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Xelix Logo Xelix · IT - Software Development

Senior AI Engineer

United Kingdom, London Employment contract 80000.00 - 90000.00 GBP / Year · Job Posted April 24, 2026
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Job Description

We are hiring a Senior AI Engineer to help shape our AI systems and technical direction. You’ll lead the design and delivery of complex, production-grade AI solutions — combining machine learning, LLMs, and robust engineering practices to build high-impact products. We are a team of builders, focused on systems that work reliably in production, not just prototypes. We use modern AI tools extensively, enabling engineers to operate at a higher level — focusing on architecture, system design, and delivering meaningful product impact.

Job Responsibility

  • Design and lead end-to-end AI systems, from problem framing through to production deployment and iteration
  • Architect complex agent-based workflows, tool ecosystems, and multi-step reasoning systems
  • Make decisions on model selection, fine-tuning, and when to use ML vs LLM vs hybrid approaches
  • Define evaluation frameworks, metrics, and feedback loops to ensure reliability and continuous improvement
  • Ensure systems are scalable, observable, and robust in real-world environments
  • Mentor other engineers, review designs, and raise the bar for engineering and AI practices across the team
  • Drive effective use of AI tooling within the team, improving productivity without compromising quality
  • Work closely with product and leadership to shape what we build and why

Requirements

  • 5+ years building and deploying ML or AI systems, with significant experience in production environments
  • Strong system design skills, ability to design end-to-end AI systems and make sound architectural decisions
  • Deep AI expertise, strong experience with LLM systems (agents, tool use, evals) and/or traditional ML where appropriate
  • Pragmatism, ability to choose the right approach for the problem, balancing complexity, performance, and cost
  • Evaluation mindset, experience designing and using evals to drive system improvements
  • Engineering excellence, high standards for code quality, testing, and maintainability
  • Leadership & mentorship, experience guiding other engineers and influencing technical direction
  • AI-native workflow, strong ability to leverage AI-assisted development tools effectively and thoughtfully

What we offer

  • Competitive salary of £80,000 to £90,000 depending on experience
  • 27 days of annual leave (including 3 days Christmas closing) which increases up to 3 days based on tenure, with the option to roll over, buy or sell up to 3 days
  • Hybrid working with two days a week from our dog-friendly Hoxton office
  • On-site gym and cycle to work scheme
  • Employee discount at over 100 retailers
  • Comprehensive private medical & dental cover with Vitality
  • Enhanced parental leave pay
  • Learning & development culture – £1,000 personal annual budget
  • We’re carbon-neutral and are working towards ambitious carbon reduction goals
  • Lots of team socials & activities
  • Annual team retreat
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