Principal Backend Engineer (Node.js / AI / LLM)

People More is a technology company working on projects for a large client base both domestically and internationally. They build projects from scratch or partially, covering UX, UI, frontend, backend, and mobile development, working directly with clients and supporting partners worldwide.

• 7+ years of commercial backend development experience
• Strong production experience with Node.js, TypeScript, and NestJS
• Solid PostgreSQL knowledge, including query optimization, indexes, transactions, and raw SQL
• Experience building event-driven and asynchronous systems (queues, retries, idempotency, job processing)
• Strong understanding of application security principles including OAuth 2.0, RBAC/ABAC, OWASP, audit logs, secrets management, and permission boundaries
• Experience designing multitenant architectures, data isolation mechanisms, and RLS-style patterns
• Experience making architectural decisions and documenting them through ADRs or similar
• Hands-on experience with AI-assisted software development tools such as Claude Code, Cursor, GitHub Copilot, Windsurf, or similar
• Practical experience with agentic coding using AI agents for complex development tasks
• Ability to collaborate effectively with AI coding agents while maintaining code quality, security, and maintainability
• Strong leadership skills
• Very good English and Polish language skills

• Designing and evolving backend architecture for a scalable product
• Developing and maintaining backend services using Node.js, TypeScript and NestJS
• Driving technical and architectural decisions across the platform
• Building event-driven systems and asynchronous processing workflows
• Ensuring security, reliability, observability, and maintainability of services
• Supporting integrations with AI/LLM-powered solutions
• Leveraging modern AI-assisted development tools in daily engineering work
• Collaborating closely with product, frontend, and AI engineering teams
• Contributing to engineering best practices and technical documentation