Full Stack Engineer - AI Systems for Proactive Workflows

BJAK; Warszawa; On-site; PLN 180,000 - 240,000; Full time

Job summary

BJAK Warsaw is seeking a Full Stack Engineer - AI Systems to build production‑grade workflows that turn AI capabilities into practical, user‑facing features.

You will design agent operating models, handle multi‑step tasks, ensure reliability, and drive integration of LLMs, memory, and external tools with low latency.

Collaborate with ML, backend and product teams, own features from idea to production, and continuously improve observability and failure handling.

Qualifications

• Experience delivering end-to-end AI-enabled features.
• Proficiency in frontend and backend integration.
• Knowledge of LLMs, RAG, and tool integration.
• Ability to ship reliable, production-grade workflows.

Responsibilities

• Build end-to-end features across frontend, backend, and AI integrations.
• Design agent workflows for planning, failure handling, and multi-step tasks.
• Integrate LLMs and external tools with real-time performance.
• Collaborate with ML, backend and product teams to ship features.
• Improve reliability, observability, and fallback mechanisms.

Skills

Full stack engineering

System design

LLMs/RAG systems

Ambiguity management

Ownership

Fast-paced environments

Tools

Next.js

Python

Node.js

PyTorch

OpenAI/Anthropic/LLMs

SQL

NoSQL

Kubernetes

Docker

Job description

BJAK Warsaw is seeking a Full Stack Engineer - AI Systems to build production‑grade workflows that turn AI capabilities into practical, user‑facing features.

You will design agent operating models, handle multi‑step tasks, ensure reliability, and drive integration of LLMs, memory, and external tools with low latency.

Collaborate with ML, backend and product teams, own features from idea to production, and continuously improve observability and failure handling.