Client Development Manager in London

Company Description: Click here to view how Epsilon transforms marketing with 1 View, 1 Vision, 1 Voice.

Overview: How You’ll Make an Impact

We’re looking for a Client Development Manager to join our London‑based Commerce team. In this role, you will be responsible for driving incremental revenue growth through a Tier 1 B2B retail media partnership, with a particular focus on activating and scaling investment from the retailer’s long‑tail supplier base. This is a quota‑carrying position, with success measured by incremental revenue delivered from secondary markets and long-tail suppliers. Working with the commercial lead on the retailer partnership, you will own the end‑to‑end commercial engagement — from identifying opportunities, implementing processes, workflows and shaping scalable solutions, to ensuring delivery, reporting, and budget utilisation. This is a hybrid role based in our London office (4 days a week).

Responsibilities: What You’ll Achieve

• Uncover retailer business needs and translate them into scalable, turnkey commercial solutions that unlock incremental investment from long tail suppliers.
• Rapidly develop a strong understanding of the retailer’s B2B landscape, enabling efficient, low friction engagement that minimises effort required from the client.
• Build and maintain effective relationships with a high volume of stakeholders across both the retailer and its supplier ecosystem, creating meaningful engagement despite scale and complexity.
• Communicate the Epsilon Retail Media Network (RMN) value proposition clearly and credibly across diverse audiences, tailoring messaging in real time based on marketing knowledge and language capability.
• Lead and coordinate multiple internal cross teams to deliver against client commitments, managing upwards and laterally with confidence and clarity to ensure nothing falls through the cracks.
• Partner closely with project management resources to ensure seamless delivery, clear accountability, and consistent execution across all workstreams.
• Deliver timely proof of activity for all campaigns and initiatives eg. Reporting and screenshots.

Qualifications: Who You Are

What you’ll bring with you:

• 2 – 4+ years’ experience in consultative sales, marketing, or client management, gained client‑side, within ad solutions, direct marketing, or agency environments.
• Strong experience across core marketing disciplines, including strategy, analytics, media performance, and forecasting.
• Exceptional relationship‑building skills, with the ability to operate effectively across multiple seniority levels and stakeholder types.
• High levels of self‑motivation, with a proven ability to identify new opportunities, market gaps, and growth levers.
• Outstanding organisational capability, with the ability to bring structure and prioritisation to complex, fast‑moving environments.
• A solid quantitative mindset, with confidence using data, metrics, and analytical tools to inform decisions.
• Strong data storytelling ability — translating performance metrics into clear narratives, opportunities, and upsell recommendations, even when results are challenging.
• Great communication and inter-personal skills.
• Confidence working cross‑functionally with multiple internal teams to deliver outcomes that work for both the client and Epsilon.
• Advanced proficiency in Microsoft Office, including Excel and PowerPoint, alongside sales and CRM tools such as Salesforce.

Why you might stand out from other talent:

• Naturally people‑focused: credible, engaging, and effective at building trust quickly.
• Comfortable juggling multiple priorities without losing momentum, accuracy, or composure.
• Process‑driven and detail‑oriented, with experience in project management and the ability to build structured workflows that support scale and consistent delivery.
• Optimistic, resilient, and proactive, with a strong sense of ownership and a “can‑do” mindset.

Additional Information: When You Join Us, We’ll Create Something EPIC Together

Epsilon is a global data, technology and services company that powers the marketing and advertising ecosystem. For decades, we’ve provided marketers from the world’s leading brands the data, technology and services they need to engage consumers with 1 View, 1 Vision and 1 Voice. Epsilon’s comprehensive portfolio of capabilities across our suite of digital media, messaging and loyalty solutions bridge the divide between marketing and advertising technology. We process 400+ billion consumer actions each day using advanced AI and hold many patents of proprietary technology, including real-time modeling languages and consumer privacy advancements. Thanks to the work of every employee, Epsilon has been consistently recognized as industry-leading by Forrester, Adweek and the MRC. Epsilon is a global company with more than 9,000 employees around the world.

Our pillars aren't just words. They're how we show up every day.

• People centricity: We focus on employee well-being in an environment where colleagues truly care about each other.
• Collaboration: We work together, support one another, and collectively achieve goals.
• Growth: There are endless opportunities for growth through learning, development and career advancement.
• Innovation: We drive progress through cutting-edge solutions and forward-thinking approaches.
• Flexibility: We’ve created a balance between work and personal life, and we encourage adaptability to solve problems creatively.

Our values guide us to create value for our clients, our people and consumers.

• Act with integrity.
• Work together to win together.
• Innovate with purpose.
• Respect all voices.
• Empower with accountability.

These pillars and values are our foundation—shaping our culture, guiding our decisions, and uniting us in common purpose.

Because You Matter

We know that we have some of the brightest and most talented employees in the world, and we believe in rewarding them accordingly. If you work here, expect competitive compensation, a great benefits package and endless opportunities to advance your career.

We offer hybrid working opportunities, with our office space located in the Iconic Television Centre, White City. As part of our dedication to enhance our inclusive and diverse workforce, Epsilon is committed to equal access to opportunity for people without regard to race, age, sex, disability, neurodiversity, sexual orientation, gender identity, pregnancy and parental, marriage and civil partnership or religion or belief. We are committed to providing reasonable adjustments for candidates in our application process.