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Posted 21 July, 2026

Senior CRO Developer

Harnham - Data & Analytics Recruitment
London, ENG, GB Full Time

Job Description

Senior CRO Developer\n

Location: London, Hybrid (2-3 days per week in office)Salary: Up to £60,000Sponsorship: Not available

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Digital optimisation agency specialising in analytics, SEO and experimentation is looking for a Senior CRO Developer to join their growing team.

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This is a key role within a fast-paced CRO function, building and deploying A/B tests across a range of client websites.

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Role overview:

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    Build and deploy A/B and multivariate tests for multiple clients

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    Work closely with CRO and optimisation teams on experimentation delivery

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    Support ongoing optimisation of conversion performance across client accounts

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    Occasionally client-facing to support technical delivery discussions

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    Work as part of a small CRO development team, taking ownership of builds

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Key requirements:

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    Strong experience in CRO / experimentation development (agency experience preferred)

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    Hands-on experience with tools such as Optimizely, VWO or similar

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    Comfortable working in a high-output environment (c. 20 tests per month expectation)

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    Strong technical understanding of web development and testing frameworks

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    Ability to work independently and manage workload across multiple clients

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Fast-growing, award-winning agency offering strong exposure to experimentation at scale and a high-performance optimisation environment.

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Find out more and apply via the link below!