Online Growth Marketing Manager

Company: Got The T-Shirt
Apply for the Online Growth Marketing Manager
Location: Leeds
Job Description:

Online Growth Marketing Manager (In digital agency growing their data team)

Team: Data

Reports to: Head of Data

Location: Leeds

Type: Full-time, hybrid / flexible working

Salary: £30,000 to £45,000 DOA

About the Role

We’re looking for an Online Growth Marketing Manager to join the Data team in a leading digital agency and lead experimentation strategies that drive measurable improvements for our clients’ websites and apps. Working closely with Digital Analysts and cross-functional teams, you’ll design and deliver data-driven optimisation strategies based on detailed analysis and post-test insights. Your work will focus on improving conversion rates through structured testing, statistical analysis, and continuous experimentation. This role requires a systematic and analytical mindset, using industry-leading tools to develop and execute A/B testing strategies. You’ll collaborate with data specialists, experience design teams, and client stakeholders to maximise performance and deliver meaningful results.

Key Responsibilities

  • Conversion Optimisation
    • Improve and optimise client conversions through data-driven ideation, execution, reporting, and analysis.
  • Experimentation & Testing
    • Run A/B tests and experimentation programmes, developing hypotheses and recommendations for website improvements.
    • Use qualitative and quantitative research to inform testing strategies.
  • Quality Assurance
    • QA test implementations before client previews to ensure accuracy and alignment with hypotheses.
  • Reporting & Insights
    • Report results, findings, and learnings to stakeholders and marketing managers.
    • Provide actionable insights and recommendations to support client KPIs and performance targets.
  • Continuous Optimisation
    • Deliver ongoing recommendations to improve user experience and website performance through continuous testing.
  • Cross-Team Collaboration
    • Work closely with other marketing teams (e.g. SEO and PPC) to align optimisation strategies with wider marketing activity.
  • Stakeholder & Client Engagement
    • Present testing performance and strategy in internal meetings.
    • Participate in client calls, meetings, and presentations.
    • Deliver pre-campaign, mid-campaign, and post-campaign analysis.
  • Additional Duties
    • Support wider business needs where required, including training and additional tasks assigned by your manager.

Knowledge, Technology & Qualifications

  • Degree in a relevant field or equivalent experience (e.g. Mathematics, Science, Research, Statistics, Marketing, Advertising).
  • Experience designing and executing A/B testing and experimentation programmes.
  • Familiarity with testing platforms such as Optimizely, VWO, Webtrends.
  • Experience with analytics platforms such as Google Analytics.
  • Basic knowledge of HTML, CSS, and JavaScript is beneficial.

Skills & Competencies

  • Ability to use analytics, customer experience data, and research insights to drive experimentation strategies and conversion improvements.
  • Ability to quality assure CRO campaigns and ensure high standards and timely delivery.
  • Strong written and verbal communication skills with the ability to clearly present ideas and insights.

Personal Attributes

  • Proactively challenges the status quo to drive improvement.
  • Collaborates effectively across teams to achieve shared success.
  • Open to new ways of working, ideas, and perspectives.
  • Curious and proactive in learning new skills and industry developments.

Benefits

  • 25 days holiday (+bh) increasing yearly to 30
  • Birthday off
  • Flexible working
  • Life assurance and salary sacrifice pension
  • Volunteering and wellbeing portal, perkbox discounts

Got what it takes to own this fantastic role? Apply now!

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Posted: May 17th, 2026