Fullstack Developer - Typescript/Node.js

Full-stack Developer (TypeScript / Node.js) – 100% Remote (Poland)Optiveum is looking for experienced Full-stack Developers to join a long-term project delivered for a fast-growing, international technology company building AI-driven automation solutions for finance and accounting processes. UWAGA: Wymagana jest dobra znajomość języka polskiego ✅ What’s offeredB2B cooperation with Optiveum (Poland-based IT recruitment & outsourcing company) Long-term project (03.2026 – 03.2027, with extension potential) 100% remote work from Poland Stable collaboration with a global enterprise client On-time invoice payments Rate: up to 120 PLN/h (B2B) Your roleDevelop full-stack features (React.js / Vite + Node.js / Express.js) Build and optimize data processing pipelines (including AI/automation workflows) Integrate with ERP/accounting systems Participate in architecture discussions, code reviews, and sprint planning Must-have skills3+ years of experience with TypeScript, Node.js, Express.js Experience with cloud environments (AWS, GCP, Kubernetes) Strong knowledge of REST APIs, RabbitMQ, PostgreSQL, MongoDB Understanding of distributed systems, OOP & FP principles (KISS, DRY) Ability to write clean, maintainable code and test your solutions Fluent Polish & English Nice to haveExperience with AI / LLM integrations Knowledge of ERP or accounting systems Experience with React, Zustand, SCSS Familiarity with Grafana / Datadog Recruitment processHome assignment Technical interview (for selected candidates): Code review (30 min) Technical questions (30 min) Live coding (30 min)