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Whitbread Inns Logo Whitbread Inns · IT - Software Development

Lead Experimentation Engineer (Front-End)

United Kingdom, London Employment contract 50000.00 - 55000.00 GBP / Year · Job Posted June 29, 2026
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Job Description

We’re looking for a Lead Experimentation Engineer to help shape how customers experience our website. Experimentation is central to how we optimise performance, and this role sits at the heart of turning insight and ideas into live, impactful tests. You’ll take agreed test plans and bring them to life by building A/B experiments that reach real customers and deliver measurable improvements to both experience and commercial results.

Job Responsibility

  • Own the build and deployment of website experiments using HTML, CSS and JavaScript
  • Translate test plans and designs into robust, production ready A/B tests
  • Leverage experimentation platforms to deliver high-impact front-end experiences at scale
  • Act as the technical authority for experimentation across the team
  • Apply a customer first mindset while improving conversion and performance
  • Ensure thorough QA across browsers and devices to ensure high-quality delivery
  • Set engineering standards and review experimentation code to ensure quality and scalability
  • Collaborate closely with technical and nontechnical stakeholders
  • Guide and mentor engineers working on experimentation

Requirements

  • Proven front-end engineering experience (HTML, CSS, JavaScript)
  • Experience building experiments in an experimentation platform such as Adobe Target or similar
  • Strong QA discipline and attention to detail
  • Confidence communicating with stakeholders
  • Curiosity, problem-solving and a desire to see your work make a real impact
  • A strong commercial mindset, with a clear understanding of how experimentation drives revenue, conversion and customer value

Nice to have

  • Experience implementing marketing tagging with Adobe Launch, Google Tag Manager or similar
  • Experience with analytics like Adobe Analytics, Google Analytics or similar
  • Experience with UX design

What we offer

  • Bonus up to 20%
  • Health insurance
  • Pension up to 10% matched
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