Global Client Commerce Partner in London

Mars UnitedSM Commerce is a global commerce marketing practice that aligns people, technology, and intelligence to make the business of our clients better today than it was yesterday. Our worldwide capabilities coalesce into four key disciplines — Strategy & Analytics, Content & Experiences, Digital Commerce, and Retail Consultancy — that individually deliver unmatched results for clients and collectively give them an unparalleled network of seamlessly integrated functions across the entire commerce marketing ecosystem. These disciplines are powered by our industry-leading technology platform, Marilyn, which helps marketers understand the total business impact of their commerce marketing activation, enabling them to make better decisions, create connected experiences, and drive stronger, measurable results.

We are hiring a Global Commerce Client Partner to lead and grow a key global FMCG client relationship within Mars United Commerce. This is a senior leadership role with real influence, combining strategic thinking, commercial ownership, and trusted client partnership across multiple markets. You'll shape integrated omni‐commerce strategies, guide high‐performing teams, and help clients navigate an evolving commerce landscape with confidence. If you enjoy building long‐term partnerships and delivering meaningful business impact, this role offers both scale and purpose.

What you'll be doing:

• Own and lead a global client relationship, acting as a trusted senior partner to regional and global stakeholders.
• Shape and deliver integrated omni‐commerce strategies across brand, shopper, retail media, and wider commerce disciplines.
• Lead annual business planning, scopes of work, and commercial performance across brands and markets.
• Oversee high‐quality delivery across multiple regions, ensuring work is insight‐led, strategically aligned, and delivered with operational rigour.
• Partner closely with finance leadership to manage revenue, forecasting, and sustainable margin performance.
• Identify and convert growth opportunities within existing client relationships, expanding scope and long‐term value.
• Lead, coach, and develop multi‐disciplinary teams, fostering a collaborative and inclusive culture.

Skills we're looking for:

• Significant experience in FMCG, retail‐focused marketing, or commerce roles, gained client‐side or agency‐side.
• Proven leadership of complex, multi‐market client relationships at a senior level.
• Strong understanding of omni‐channel commerce, including retail media, shopper marketing, and brand integration.
• Commercial and financial acumen, with experience owning revenue, forecasts, and profitability.
• Strategic thinking paired with the ability to turn complexity into clear, actionable plans.
• Confident communicator with strong stakeholder‐management and presentation skills.
• A collaborative leadership style, with a genuine interest in developing people and building strong teams.

Additional Information:

Mars UnitedSM Commerce offers a wide range of benefits to support our employees. Full details are shared when you join, but highlights include core benefits such as Pension, Life Assurance, and Private Medical cover, alongside enhanced policies like Reflection Days and Shared Parental Leave.

At Mars UnitedSM Commerce, we are proud to be an equal opportunities employer. We welcome and encourage applications from people of all backgrounds, and do not discriminate on the basis of race, ethnicity, nationality, religion or belief, disability, age, citizenship, relationship status, sexual orientation, gender identity, or any other protected characteristic. We are committed to providing a fair, accessible, and inclusive recruitment process. If you have any access needs – for example, related to disability, neurodivergence, or a health condition – please let us know. We'll work with you to ensure the process works for you. Sharing this information will never impact your application.

Guided by our values, we listen with empathy, uplift each other, take responsibility, and embrace change – building a culture where everyone feels seen, respected, and genuinely included.