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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. In this role you’ll grow, be challenged and help shape the future of Xelix. We are hiring an AI Engineer to join our growing AI Engineering team. You’ll design and build production AI systems — combining machine learning, large language models, and strong engineering — to solve real problems across documents, email, and financial data. We focus on building systems that work reliably in production, not just prototypes. We use modern AI tools extensively in our workflow, enabling engineers to operate at a higher level — focusing on system design, product thinking, and solving complex problems.

Job Responsibility:

  • AI Systems & Agents: design and build production AI systems — including agent-based workflows, tool use, and multi-step reasoning
  • Model Development & Adaptation: develop and improve models across text, vision, and structured data, including fine-tuning and hybrid ML + LLM approaches
  • LLM Platform Work: work with hosted and self-hosted models, contributing to decisions around model selection, performance, and cost
  • Production Engineering: write clean, maintainable Python and contribute to scalable, observable systems
  • Evaluation & Iteration: design evals, measure performance rigorously, and improve systems using real-world feedback
  • AI-Assisted Development: use modern AI coding tools to move faster while maintaining high standards
  • Collaboration: work closely with product and engineering teams to deliver high-impact features

Requirements:

  • 2–5 years building and shipping ML or AI-powered systems into production
  • Strong Engineering Skills: clean, testable Python
  • solid software design
  • experience working in production environments
  • AI/ML Breadth: experience with either traditional ML (e.g. gradient boosting) and/or LLM systems (prompting, tool use, evals, agents)
  • Systems Thinking: ability to reason about trade-offs (accuracy, latency, cost, reliability) and design accordingly
  • Data Skills: SQL, pandas, and experience working with messy real-world data
  • AI-Native Workflow: comfortable using AI-assisted coding tools effectively
  • Curiosity & Ownership: proactive in exploring new approaches and improving existing systems
  • Collaboration: strong cross-functional working style
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:
April 05, 2026

Work Type:
Hybrid work
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