Backend Developer willing to work with AI (Node.js, Python, RAG) CML Team $$$

Madfish

Madfish

Software Engineering, Data Science

Ukraine · Europe

Posted on May 10, 2026

About us

We build AI-powered solutions that solve real business problems. You’ll work with the latest technologies and implement production-grade AI features, including RAG pipelines, agentic and multi-agent workflows.

Responsibilities

  • Solve engineering problems related to process automation, knowledge systems, and agentic / multi-agent architectures.
  • Design, build, and maintain AI-powered features that go beyond basic LLM API calls.
  • Develop backend services using Node.js (Express, Fastify, or NestJS).
  • Implement and iterate on RAG pipelines (retrieval strategies, chunking, evaluation, quality improvements).
  • Integrate external APIs, payment systems, and authentication flows.
  • Design clean REST APIs and ensure reliable client–server communication.
  • Work with PostgreSQL.

Requirements

  • Strong problem-solving mindset, creativity, and ability to learn quickly.
  • Solid Node.js experience in production (2+ years).
  • Practical experience and strong interest in LLM-based systems, not just simple ChatGPT-style wrappers, including:
    • RAG
    • LangChain (bonus: LangGraph, LangSmith)
    • Prompt engineering
  • Understanding of backend fundamentals: APIs, databases, performance, and debugging.

Nice to have

  • Experience with Python and FastAPI.
  • Redis, queues, caching.
  • AWS or GCP familiarity.
  • CI with GitHub Actions.
  • Monitoring and tracing tools (Prometheus, Grafana, OpenTelemetry).

What we offer

  • Competitive salary and bonuses
  • Remote-first culture
  • Flexible schedule
  • Open-minded, results-driven environment
  • Product ownership and impact