Head of Performance Marketing

Who are OnBuy?

OnBuy are an online marketplace who are on a mission of being the best choice for every customer, everywhere. We have recently been named one of the UK's fastest-growing tech companies in the Sunday Times 100 Tech list. All achievements we are very proud of, but we don't let that go to our head. We are all laser focused on our mission and understand the huge joint effort ahead of us needed to succeed.

Working at OnBuy:

We are a team of driven and motivated people who thrive when working at pace. To succeed at OnBuy you need to take charge and fully own your responsibilities, rolling your sleeves up when needed to 'get it done'. Working at OnBuy you are surrounded by so much opportunity, but you must possess the ability to stay focused and prioritise ruthlessly. Most importantly, you will thrive in an ever-changing environment as we are constantly evolving. At OnBuy, you're not just a number or another cog in a machine. We are creating something really special, and you have the opportunity to affect meaningful change and have your voice heard. We are a close team, who have the opportunity to learn and grow as OnBuy evolves.

About the Role

We are hiring a Head of Performance Marketing to own and scale OnBuy’s performance marketing engine. This role is accountable for delivering GMV growth at target contribution across a ~£200m+ portfolio through segmentation, systems, data activation, and disciplined experimentation. This is not a brand marketing role. This is a trading + systems role focused on building a scalable growth engine.

What you Will Own

• Full ownership of performance marketing across Google Shopping, Bing, Affiliates (incl. CSS), CRM, and selected paid social channels.
• Google/Bing Shopping solution ownership, evolution, governance, and performance.
• Channel mix, budget allocation, and contribution guardrails.
• Propensity model activation: how predictive signals are tested, trusted, and operationalised.
• Measurement truth: incrementality, halo, MMM, attribution.
• Vendor and tooling strategy: controlled testing of platforms vs internal systems.
• Weekly GMV, contribution, and spend performance across all markets.
• Performance marketing team structure, hiring, and development.

Key Responsibilities

• Commercial & Strategic Leadership: Own GMV growth at target contribution across all performance channels and markets. Set channel mix, investment guardrails, pacing rules, and scaling strategy. Partner closely with Finance to forecast spend, GMV, and contribution/ROI.
• Segmentation & Activation: Define segmentation across department, margin band, seller ID, and performance tiers. Ensure segments are tested & activated across other channels (Channel activation strategy). Translate propensity and LTV models into activation.
• Channel Strategy: Shopping: segmentation, waste control, and reporting dashboards. Affiliates: partner strategy and contribution control. CRM: lifecycle strategy and retention growth. Leverage deals, app, retention strategy. Paid social: structured test-and-scale approach.
• Measurement & Experimentation: Own incrementality testing and attribution. Test, try, kill or adopt new growth channels. Publish monthly performance insights.
• Operating Model: Run weekly growth forums – The company has ambitious growth targets and WoW growth is now vital. Set guardrails, stop-loss rules, and alerts.
• Team Leadership: Lead Senior Shopping, Affiliates, and CRM manager. Build a lean, automation-focused team.

What This Role Is Not

• This is not a brand or ATL marketing role.
• This is not a passive stakeholder role.
• This is not an agency-management-only role. This role exists to build systems, drive growth, and deliver measurable outcomes.

Requirements

• Senior performance marketing leadership experience in ecommerce or marketplace environments.
• Deep practical expertise in Google Shopping and large-scale catalogue activation.
• Experience operating at scale in a large SKU environment.
• Strong understanding of incrementality, attribution, and experimentation.
• Deep understanding of segmentation and incrementality.
• Experience working alongside data science and engineering teams.
• Strong commercial and data-led mindset.
• International experience across UK and EU markets. US experience would be advantageous.
• Comfortable operating at both strategic and hands-on levels.
• Proven experience in leading a lean performance marketing team.

Benefits

The salary on offer for this role is £110,000- £130,000 + Significant Equity depending on experience. We also offer the following benefits:

• Company Equity - In return for helping us to grow, we’ll offer you company equity, meaning you own a piece of this business we are all working so hard to build.
• 25 days annual leave + Bank Holidays.
• 1 extra day off for your Birthday.
• Employee Assistance Programme.
• Perks at Work benefit platform.
• Opportunities for career development and progression.

This role is UK remote, or will be Hybrid if you live near our Manchester or Bournemouth's offices.

Our Commitment

OnBuy is an equal opportunities employer. We are dedicated to creating a fair and transparent workforce, starting with a recruitment process that does not discriminate on the basis of gender, sexual orientation, marital or civil partnership status, pregnancy or maternity, gender reassignment, race, colour, nationality, ethnic or national origin, religion or belief, disability, or age.

Just a heads up — we never use WhatsApp or any messaging apps to contact candidates. If someone reaches out this way, it isn’t us and let the recruitment team know.