Remote Senior Performance Marketing Manager; Google Shopping & Bing

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  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
In this newly created role as Senior Performance Marketing Manager your primary responsibility is to maximise incremental GMV and contribution from Google & Bing Shopping/PMax through world‑class campaign architecture, feed intelligence, and efficiency control. Success is measured in incremental revenue and contribution/day, not ROAS. You are OnBuy’s deep technical expert across Google Shopping, Bing Shopping, Search, and PMax. You own and design the entire Shopping ecosystem end‑to‑end: structure, segmentation, labels, feed quality, bidding logic, Merchant Center health, and commercial optimisation.

This is a hands‑on individual contributor role, not a strategist position.

Key Responsibilities:

Shopping & PMax Architecture Ownership

• Own the full Shopping & PMax architecture, including:
• Campaign tiers & priorities
• Listing group design
• Custom label frameworks
• Negative structures
• Feed‑driven segmentation

• Ensure structural scalability across tens of thousands of campaigns and millions of SKUs, including automation of campaign creation, routing, and lane governance.”

• Control the interplay between PMax and Standard Shopping, ensuring optimal margin, traffic shaping, and signal control.
• Design and maintain complex, feed‑driven segmentation frameworks for millions of SKUs, including product eligibility tiers, performance cohorts, and commercial signals.
• Architect and manage multiple optimisation environments to ensure clean Smart Bidding signals, scalable growth across product groups, and controlled exploration.
• Own CSS account strategy including bid separation logic, feed‑exclusion rules, and optimisation of commission/auction mechanics.

Feed, Merchant Center & Diagnostics

• Own full Merchant Center health: schema, feed rules, disapprovals, diagnostics, and error remediation.
• Build and maintain advanced labelling systems for commercial signals, product scoring, seller quality, and activation logic
  
  Translate commercial conditions (margin, fee bands, seller activation) into schema logic.

Contribution & Incrementality Optimisation

• Optimise towards incremental GMV and contribution, not ROAS.
• Use propensity modelling outputs, EXTA parameters, decile segmentation, and SKU-level economics to shape structure and bids.
• Lead the Daily Trading Room: identify opportunities, isolate issues, and deploy rapid interventions.
• Work with Data/BI teams to ope rationalise performance‑based product movement rules, activation logic, and automated routing systems that dictate bidding exposure

Efficiency & Wastage Reduction

• Own wastage elimination across:
• Query sculpting
• Negative structure hygiene
• Asset group discipline
• Budget pacing rules
• Low-value SKU suppression
• Implement robust recovery and oxygen playbooks for campaigns requiring stabilisation.
• Own campaign‑lane health: monitor lane density, merge/split structural segments as needed, and maintain strong learning conditions across very large SKU sets

Measurement & Technical Leadership

• Own and improve tracking approaches across PMax, Shopping Profit frameworks, and…