CRO Engineer / Specialist
Job description
Original text imported from Reed
CRO Engineer / Specialist
London, UK, fully remote
Outside IR35, 6-months, £300-400 Day Rate
This is a high-impact opportunity to shape experimentation and optimisation across a fast-growing digital platform. Working fully remote from the UK, you will partner with a UK-based digital team while supporting a wider international organisation, operating on UK working hours. The project offers real ownership, clear deliverables, and the chance to influence measurable commercial outcomes.
The Company
They are a technology-led business operating in the online travel and insurance space, with a strong focus on customer experience and performance-led growth. The organisation combines a mature digital product with an ambitious optimisation roadmap. Their UK-based digital team plays a central role in driving experimentation, insight, and conversion performance across the platform.
The Role and Deliverables
- Work on end-to-end CRO process, from hypothesis generation through to execution and analysis
- Design, build, and deploy A/B and multivariate tests across web journeys
- Work closely with product, design, and analytics teams to prioritise optimisation opportunities
- Implement tracking and experimentation logic to ensure data quality and test validity
- Analyse test results and translate insights into clear recommendations
- Deliver measurable improvements in conversion rate and user experience
Your Skills & Experience
- Strong experience in CRO engineering or hands-on experimentation roles
- Proficiency in implementing and managing tests using leading experimentation tools
- Solid understanding of JavaScript, HTML, and CSS for test development
- Strong analytical capability, with confidence in interpreting behavioural and performance data
- Experience collaborating with cross-functional digital teams in agile environments
- Comfortable working autonomously in a fully remote contract role
How to Apply
Apply now to explore this CRO Engineer / Specialist contract and make an immediate impact on a data-driven digital product.
Key skills
AI-extracted from the job advert
Application advice
5 AI-generated recommendations to maximise your chances.
⭐ Highlight your CRO engineering experience at the top of your CV as this specialist role requires hands-on experimentation expertise
📊 Quantify your conversion improvements: 'Implemented 15 A/B tests increasing conversion by 23%'
🌐 Emphasise your JavaScript, HTML and CSS skills as the role requires building and deploying tests across web journeys
🎯 Showcase experience with leading experimentation tools like Optimizely or VWO as proficiency is essential
🤝 Demonstrate remote working success and cross-functional collaboration in agile environments
Suggested CV bullets
3 bullets our AI drafted for this specific advert, mirroring its ATS keywords.
Add these 3 bullets under your most recent experience:
- •Implemented 18 A/B tests across checkout journey using Optimizely, increasing conversion rate from 3.2% to 4.1% over 6 months
- •Built JavaScript tracking logic for 12 multivariate experiments, ensuring 99.8% data quality and statistical validity
- •Collaborated with 8-person cross-functional team to prioritise CRO roadmap, delivering £2.3M incremental revenue through optimisation
Free to copy — tailoring requires a 30-sec CV upload.
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Letter preview — tailored to Harnham - Data & Analytics Recruitment
Dear Hiring Manager,
Harnham's CRO Engineer contract for the travel platform represents exactly the high-impact experimentation role I'm seeking. My experience implementing A/B tests using JavaScript and leading experimentation tools aligns perfectly with your need for end-to-end CRO process ownership.
My background in conversion rate optimisation includes designing and deploying multivariate tests, implementing tracking logic for data quality, and translating behavioural insights into measurable commercial outcomes. I have successfully collaborated with cross-functional digital teams in agile environments while working autonomously on remote contracts.
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Interview questions
10 questions generated from this advert.
Technical
- ›How would you design an A/B test to improve checkout conversion rates?
- ›What JavaScript methods would you use to implement dynamic test variations?
- ›How do you ensure statistical significance in multivariate testing?
- ›Which experimentation tools have you used and what are their key differences?
- ›How would you implement tracking to measure test validity and data quality?
Behavioural
- ›Tell me about a time you had to work autonomously on a complex project
- ›Describe how you've collaborated with cross-functional teams remotely
- ›Give an example of when you translated data insights into actionable recommendations
- ›How do you prioritise competing optimisation opportunities?
- ›Tell me about a challenging A/B test result you had to interpret
STAR answer examples
Model answers using the Situation-Task-Action-Result framework. Adapt to your own experience.
Tell me about a time you had to work autonomously on a complex project
Give an example of when you translated data insights into actionable recommendations