Harnham
Senior CRO Developer
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Senior CRO Developer
Senior CRO Developer
Location: London (Hybrid - 2–3 days per week in office) Salary: Up to £60,000
A digital optimisation agency specialising in analytics, SEO, and experimentation is seeking a Senior CRO Developer to join their expanding team.
Role Overview
Informative, solutions-focused experimentation plays a central part in accelerating business growth. In this role, the Senior CRO Developer will take ownership of technical experimentation execution, contributing creative, fast-paced input to A/B and multivariate tests.
Key Responsibilities
- Build and deploy A/B and multivariate tests across multiple client websites
- Collaborate closely with CRO and optimisation teams to deliver experiments
- Support ongoing conversion performance optimisation for client accounts
- Occasionally be client-facing to facilitate technical delivery discussions
- Work as part of a small, agile CRO development team, taking ownership of builds
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Key Requirements
- Strong experience in CRO/experimentation development (agency experience preferred)
- Hands-on experience with tools such as Optimizely, VWO, or similar
- Comfortable in a high-output environment (expectation: ~20 tests/month)
- Strong technical understanding of web development and testing frameworks
- Ability to work independently and manage workload across multiple clients
- Applicable experience with JavaScript, JavaScript libraries, and common HTML/CSS markup languages
- Clientside or serverside experience is a plus
- Strong problem-solving abilities in technical development
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About the Team
Join a fast-growing, award-winning agency offering strong exposure to experimentation at scale within a high-performance optimisation environment. The team thrives in agility, innovation, and a results-oriented culture. Great opportunity for further development across experimental design and execution.
Applicants must proof read their resumes and demonstrations of work. Where possible, please include an uploads tab with a paragraph(s)-long description of your production knowledge and relevant experience.
Find out more and apply here.
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