Senior CRO Developer

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London / £60000 - £60000 annum

INFO

Salary

SALARY:

£60000 - £60000

Location

LOCATION

London

Job Type
JOB TYPE

Permanent

Senior Front-End Developer (CRO / Experimentation)

London (Hybrid - Shoreditch)

Up to £60,000

The Opportunity

We're working with a fast-growing digital optimisation agency looking for a Senior Front-End Developer (CRO) to join their experimentation team.

This is a hands-on role where you'll build and deliver high-quality A/B test experiences, working closely with analysts, designers, and strategists to improve conversion and user experience across a wide range of client projects.

Key Responsibilities

  • Build and deliver high-quality A/B testing experiences using HTML, CSS, and JavaScript
  • Own technical implementation of experiments from setup to delivery
  • Work with platforms such as Optimizely, VWO, AB Tasty, or similar
  • Lead onboarding and configuration of testing tools for clients
  • Ensure QA, documentation, and smooth deployment of experiments
  • Collaborate with cross-functional teams to bring ideas to life
  • Act as a trusted technical partner to clients and internal teams
  • Mentor junior developers and contribute to best practices

What We're Looking For

  • 2+ years' experience in CRO, experimentation, or front-end development
  • Strong skills in HTML, CSS, and JavaScript
  • Experience delivering A/B tests or personalisation experiments
  • Familiarity with testing platforms (Optimizely, VWO, etc.)
  • Strong problem-solving and multi-project management skills
  • Excellent communication skills with both technical and non-technical stakeholders
  • Agency or multi-client experience (preferred)
  • Interest in analytics, SEO, or performance optimisation (nice to have)

Ways of Working

  • Hybrid model (2 days in office)
  • Collaborative, experimentation-led environment
  • Exposure to a variety of clients and industries
  • Strong focus on learning, innovation, and career growth

Benefits

  • £40,000-£50,000 salary + pension
  • 25 days holiday + rollover options
  • Work from anywhere for up to 4 weeks per year
  • Private wellbeing support (including mental health resources)
  • Charity contributions matched by employer
  • Career progression and development opportunities
  • Flexible benefits shaped by employees
  • Hybrid setup with home office support

How to Apply

If you're a front-end developer passionate about experimentation and optimising digital experiences, we'd love to hear from you.

Apply with your CV or get in touch to me!


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