaS: multi-model cascade routing, dual-mode PDF compilation, build-time i18n key parity checks, and zero-trust RLS multi-tenancy.

Stack: TypeScript · Vitest · GitHub Actions · MIT License
Lightweight TypeScript toolkit for resilient AI systems: multi-provider failover cascades, circuit breakers for rate-limited endpoints, exponential backoff with full jitter, cancellation via AbortSignal, and token cost telemetry.

Stack: Node.js · Express/Fastify · Redis · BullMQ · Docker · FFmpeg · Tesseract OCR
Asynchronous distributed file transformation platform featuring containerized worker sandboxing, real-time WebSocket progress telemetry, and batch media transcoding.

Stack: TypeScript · WebSockets · Chunked Streaming · Docker Compose
Resilient file transfer platform with deterministic chunk hashing, automatic resumable sessions, and stream disk buffering.


📈 Engineering Focus & Standards

  • 🔒 Data Isolation: Enforced PostgreSQL Row-Level Security (RLS) on all multi-tenant tables.
  • 🧪 Test Automation: Continuous CI pipelines running unit tests and Playwright browser suites.
  • Practical Performance: On-demand dynamic module loading and non-blocking background task queues.

📬 Connect With Me

GitHub Email

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