Client Development Manager

Company Description See how Epsilon powers connected marketing by unlocking the full potential of data and identity. 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)

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

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.

When you join Epsilon, we’ll create something EPIC together. We’re a global leader in data and identity, with deep expertise in digital media, clean rooms, customer data platforms, loyalty and marketing services. Positioned at the center of Publicis Groupe, Epsilon helps brands deliver personalized experiences at scale and build lasting customer relationships by unlocking the full potential of data and identity. Epsilon operates in 30+ countries across EMEA, the Americas and APAC, with more than 8,000 employees. Check out a few of these resources to learn more about what makes Epsilon so EPIC:

https://www.epsilon.com/us/about-us/our-culture-epsilon Life at Epsilon: https://www.epsilon.com/us/about-us/epic-blog Epsilon has five values that define our culture and guide us as we create value for our clients, our people and consumers. We seek candidates who align with our company values, demonstrate them and make them meaningful in their day-to-day work: Act with integrity. We are transparent and have the courage to do the right thing. Work together to win together. We believe collaboration is the catalyst that unlocks our full potential. Innovate with purpose.

We shape the market with big ideas that drive big outcomes. Respect all voices. We embrace differences and foster a culture of connection and belonging. Empower with accountability. We trust each other to own and deliver on common goals. 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. #LI-TF1 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 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.