Senior Full Stack Developer (Node.js/TypeScript)

Senior Full Stack Developer (Node.js/TypeScript)

Project: last-mile delivery (USA). High-load logistics platform, American clients.

Key tasks: development and architecture of high-load systems, performance optimization, code review, and technical leadership in a small team (about 5 people).

Requirements: • 5+ years of commercial experience • Deep expertise in Node.js/TypeScript • Experience in designing microservice architectures • Understanding of high-load development principles • English B2+

Technologies (updated stack): • Backend: Node.js, TypeScript (ESM everywhere), Fastify 5 (three services: auth, backend, RO), Express 5 + Socket.IO (chat server) • Databases: MySQL (knex + mysql2 for all services except the chat server) • Validation: TypeBox • Logging: Pino • Frontend: React + Vite • Tests: Jest • Infrastructure: Docker (each service has its own Dockerfile), ESLint 9

Bonus points for: experience with queues (RabbitMQ, Kafka, BullMQ), team lead experience, use of AI tools (Cursor, Copilot, Claude Code).

Conditions: remote work (team from Belarus and Poland, clients from the USA), flexible schedule with overlap on US time zones, stable salary in USD, long-term project, corporate English lessons.

About the company: Twelvedevs is an outsourcing company on the market since 2012, with 90+ employees. We specialize in logistics, e-commerce, and fintech. About 90% of projects are international (Europe, USA).

Experience with Fastify (yes/no, if no – are you ready to learn quickly?) Experience with MySQL and Knex Are you familiar with TypeBox and Pino? What is the backend/frontend balance throughout your career? Salary expectations in USD net