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AI Engineer

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Xelix

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Location:
United Kingdom , London

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

65000.00 - 75000.00 GBP / Year
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Job Description:

At Xelix, we work with some of the world’s largest companies to automate and strengthen their financial controls. Our AI solutions redefine how Accounts Payable teams operate - moving from manual processes to automated, intelligent workflows. We are now hiring for a Mid-Level AI Engineer to join our growing AI Engineering team. This role is an exciting opportunity to leverage state-of-the-art technology, including the latest LLMs and AI technologies, to power our tools and develop impactful new solutions for our customers.

Job Responsibility:

  • Model Development: design, train, and evaluate end-to-end ML models - from preprocessing to deployment - working with text, vision, and tabular data
  • LLM & AI Systems: build and refine applications leveraging large language models, prompt engineering, and agentic frameworks to solve real-world business problems
  • Production Code: write clean, maintainable Python for AI/ML applications and collaborate with our back-end team to integrate seamlessly into the platform
  • Experimentation & Research: stay current with the latest AI/ML techniques, test new algorithms and tools, and improve upon existing approaches
  • Collaboration: work closely with product, data, and engineering teams to deliver high-impact, customer-facing features

Requirements:

  • 2-5 years’ experience delivering ML or LLM-powered features to production, from data prep and model training to deployment and iteration
  • Strong Python skills for AI/ML applications - clean, well-tested code, version control best practice, and smooth integration with back-end systems
  • Hands-on experience with gradient-boosted models (e.g., XGBoost, LightGBM) and/or building LLM-powered systems (e.g. tool/function calling, prompt design, evals) for text-heavy tasks
  • Solid data skills: SQL, pandas, experiment tracking, and cloud deployment (AWS a plus)
  • A passion for AI/ML, shown through personal projects, a well-maintained GitHub portfolio, blog posts, or contributions to the AI/ML community
  • Strong collaboration skills - able to work closely with engineers, product managers, and data teams to ship impactful features
What we offer:
  • 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

Additional Information:

Job Posted:
January 04, 2026

Employment Type:
Fulltime
Work Type:
Hybrid work
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