Ecommerce Client Manager

10 month fixed term contract (London / Hybrid)


About the team
Nectar360 sits at the heart of Sainsbury’s retail media and loyalty ecosystem, focused on creating a brilliant digital experience for customers shopping online. We’re a fast-growing, dynamic team powering supplier‑funded campaigns across Sainsbury’, the Sainsbury’s App and OnDemand channels—helping brands connect with customers at the moments that matter. Working as part of our Digital Media function, you’ll collaborate with talented colleagues across trading, digital trading and ad operations to deliver best-in-class execution and measurable impact.

More about the role
As an Ecommerce Client Manager, you’ll be accountable for the end-to-end management and delivery of supplier-funded media activations across your business unit on Groceries Online (GOL). You’ll work within defined trading and planning guardrails to drive supplier investment, optimise spend, and track performance against commitments—ensuring activity aligns to supplier activation plans and delivers excellent execution.

Day to day, you’ll partner closely with category suppliers and internal stakeholders to review performance, investment and strategy, while working with ad operations teams to ensure campaigns are activated and optimised effectively on our ecommerce media platform. You’ll also play a key role in educating and upskilling colleagues on GOL media, contributing to the ongoing development of a profitable, customer‑focused media proposition that protects the customer journey. You’ll provide regular updates to the Ecommerce Client Director and Senior Ecommerce Client Manager on client performance, project delivery and revenue status, supporting shared priorities and smooth delivery.

More about you
You’re highly organised and methodical, comfortable managing multiple workstreams in a fast-paced and sometimes ambiguous environment, while maintaining strong attention to detail—especially when working with data and analytics tools. You bring a solid foundation in client management (ideally within retail or FMCG), combining analytical and numerical capability with clear communication and presentation skills that build trust with internal and external stakeholders.

Commercially minded and strategically aware, you can align plans to broader business objectives, negotiate effectively to balance competing priorities, and deliver to deadlines. You take ownership, proactively spot risks and opportunities, and collaborate across teams—often through matrix ways of working—to drive outcomes against client objectives and revenue targets. You’re also committed to continuous development and happy to stretch beyond your comfort zone as you grow within the role.

Essential criteria (up to 5)
Demonstrable experience managing end-to-end delivery of supplier-funded ecommerce media activations (briefing, activation, optimisation and post-campaign review).
Proven ability to track spend and performance against agreed commitments using data and analytics tools, and turn insights into clear recommendations.
Evidence of building productive relationships with suppliers and internal stakeholders (., trading/digital trading) to align plans and prioritise activity.
Experience working with ad operations teams to ensure campaigns are activated accurately and optimised effectively on an ecommerce media platform.
Ability to manage multiple concurrent workstreams to deadline within defined guardrails, providing clear status updates on performance, delivery and revenue.

#LI-DN1

We’d all like amazing work to do, and real work-life balance. That’s waiting for you at Sainsbury’s. Everything our Nectar team does is powered by data and by strong relationships with some of the UK’s favourite brands. The Nectar360 team develops loyalty programmes, turning insight into something that makes a real difference, across both traditional and digital media. It’s like an agency within a retailer, and retail media is a crucial part of our future. The culture might not be what you expect either, because there’s no setup quite like this one. The team is a real priority, connected to almost everything the business does and playing a key role in driving profitability. It’s a place where you can take risks, learn from them, and be recognised.

We are committed to being a truly inclusive retailer, so you’ll be welcomed whoever you are and wherever you work. Around here, there’s always the chance to try something new - whether that’s as part of an evolving team or somewhere else across the business - and we take development seriously and promise to support you. We also recognise and celebrate colleagues when they go the extra mile and, where possible, offer flexible working. When you join our team, we’ll also offer you an amazing range of benefits. Here are some of them:

Starting off with colleague discount, you'll be able to get 10% off at Sainsbury's, Argos, TU and Habitat after 4 weeks. This increases to 15% off at Sainsbury’s every Friday and Saturday and 15% off at Argos every pay day. We've also got you covered for your future with our pensions scheme and life cover. You'll also be able to share in our success as you may be eligible for a performance-related target bonus of up to 10% of salary (which may vary for Nectar360), depending on how we perform.

Your wellbeing is important to us too. You'll receive an annual holiday allowance and you can buy additional holiday. We also offer other benefits that will help your money go further such as season ticket loans, cycle to work scheme, health cash plans, pay advance (where you can access some of your pay before pay day) as well access to a great range of discounts from hundreds of other retailers. And if you ever need it there is also an employee assistance programme.

Moments that matter are as important to us as they are to you which is why we give up to 26 weeks’ pay for maternity or adoption leave and up to 4 weeks’ pay for paternity leave.

Please see for a range of our benefits (note, length of service and eligibility criteria may apply).