Head of Customer Experience; Seller

Position: Head of Customer Experience (Seller Experience)

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 On Buy

We are a team of driven and motivated people who thrive when working  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

The Head of Seller Experience owns the end-to-end Seller Journey and the commercial success of our seller base. You will define and deliver a strategy that makes it effortless and rewarding for sellers to onboard, trade, grow and thrive on our marketplace. This role leads our Seller-side Product Owners and partners across all aspects of our business to design intuitive seller experiences, unlock trading performance and ensure sellers maximise their success on our platform.

You will combine insight, design, commercial analysis and automation to drive simplicity, trust and measurable trading outcomes. You will champion the seller, create frictionless journeys and ensure our platform evolves in line with seller needs and marketplace opportunity. This is a strategic, insight-led and outcome-focused leadership role balancing Product Ownership, CX excellence and commercial growth.

Sellers are the beating heart of our marketplace. You will be the engine force that enables them to join, trade and scale with confidence. Through experience innovation, commercial discipline and insight-led leadership, you will shape the future of our marketplace and unlock sustainable global growth.

Key Responsibilities Strategy & Leadership

• Own the Seller Experience and Growth strategy across onboarding, trading, performance, and solutions
• Lead and coach Product Owners and Seller Experience teams, ensuring clarity of vision, prioritisation, and delivery
• Champion data-driven decision-making
  , design thinking, and behavioural insights as core levers
• Embed a culture of seller obsession and outcome-focused execution

Journey Ownership & Proposition Development

• Take ownership of the end-to-end Seller Journey
  , removing friction at every lifecycle stage
• Conduct journey mapping, research, and insight to create intuitive, scalable, and trust-building experiences
• Translate seller insights into clear propositions, product direction, and delivery priorities
• Partner with Technology to ensure platform maturity, reliability, and continuous improvement

Commercial & Trading Performance

• Drive seller lifecycle performance across activation, time to first sale, growth, retention, and satisfaction
• Collaborate with BI to build dashboards tracking seller performance, GMV contribution, and marketplace dynamics
• Identify opportunities in pricing, content, competitiveness, and assortment
• Define and implement segmentation strategies to tailor support and experience to seller value and potential

Automation & Operating Model Evolution

• Lead automation and AI workflows to enable scalable, proactive seller support and trading interventions
• Build digital-first seller management frameworks with targeted high-touch engagement where it matters
• Work cross-functionally to resolve systemic barriers and trading blockers quickly

Voice of Seller & Insight Systems

• Create and scale a Voice of Seller program with real‑time feedback loops and structured reporting
• Convert insights into clear actions, backlog prioritisation, and product decisions
• Deliver…