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Xelix

Senior AI Engineer

Xelix

. Design and lead end-to-end AI systems from problem framing to production deployment .

Posted 4/21/2026full-timeLondon • 🇬🇧 United KingdomSenior💰 £80,000 - £90,000 per yearWebsite

About the role

Key responsibilities & impact
  • Design and lead end-to-end AI systems from problem framing to production deployment
  • Architect complex agent-based workflows and multi-step reasoning systems
  • Make decisions on model selection, fine-tuning, and appropriate approach
  • Define evaluation frameworks, metrics, and feedback loops for reliability
  • Ensure systems are scalable, observable, and robust in production environments
  • Mentor other engineers and influence technical direction
  • Drive effective use of AI tooling to improve productivity

Requirements

What you’ll need
  • 5+ years building and deploying ML or AI systems
  • Strong System Design Skills
  • Deep AI Expertise with LLM systems or traditional ML
  • Pragmatism in approach to problem-solving
  • Experience designing and using evals to drive system improvements
  • Engineering Excellence with high standards for code quality, testing, and maintainability
  • Leadership & Mentorship experience
  • Strong ability to leverage AI-assisted development tools effectively

Benefits

Comp & perks
  • 27 days of annual leave (including 3 days Christmas closing)
  • 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
  • Lots of team socials & activities
  • Annual team retreat

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools
AI systems designML systems deploymentmodel selectionfine-tuningevaluation frameworksmetrics definitionscalabilityobservabilityrobustnesscode quality
Soft Skills
problem-solvingleadershipmentorshipinfluencepragmatismcommunicationcollaborationdecision-makingtechnical directionproductivity improvement