Staff / Lead Backend Engineer (Node.js / NestJS/ (AI-first)

Hello,
We are called People More because we treat our employees with respect, but also because the projects we work on are for people and should be easy and pleasant to use. We are technological, but we look at the bigger picture :)
The company is made up of people with a huge client base in the country and abroad, for whom we build projects from scratch (UX, UI, frontend, backend, mobile) or in part. We work directly for our clients and also support our partners in their own solutions. This ensures a wide range of projects and the ability to change! We work with clients all over the world.
For the project that we are working on with our partner, we are looking for Staff / Lead Backend Engineer (Node.js / NestJS/ (AI-first).Your duties will include:

• Designing backend architecture for a scalable product

• Developing and maintaining backend services in Node.js / NestJS

• Leading technical and architectural decisions

• Building event-driven systems and queue-based processing

• Ensuring security, observability, and high code quality

• Supporting AI/LLM integrations on the backend side

• Using AI/agentic coding tools in day-to-day development work

Requirements that must be met:

• 7+ years of production backend experience,

• Strong production experience with Node.js / TypeScript and NestJS,

• PostgreSQL: query plans, indexes, transactions, raw SQL when needed, not only ORM,

• Async/event-driven systems: queues, retries, idempotency, job processing,

• Security: OAuth 2.0, RBAC/ABAC, OWASP, audit logs, secrets, permission boundaries,

• Multitenancy / data isolation / RLS-style patterns,

• Writing ADRs and leading architectural decisions,

• Experience with agentic coding, combined with a very strong quality mindset.

• Very good English and Polish

Nice to have:

• Experience building systems at real scale: high traffic, large user base, high availability,

• OpenTelemetry, distributed tracing, structured logging, dashboards, alerting,

• Cloud experience (preferably GCP/GKE),

• Stripe / payments,

• Backend-level LLM integrations.