Full-Stack Developer (Node.js / React)

Full-Stack Developer (Node.js/React) with strong backend/frontend, databases, networking and high-load architecture. Stack: Node.js, Express, Sequelize, React, Vite, Tailwind CSS, MySQL/PostgreSQL, WebSocket, Docker, Redis, RabbitMQ, Elasticsearch, Prometheus/Grafana.

Backend: - Node.js, Express, Sequelize - MySQL, PostgreSQL: confident work, 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 - Understanding CDN - Understanding DDoS protection at L3/L7 levels - Understanding proxy / reverse proxy Frontend: - React - Vite - Understanding native Webpack configuration - Tailwind CSS - Zustand - Axios - Basic knowledge of PixiJS - Basic understanding of SEO API / Integrations: - Ability to understand and work with undocumented APIs - OAuth and basic authorization principles - Telegram Bot API - Experience/understanding of working with TDLib AI tools: - Confident work with Claude and ChatGPT - Using AI tools in daily development: code analysis and writing, refactoring, debugging and finding solutions - Ability to correctly set technical tasks for neural networks and verify results Security: - Understanding SQL Injection and protection methods - Checking type substitution and invalid input data - Race conditions - Basic understanding of cryptography: RSA, SHA and hashing - Understanding obfuscation - Understanding browser/device fingerprinting Architecture: - Ability to design architecture of high-load systems - Understanding scaling, fault tolerance and concurrent data processing - Understanding interaction between services, queues, DB, cache and real-time components Will be a plus: - Basic understanding of probability theory - Understanding blockchain principles and main networks: Bitcoin, TON, Ethereum/ERC, TRON - Experience with non-standard APIs and integrations