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LLM Engineer - Freelancer

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

What this application asks

workable

First name, Last name, Email, Phone, Resume

  • Do you have at least 4 years of commercial software development experience in backend technologies (e.g., Python, Node, Ruby, etc.) yes / no
  • Describe a production project where you integrated an LLM API - which model and what challenges did you face around cost or latency? written answer
  • Do you have a one-person company (individual entrepreneur)? (If not, we cannot proceed) yes / no
  • What is your hourly rate? Please highlight the currency.
  • What is your availability (hours/week)?
  • Are you located in CET / EET time zone? (Central European /Eastern European Time Zone) yes / no
  • How did you find us? choose any
  • By submitting the application, you consent to the processing of your personal data included in this form for the present recruitment-related purposes (this applies only to the data that go beyond the statutory catalog defined by Polish labor law). I’m am also interested in future recruitment processes at Monterail sp. z o.o. for similar positions and I consent to the processing of my data provided in the form for this purpose. Here you can find more information about the processing of your data. [https://www.monterail.com/privacy-policy-for-employees-and-candidates]. There you will also find detailed information about your rights. Remember, that you can withdraw your consents at any time. yes / no
  • Monterail is committed to high standards of ethical conduct in all business activities and to being in full compliance with all applicable laws and regulations. As a candidate for employment, you can report any irregularities or breaches to us - see our internal whistleblower procedure for further details https://a.storyblok.com/f/202591/x/da08ce142d/procedure-for-internal-reporting-monterail.pdf yes / no

See also

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