Senior Backend Engineer (TypeScript / NestJS)

We are looking for a Senior Backend Engineer with expertise in TypeScript and NestJS for an AI product. The position is remote or in-office in Warsaw.

• •Senior level in TypeScript / Node.js and NestJS.
• •Production experience with WebSockets, Socket.IO, SSE.
• •Postgres and vector databases (pgvector or analogs).
• •Queues, workers, performance, and load handling.
• •Practical experience with LLM API, agents, and tool-calling.
• •Experience designing dialogue memory systems.
• •Understanding of RAG, retrieval, embeddings, and context windows.
• •Experience in creating high-load real-time systems and interest in AI/ML research is a big plus.