Seller Onboarding Manager

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

About the Role
As the Seller Onboarding Manager, you will be the owner of the onboarding experience for all new sellers joining OnBuy. This is not just a support role it’s a business-critical function that connects seller experience to commercial outcomes. You will work cross-functionally to identify friction, drive improvements, and deliver scalable solutions that accelerate seller success and platform growth. Success means demonstrating the ability to connect operational execution with strategic impact, an essential trait for OnBuy.

The ideal candidate will be a cross-functional collaborator, passionate about enabling sellers to thrive on our platform.

Key responsibilities

• Seller Advocacy & Strategic Ownership
• Act as the internal advocate for new sellers, surfacing feedback and pain points to improve the onboarding experience.
• Support the Head of Sales in managing the onboarding funnel from activation through to retention.
• Collaborate with Product and Tech teams to influence roadmap priorities and resolve systemic onboarding blockers.
• Recommend tooling, automation, and product enhancements that improve onboarding efficiency and seller satisfaction.

Onboarding Process Management

Ensure timely completion of all critical onboarding steps, including:

• Account verification
• Integration method selection (Manual, ERP/API, CSV)
• International listing setup
• Shipping rate validation
• Product data quality checks
• Price competitiveness
• Boost and package education
• Brand registration
• Document onboarding progress in Salesforce and create educational content to proactively prevent common seller errors.

Integration & Product Activation

• Incentivise sellers to list best-selling SKUs immediately post-activation.
• Provide tailored support for ERP/API and CSV integrations, including documentation and troubleshooting.
• Collaborate with B2C Marketing to ensure SKU activation within the first month of onboarding.

Retention & Seller Satisfaction

• Design onboarding engagements that promote long-term seller retention.
• Partner with Sales, Support, and Product teams to proactively address early churn signals.
• Maintain a 90% satisfaction rate among strategic sellers through personalised support and feedback-driven improvements.
• Implement and manage onboarding satisfaction surveys in collaboration with B2B Marketing.

Scalable Onboarding & Automation

• Balance high-touch onboarding for strategic sellers with scalable processes for the broader seller base.
• Leverage automation and AI tools to reduce manual effort while preserving personalisation.
• Continuously refine onboarding workflows based on performance data, seller feedback, and internal insights.
  

Performance Monitoring & Reporting

•   Monitor onboarding KPIs and integration milestones to track progress and identify areas for improvement.
•   Identify trends in delays or drop-offs and implement root-cause solutions.
•   Provide regular updates to leadership on seller progress, onboarding performance, and program effectiveness.

Experience & Skills

•          Background in sales, customer success, or account management—ideally within e-commerce or marketplaces.
•          Experience working with cross-functional teams such as Product, Engineering, or Marketing.
•          Strong interpersonal skills and a natural ability to build relationships quickly.
•          Comfortable using AI and automation tools to improve efficiency.
•         Analytical mindset with the ability to solve problems using data and feedback.
•          Excellent time management and task prioritisation skills.
•         Clear and confident communicator—both in person and when creating guides or content.
•          Proactive, results-driven, and comfortable taking initiative.
•          Familiarity with ERP systems (e.g., Linnworks, Rithum) and seller integrations.
•         Understanding of e-commerce platforms and seller challenges is a plus.
•          Experience with CRM tools like Salesforce or a willingness to learn.
•        Able to switch between strategic thinking and hands-on execution with ease.

The salary on offer for this role is £30,000 - £40,000 per annum, depending on experience + commission

We also offer the following benefits:

• 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

Plus 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.

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.