LLM Engineer - Freelancer

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

We're building a network of LLM Engineers who can design, build, and integrate practical AI features into existing products. We're looking for people to collaborate with on a freelance basis - part-time or full-time, depending on project needs.

This role is focused on delivery, not ML research. What matters most is your engineering foundation and your ability to integrate AI into real production systems using Python, Node.js, or Ruby codebases.

Requirements

What we're looking for

• Strong software engineering background - 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 B2/C1
• Availability part-time or full-time (B2B contract)

What You'll Do

• 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 DBs (pgvector, Pinecone, Qdrant)
• Implement safe, reliable LLM endpoints (OpenAI, Anthropic, Azure)
• Work directly with clients to shape AI features and reduce manual effort
• Advise clients when NOT to use AI and navigate trade-offs around latency, accuracy, and cost

What do we mean by freelance?

• Read more at Monterail Tech Network