AI Engineer - Freelancer

Monterail Sp. z o.o. has over 150 experts and has completed 900+ projects. The company builds web and mobile applications for startups and industry leaders worldwide using technologies such as Ruby on Rails and Vue.js.

• Strong software engineering background, preferably in Node.js or Ruby
• Experience integrating LLM APIs into production systems
• Ability to design pragmatic AI solutions within existing architectures
• Understanding of cost, latency, and reliability constraints of AI systems
• Ability to explain AI limitations to clients and guide realistic expectations
• Solid communication skills and a consultative mindset
• English language proficiency at B2/C1 level
• Availability for part-time or full-time work under a B2B contract
• Familiarity with modern AI tooling such as LangChain, LlamaIndex, or Vercel AI SDK

• Adding AI functionality into existing Node.js, Ruby, Python, React, and React Native codebases
• Building LLM-powered features including chat, summaries, classification, smart search, and document Q&A
• Designing lightweight RAG pipelines using embeddings and vector search
• Working with vector databases such as pgvector, Pinecone, and Qdrant
• Implementing safe and reliable LLM endpoints using OpenAI, Anthropic, and Azure
• Collaborating with project managers and clients to shape realistic AI features and transform workflows to reduce manual effort
• Advising clients when not to use AI and considering trade-offs related to latency, accuracy, cost, and maintainability