Full-Stack Developer (Node.js / React)

Full-Stack Developer (Node.js/React) with strong backend/frontend, database, networking and high-load architecture skills. Stack: Node.js, Express, React, MySQL/PostgreSQL, Docker, WebSocket.

Strong understanding of backend/frontend development, databases, networking and architecture of high-load systems. Backend: Node.js, Express, Sequelize. Frontend: React, Vite, Tailwind CSS, Zustand, Axios; basic PixiJS and SEO understanding. Databases: MySQL, PostgreSQL; transactions, locks, concurrent access; building and optimizing complex SQL queries; understanding race conditions and concurrency issues. Infrastructure/DevOps: Docker, Nginx setup, Redis, RabbitMQ and task queues, Elasticsearch + Kibana, Prometheus + Grafana, CDN, DDoS protection at L3/L7, proxy/reverse proxy. API/Integrations: ability to understand and work with undocumented APIs, OAuth and authorization basics, Telegram Bot API, TDLib. AI tools: confident work with Claude and ChatGPT; using AI tools in daily development (code analysis/writing, refactoring, debugging, solutions); ability to set technical tasks to neural networks and verify results. Security: SQL Injection protection, type substitution and invalid input validation, race conditions, basic cryptography (RSA, SHA, hashing), obfuscation, browser/device fingerprinting. Architecture: designing high-load system architecture; scaling, fault tolerance and concurrent data processing; interaction between services, queues, DB, cache and real-time components. Will be a plus: basic probability theory, blockchain principles and networks (Bitcoin, TON, Ethereum/ERC, TRON), experience with non-standard APIs and integrations.