Client Success Associate (Retail Media) in London

London (4 days per week in office) • UK travel to retailer offices as needed

Epsilon is offering an outstanding opportunity to work with some of the most inquisitive people in retail media and supporting some of the UK's biggest retailers. We are looking for a diligent Client Success Associate to support our Retail Media clients. You'll assist the Client Lead and the client team by coordinating delivery and keeping day-to-day tasks on track. You will also help drive commercial growth and product adoption onsite, offsite, and through features for our retail clients. Reporting and operational foundations will be carried out consistently and accurately.

Reporting & collaboration

You'll report directly to the lead of Client Services and support the wider Retail Media Client team. You'll partner closely with internal teams (e.g., Sales, Ops, Tech, Analytics, Creative) to support planning, delivery, reporting and issue resolution.

Responsibilities

• Support the Client Lead/Client Directors with meeting prep, notes, follow-ups and action tracking
• Support onsite operational checks and troubleshooting (e.g., platform checks, placement/feature launch coordination)
• Support product/release communications by helping compile client updates and key changes
• Build and QA retailer-facing reporting (weekly/monthly), including insights and next steps
• Raise and handle tickets (e.g., reporting pulls, troubleshooting, platform issues) and coordinate cross-functional follow-up
• Respond to client queries and triage requests, pulling in the right teams quickly
• Pull and maintain delivery metrics and trackers; help find opportunities to automate repeatable outputs
• Deliver comprehensive insights for retailer QBRs and ad hoc updates

What success looks like

• The team trusts you to keep details organised, deadlines met, and comms clear
• Issues are spotted early and raised with proposed options
• Reporting is accurate, on time, and passionate about insights and actions
• Trackers and processes are maintained to a high standard

Qualifications

• Strong organisation and follow-through; able to handle multiple workstreams
• Clear written and verbal communication; confident with client-facing updates
• Analytical and detail-focused; comfortable working with performance data in Excel
• Participant coordination across internal teams and retailer/platform contacts
• Proactive problem-solving

Required qualifications

• 1–2 years' experience in client services/account support within digital media, or an agency environment
• Strong Excel skills (pivots/lookups a plus) and ability to QA numbers before sharing
• Comfortable producing decks and written updates (PowerPoint)
• Able to work four days each week from our London office, with visits to retailer offices across the UK as required
• Proactive, team-first approach with strong ownership and vitality

Nice to have

• Hands‐on familiarity with retail media platforms (e.g., CitrusAd, Criteo Retail Media, Amazon)
• Experience with CRM/workflow tools (e.g., Salesforce) and basic analytics tooling (e.g., DOMO, Tableu)
• Comfortable presenting performance updates
• Retail/eCommerce trading knowledge (e.g., promo cadence, onsite merchandising)

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.