Senior Performance Marketing Contractor - Google Shopping & Bing

Who are OnCommerce?

OnCommerce is a global selling platform that powers a growing network of retail channels, including:

· OnBuy  - The only marketplace in the world to give customers instant Cashback on everything

· easyShop  - An all-new marketplace created in collaboration with the easy® family of brands

· Comet  - The iconic UK tech brand making its return later this year

OnCommerce is growing fast, launching new brands and scaling to power the future of ecommerce.

Be Part of the Story

OnCommerce is constantly evolving. Everyone here plays a hands-on role in shaping what comes next, building brands that make an impact across global markets. There’s no red tape or rigid corporate structure; just smart people taking ownership and figuring things out as we build something big together. The pace is fast, priorities shift, things aren’t always perfectly set up, and you’ll often need to get stuck in and solve problems. But if you thrive in that kind of environment, you’ll have real influence, real ownership, and the chance to grow with a rapidly scaling business.

About the role

Senior Shopping Manager
As the Senior Shopping 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 Centre 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 Centre & Diagnostics

• Own full Merchant Centre 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 operationalise 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 revenue tracking systems.
• Ensure structure and tracking changes are documented, measurable, and repeatable.
• Partner with Data Science to operationalise propensity segmentation.

· Own end‑to‑end conversion tracking integrity, including server‑side conversions API, GTM audits, feed attribution, and ongoing monitoring of tracking capture rates vs internal GMVVendor, Automation & Partner Governance

· Manage and commercially challenge third‑party Shopping vendors and automation partners, including audit of bidding decisions, versioned change‑history accountability, and validation of performance claims

Requirements

Experience and Skills: 

Essential

· True super‑expert in Google Shopping & PMax: priorities, campaign types, listing groups, negative logic, feed rules, schema versioning, MC troubleshooting.

· Deep Merchant Center expertise.

· Experience operating in a multi‑million SKU marketplace environment

· Confident with contribution-based optimisation and rapid trading cycles.

· Strong analytical capability and comfort with experimentation.

· Hands‑on experience in e‑commerce/marketplace environments.

Desirable

· Familiarity with profitability modelling or dynamic pricing.

· Experience with BI tools or SQL.

· Experience with automation (scripts, feed tools).

Benefits

This role is Hybrid 3 days a week from either our Manchester or Bournemouth's offices. Please let us know your daily rate on application.

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.