Seller Trading Manager

OnBuy Seller Trading Manager

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 Deloitte's Technology Fast 50 for the third year in a row (as well as 'Fastest-Growing Tech Business in the South West').

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.

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 prioritize 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. We work in a flexible way, meaning we can prioritize our health and relationships, but when we are working, we graft.

Trading is the engine that drives marketplace growth. This role sits at the front of that engine by ensuring our catalogue is accurate, competitive and ready to convert. By leading seller data quality and uncovering the trading gaps that impact price, range, visibility and conversion, the Seller Trading Manager unlocks seller performance and powers high-quality, profitable growth. Their insights directly move GMV, strengthen contribution, and fuel the flywheel of buyer satisfaction and seller success across all markets.

About the Role

The Seller Trading Manager owns the quality, competitiveness and visibility of our marketplace catalogue across the UK and International Markets. The primary responsibility is to ensure seller data is accurate, enriched and fit for purpose, and to turn that high-quality data into clear, actionable trading insights.

This role does not directly execute seller-facing actions. Instead, it generates a structured pipeline of opportunities e.g. content fixes, pricing gaps, availability issues, GTIN / GS1 integrity, search visibility improvements that are passed to Seller Success and Sales to activate in line with our Lead Scoring Methodology.

What You'll Own

Catalogue Quality Leadership : End-to-end governance of seller data quality across regions; enforce accept / optimise / suppress / return rules and uphold gold standards for images, titles, attributes, GTINs / GS1, encoding, and de-duplication.

• Taxonomy & Mapping : Define and maintain taxonomy, category hierarchy, product mapping, and catalogue segmentation; ensure international readiness (language, symbols, encoding).
• Trading Insights : Analyse visibility, search rank, competitiveness, conversion, GMC health, and availability; generate structured opportunity packets (issue, action, size of prize) for Seller Success & Sales; prioritize via Trading Score, Lead Score, and propensity signals.
• Search & Discoverability : Remove ghost products and fix mis-categorisation; improve search / browse relevance through data and mapping; set surfacing / suppression / boosting rules based on competitiveness and data quality; partner with Buyer Experience & Tech on ranking logic and filters.
• Pricing Accuracy & Competitiveness : Maintain accurate regional pricing; detect market misalignment; segment inventory (KVI, premium, long-tail, substitution-sensitive); surface pricing-led trading actions for commercial teams.
• Feature Brand Management (UK / EU) : Ensure top brands meet standards for content, GTINs, compliance; lift visibility and conversion using data signals; collaborate with Marketing on discovery, merchandising, and campaigns.
• GMC Readiness : Guarantee catalogue compliance with Google Merchant Center requirements; reduce disapprovals, grow impression share, and mine GMC data for further optimisation.