Freelance LLM Engineer: Production AI Integrations

Monterail; Wrocław; On-site; PLN 206,640 - 413,280; Part time

Job summary

Monterail is building a network of LLM Engineers to design, build, and integrate AI features into existing products. We’re seeking people to collaborate on a freelance basis—part-time or full-time—depending on project needs.

You will work with Python, Node.js, or Ruby, with hands-on experience integrating LLM APIs into production systems, and you will design pragmatic AI solutions within existing architectures.

Qualifications

• Proven software engineering background in Python, Node.js, or Ruby.
• Hands-on experience integrating LLM APIs into production systems (OpenAI, Anthropic, or similar).
• Ability to design pragmatic AI solutions within existing architectures.
• Experience building RAG pipelines, embeddings and vector search.
• Understanding of cost, latency, and reliability constraints of AI systems.
• Ability to work independently with clients and set realistic expectations.
• Background in big data or data pipelines is a big plus.
• English proficiency at B2/C1 level.

Responsibilities

• Add AI functionality into existing Python, Node.js, and Ruby codebases.
• Build LLM-powered features: chat, summaries, classification, smart search, document Q&A.
• Design lightweight RAG pipelines using embeddings and vector search.
• Work with vector databases (pgvector, Pinecone, Qdrant).
• Implement safe, reliable LLM endpoints (OpenAI, Anthropic, Azure).
• Work directly with clients to shape AI features and manage expectations.

Skills

Software engineering

LLM API integration

AI solution design

RAG pipelines and embeddings

Cost/latency/reliability awareness

Client-facing work

Big data / data pipelines

English proficiency

Tools

OpenAI API

Anthropic API

Azure OpenAI

pgvector

Pinecone

Qdrant

Job description

Monterail is building a network of LLM Engineers to design, build, and integrate AI features into existing products. We’re seeking people to collaborate on a freelance basis—part-time or full-time—depending on project needs.

You will work with Python, Node.js, or Ruby, with hands-on experience integrating LLM APIs into production systems, and you will design pragmatic AI solutions within existing architectures.