Copy of VodafoneThree: Finance Manager – Strategic Planning

We’re creating something special. We are joining forces to create the biggest mobile network provider in the UK. Through our collective strengths and talents, we will transform customers’ experience and create a best-in-class network for coverage, connectivity, and reliability, delivering greater value and more choice for the nation than ever before.

There are very few moments in our careers where we can feel the ground shifting beneath us, where we can sense that something bigger than we’ve known before is taking shape. We’re not just building a company. We’re going to build a culture, a legacy and a future to be proud of. This will require remarkable leadership and together we can set the standard in the industry and beyond for both customer and employee experience, in what it is a career-defining opportunity.

Within this context, the CRO Developer plays a foundational role in supporting the organisation’s conversion rate optimisation agenda. Working alongside the CRO Manager, the Specialist helps design, deliver and analyse digital experiments across all brands, lines of business and customer journeys.

This role contributes to the optimisation programme by helping shape hypotheses, build test variants, managing test setups and supporting with the QA and technical delivery of all testing. It offers a strong development path into a more senior CRO, UX or digital performance career.

What you'll do 

• Partner with CRO Managers to support technical feasibility assessments, sizing, prioritisation, and delivery across CRO, future capability, and personalisation roadmaps.
• Collaborate closely with UX, Design, Product, and Engineering teams to create test‑ready assets and customer experiences.
• Build and configure experiments across CRO platforms, ensuring high‑quality QA reviews and accurate implementation.
• Use HTML, CSS, and JavaScript to deliver reliable CRO experiments with correct audiences, triggers, targeting, and measurement rules.
• Monitor experiments in real time, ensuring sample balance, tracking accuracy, audience behaviour integrity, and overall experiment validity.
• Maintain accurate documentation, including requirements, test logs, outcomes, and associated tickets.
• Contribute to an open, learning‑focused experimentation culture, promoting continuous improvement and knowledge sharing across teams.
• Provide guidance and training to Engineering colleagues on CRO best practices, supporting their ongoing development.
•  Work effectively with technical and non‑technical stakeholders to deliver high‑quality tests, insights, and tracking implementations.

 

• Experience with digital optimisation and CRO programmes, including the use of experimentation tools such as Optimizely, Adobe Target, Google Optimize, or LaunchDarkly.
• Hands‑on skills in HTML, CSS, JavaScript, and feature flags to deliver accurate, high‑quality front‑end and full‑stack CRO activities.
• Understanding of statistical significance and key digital performance metrics, with the ability to interpret experiment outcomes.
• Collaborative approach, working confidently with UX, Design, Product, and Engineering teams to shape and develop test variants.
• Strong organisational and communication skills, with attention to detail, the ability to manage multiple experiments simultaneously, and a proactive, curious mindset to develop advanced CRO capabilities.

Worried that you don’t meet all the desired criteria exactly?  

We know that everyone is unique, with multiple aspects to their identity and different experiences behind them. We are passionate about Inclusion for All and creating a workplace where everyone can thrive, whatever their personal or professional background. If you’re excited about this role but your experience doesn’t align exactly with every part of the job description, we encourage you to apply as you may be the right candidate for this role or another role, and our recruitment team can help you see how your skills fit in. 

Need to know

We are regulated by the Financial Conduct Authority and all offers of employment for this role are subject to background checks, including criminal (DBS) and financial checks to meet the regulators standards.

We believe everyone should have the opportunity to interview for a role that matches their skills. In collaboration with our Talent, Diversity & Inclusion teams and our employee-led DEI Networks, we identified a range of reasonable adjustments to help you feel comfortable and perform at your best self during the interview process. If you require any reasonable adjustments or have an accessibility request as part of your recruitment journey, for example, extended time or breaks in between online assessments, a sign language interpreter, or assistive technology, please contact your recruiter directly or email jobs@three.co.uk for guidance.

We use AI in different parts of our business to boost innovation, improve efficiency, and create new opportunities. We know many candidates use AI to fine-tune their CVs or prepare for interviews, but what we really care about is your unique experiences and achievements.

During the interview, we want you to rely on your own knowledge and skills to show us who you really are—your personality, creativity, and abilities. Above all, we’re looking for authenticity and can’t wait to get to know the real you.

 #VodafoneThree