AI Engineer

We're looking for an AI Engineer to design, build, and ship AI-powered features for our clients' Python web applications. You'll take LLM and machine learning ideas from prototype to production, adding AI search, intelligent agents, and automation to Django and FastAPI products. You'll work closely with our senior Python engineers and with client teams.

Key responsibilities:

- Design and build LLM-powered features such as retrieval-augmented generation (RAG), semantic search, chat assistants, and AI agents
- Integrate LLM APIs (e.g. OpenAI, Anthropic, Gemini) and open-source models into Django and FastAPI services
- Build and maintain data pipelines for document ingestion, chunking, embeddings, and vector search
- Engineer prompts, tool and function calling, and multi-step agent workflows
- Set up evaluation, testing, and monitoring for AI features, covering quality, latency, cost, and safety
- Optimise performance and cost through caching, model selection, and batching
- Make sure AI features are secure, privacy-conscious, and compliant with UK GDPR
- Work with clients in discovery sprints to find practical, high-value AI use cases
- Keep up with the fast-moving AI ecosystem and share knowledge across the team

• Telecommuting is OK
• Agencies are OK

• 3+ years of professional Python development experience, including at least 1 year building LLM or ML features used in production
• Hands-on experience with LLM APIs and frameworks (e.g. OpenAI/Anthropic SDKs, Lang Chain, Llama Index, or similar)
• Solid understanding of RAG architectures, embeddings, and vector databases (pgvector, Pinecone, Weaviate, Qdrant, or similar)
• Experience building APIs with FastAPI or Django; async Python is a plus
• Strong PostgreSQL skills; pgvector experience is a plus
• Familiarity with prompt engineering, tool/function calling, and agent design patterns
• Experience evaluating and monitoring LLM output (eval frameworks, tracing, observability tools)
• Working knowledge of Docker, cloud platforms (AWS, GCP, or Azure), and CI/CD
• Good testing discipline with pytest
• Understanding of AI safety, data privacy, and responsible AI practices
• Clear communication skills and the ability to explain AI trade-offs to non-technical clients
• Nice to have: experience with ML fundamentals (PyTorch, Hugging Face, fine-tuning), Wagtail, or open-source contributions
• Degree in Computer Science, AI/ML, or a related field, or equivalent practical experience

Webbyfox is a UK-based Python web development agency. Our senior Python engineers build web applications and APIs for UK teams using Django and FastAPI.

We deliver new Django applications and FastAPI services, upgrade and rescue ageing Python/Django codebases, and provide Python developers for hire or white-label work. We also offer Wagtail CMS, AI-powered search and agents, and PHP (Laravel/Word Press) maintenance. Our stack centres on modern Django (5.2 LTS / 6.0), FastAPI and PostgreSQL.

Our recent work includes Let Record, a compliance tool for landlords and letting agents in England, and Room Nest, a room-rental marketplace covering London, Birmingham and Manchester. We build to WCAG 2.2 AA and the  Service Standard for public-sector projects.

We are remote-first and work across EU and US hours. Clients own their code from day one, and we work in focused four-week build cycles. Webbyfox is a trading name of Yira Ltd, registered in England & Wales.