Senior Python Engineer - Contract - Outside IR35
Location: London, England, United Kingdom
Department: Engineering
Workplace: hybrid
Description
We are hiring a Senior AI Engineer to join a team responsible for recommendation systems across web and mobile, working on a key AI-driven product, the AI Stylist.
This is a production-focused role. The AI Stylist is already live to customers and expected to scale significantly, with a large backlog of enhancements and increasing demand.
This is a hybrid position where 3 days per week are expected onsite in central London.
About the Role
You will join the Recommendations team, contributing to the AI Stylist experience, an AI-powered product that combines conversational interfaces with recommendation capabilities.
The work sits at the intersection of engineering and AI, focused on improving relevance, quality, and reliability in a live, customer-facing system.
You will collaborate closely with engineers, data scientists, and product stakeholders to evolve the system and support its rapid growth.
What You’ll Be Doing
• Building and evolving AI-powered services using Python
• Designing and implementing evaluation frameworks for LLM-based systems
• Improving output quality through structured evals rather than purely code changes
• Applying techniques such as LLM-as-a-Judge to assess response and recommendation quality
• Working with non-deterministic systems and iterating based on real-world behaviour
• Integrating AI services into a broader platform and API ecosystem
• Contributing to production readiness including reliability, observability, and performance
• Partnering with data scientists on prompts, model usage, and evaluation strategies
Requirements
What We’re Looking For
Core experience
• Strong Python engineering experience in production environments
• Experience building AI-enabled applications, particularly in recommendation or conversational systems
• Hands-on experience with evaluation frameworks for LLM or AI systems
• Clear understanding of how AI systems differ from traditional deterministic systems
• Ability to design meaningful evals and improve system quality over time
• Experience working in cross-functional teams with engineering, data, and product
Nice to have
• Experience with Azure AI services or similar platforms
• Familiarity with OpenAI or similar SDKs
• Exposure to infrastructure and distributed systems
• Experience with tools such as Terraform or Kafka
Benefits
Competitive day rate
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