CRO Developer

Harnham; Manchester; Hybrid; GBP 48,000 - 80,000; Full time

Benefits offered by this job

Hybrid working model

Career progression opportunities

Job summary

Harnham is seeking a CRO Developer to build, implement and maintain A/B tests across high-traffic digital platforms. You will collaborate with analysts, marketers, designers and stakeholders to translate hypotheses into live experiments that drive measurable business results.

In this role you will work with Optimizely, VWO, AB Tasty, Convert, Dynamic Yield and other leading tools to optimise personalisation and testing programs, ensuring robust tracking and performance across products.

Qualifications

• Strong commercial experience as a CRO Developer, Front End Developer, or Experimentation Developer.
• Experience with CRO and experimentation platforms such as Optimizely, VWO, AB Tasty, Convert, Dynamic Yield, or similar.
• Strong understanding of A/B testing methodologies and experimentation principles.
• Experience working with web analytics and performance measurement tools.
• Ability to write clean, efficient, and maintainable front-end code.
• Understanding of customer journeys, user behaviour, and conversion optimisation.
• Comfortable working closely with technical and non-technical stakeholders.
• Experience within performance marketing, ecommerce, lead generation, or high traffic digital environments is beneficial.

Responsibilities

• Develop high-quality experiment code across websites and digital platforms.
• Work with CRO and product stakeholders to turn testing ideas into live experiments.
• Implement personalisation and experimentation campaigns using leading CRO tools.
• Ensure experiments are technically robust, performant, and accurately tracked.
• Debug, troubleshoot, and optimise testing implementations.
• Collaborate with analytics teams to support experiment measurement and reporting.
• Contribute to experimentation best practices, processes, and governance.
• Identify technical opportunities to improve customer journeys and conversion performance.

Skills

CRO Developer

Front End Developer

Experimentation Developer

Optimizely

VWO

AB Tasty

Convert

Dynamic Yield

Tools

Optimizely

VWO

AB Tasty

Convert

Dynamic Yield

Job description

This is a rare opportunity to join a growing digital business where experimentation sits at the heart of decision making. With strong investment in CRO and testing, you will play a key role in creating, deploying, and analysing experiments across high traffic digital platforms. This position offers the chance to make a direct commercial impact while working with modern experimentation tools and technologies.

The Company

They are an established digital performance business operating across multiple international markets. Through a portfolio of proprietary digital platforms, they manage and optimise the full customer journey from acquisition through to conversion. Their data-driven approach to growth has created a strong culture of experimentation, with significant opportunities to improve customer experiences through testing. Continued expansion has led to investment in building internal CRO and experimentation capability.

The Role

As a CRO Developer, you will be responsible for building, implementing, and maintaining A/B tests and experiments across a range of digital products. You will work closely with analysts, marketers, designers, and stakeholders to translate hypotheses into live experiments that drive measurable business results.

• Develop high-quality experiment code across websites and digital platforms
• Work with CRO and product stakeholders to turn testing ideas into live experiments
• Implement personalisation and experimentation campaigns using leading CRO tools
• Ensure experiments are technically robust, performant, and accurately tracked
• Debug, troubleshoot, and optimise testing implementations
• Collaborate with analytics teams to support experiment measurement and reporting
• Contribute to experimentation best practices, processes, and governance
• Identify technical opportunities to improve customer journeys and conversion performance

Your Skills & Experience

• Strong commercial experience as a CRO Developer, Front End Developer, or Experimentation Developer
• Experience with CRO and experimentation platforms such as Optimizely, VWO, AB Tasty, Convert, Dynamic Yield, or similar
• Strong understanding of A/B testing methodologies and experimentation principles
• Experience working with web analytics and performance measurement tools
• Ability to write clean, efficient, and maintainable front-end code
• Understanding of customer journeys, user behaviour, and conversion optimisation
• Comfortable working closely with technical and non-technical stakeholders
• Experience within performance marketing, ecommerce, lead generation, or high traffic digital environments is beneficial

What They Offer

• Hybrid working model with flexibility
• Opportunity to help shape a growing experimentation function
• Exposure to high traffic digital products and large-scale testing programmes
• Strong career progression opportunities
• Collaborative and data-driven environment