Full-Stack Developer (Node.js / React)

Full-Stack Developer (Node.js / React). Backend/frontend, databases, networking, high-load architecture. Stack: Node.js, Express, Sequelize, React, Vite, Tailwind, Zustand, Axios, MySQL, PostgreSQL, WebSocket, Socket.IO, Centrifugo.

Backend: Node.js, Express, Sequelize Frontend: React, Vite, Tailwind CSS, Zustand, Axios Databases: MySQL, PostgreSQL Real-time: WebSocket, Socket.IO, Centrifugo Databases: - Confident work with MySQL / PostgreSQL - Transactions, locks, concurrent access - Building and optimizing complex SQL queries - Understanding race conditions and concurrency issues Infrastructure / DevOps: - Docker - Nginx configuration - Redis, RabbitMQ, and task queues - Elasticsearch + Kibana - Prometheus + Grafana - Understanding CDN - Understanding DDoS protection principles at L3/L7 levels - Understanding proxy / reverse proxy operation 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 Nice to have: - Basic understanding of probability theory - Understanding blockchain and main networks: Bitcoin, TON, Ethereum/ERC, TRON - Experience with non-standard APIs and integrations