Core competencies
Frontend Engineering:
Redux, Zustand, TanStack Query, Tailwind CSS, shadcn/ui, Zod, Ant Design, Responsive Design, Auth (JWT/OAuth), Lazy Loading, Memoization, i18n (Multi-language)
System Architecture:
Microservices, RESTful API, Event-driven, API Gateway, Load Balancing, Multi-tenant Architecture, Caching (Redis), Queue Processing
DevOps & Infrastructure:
Docker / Compose, Multi-stage Build, Ubuntu Server, Systemd, SSH Hardening, Firewall, HAProxy, Nginx LB, Caddy, VPN / Tailscale
Cloud & Hosting:
VPS Management, Self-hosted Infra, Cloudflare DNS, Cloudflare Tunnel, Zero Trust, CDN / WAF, SSL Management
Automation Engineering:
Puppeteer, Playwright, Selenium, Web Scraping, Data Crawling, Browser Fingerprint, Proxy Management, Session Isolation
AI Engineering:
LLM Integration, OpenAI / Claude / Gemini, Self-hosted Models, GPU Deployment, OCR / ASR / TTS, RAG / Embedding, Vector Database
Backend Engineering:
REST API, WebSocket, JWT / OAuth2, RBAC, Rate Limiting, CSRF/XSS Prevention, Horizontal Scaling
Database Engineering:
PostgreSQL, MongoDB, MySQL, Redis, Data Modeling, Query Optimization, Backup & Recovery
Mail Infrastructure:
SMTP / IMAP, DKIM / SPF / DMARC, Mail Deliverability, Email Reputation, Self-hosted Mail
Security & Cyber:
Web Security, Session Security, Bot Detection, Server Hardening, SSL/TLS Security, Fingerprinting
Product Engineering:
Ecommerce Platform, SaaS Development, Internal Enterprise Tools, Utility Applications, Browser Extensions, AI-powered Applications
Highlighted experience
High-traffic Ecommerce system
Designed an Ecommerce system serving many concurrent users with Redis cache, Nginx reverse proxy, PostgreSQL and background workers. Optimized queries, indexing and caching strategy.
Redis
Nginx
PostgreSQL
Queue Workers
Browser Automation & Anti-Detection platform
Built a large-scale automation system with Puppeteer/Playwright, managing browser fingerprints, proxies, session isolation and scheduled automation for data crawling/extraction.
Puppeteer
Playwright
Fingerprint
Proxy
Self-hosted AI services deployment
Deployed AI models on dedicated GPU infrastructure: OCR, ASR, TTS, Background Removal, inference servers and integrated LLMs (OpenAI, Claude, Gemini) into real applications, including RAG with vector databases.
GPU
Inference
RAG
LLM APIs
Self-operated Mail Server infrastructure
Self-hosted and operated a complete mail server: SMTP, IMAP, DKIM, SPF, DMARC, optimizing deliverability and email reputation for domain-based email infrastructure.
SMTP
DKIM
SPF
DMARC
Mobile App Development (React Native)
Built cross-platform mobile applications using React Native, deployed to Google Play Store and Apple App Store. Experienced in handling store rejection cases, securing connections (SSL Pinning), protecting in-app data, preventing Man-in-the-Middle session hijacking attacks, and implementing Deep Links on both mobile and server sides.
React Native
Play Store
App Store
SSL Pinning
Deep Link