Client Success Manager

Client Success Manager - 12-month FTC with potential to go perm

The Company

Our client is a well‑established advertising and media technology business operating across premium verticals including finance, business, technology and lifestyle. The company works with large, well‑known brands and has built a strong reputation for delivering measurable results through data‑led, performance‑focused advertising solutions.

The business operates globally, with teams across multiple international markets, and partners directly with advertisers as well as selected agencies. Client relationships are long‑term and retention‑driven, with a strong emphasis on transparency, accountability and commercial impact.

The Role

The Client Success Manager will take ownership of a portfolio of accounts, managing relationships end to end while overseeing campaign strategy, execution and performance.

This is a client‑facing, commercially focused role that spans campaign delivery, optimisation, reporting and account growth. You will work closely with internal sales, analytics, product and finance teams to ensure campaigns deliver against agreed objectives and identify opportunities to expand existing partnerships.

Campaigns are managed within the company's own platform, with a strong focus on performance, measurement and client outcomes rather than hands-on buying or trading.

Key Responsibilities

• Own and manage a defined book of advertiser accounts, acting as the primary point of contact

• Deliver and optimise multiple campaigns concurrently, ensuring performance against agreed KPIs

• Manage commercial aspects of accounts, including budgets, forecasts and ongoing revenue tracking

• Analyse campaign performance and translate data into clear, actionable insights for clients

• Identify and drive upsell and growth opportunities within existing accounts

• Collaborate closely with internal teams to ensure smooth campaign execution and client satisfaction

• Build trusted, long‑term client relationships focused on retention and sustainable growth

Experience Required

• Experience in client success, account management or campaign management within digital advertising, media or ad tech

• Proven track record managing multiple strategic client accounts simultaneously

• Strong commercial acumen, with experience discussing budgets, value and ROI with clients

• Comfortable working in a fast‑paced environment with competing priorities

• Strong analytical skills and confidence working with performance data and reporting

• Ability to communicate complex information clearly to both clients and internal stakeholders

• Highly organised, proactive and accountable

The Person

• Client‑first, consultative mindset

• Commercially confident and results‑driven

• Data‑led and comfortable using insights to influence decisions

• Collaborative and effective when working cross‑functionally

• Self‑starter who takes ownership and responsibility for outcomes

Apply

If you're interested in learning more about this role, please apply with your CV or get in touch for a confidential discussion.

Sphere Digital Recruitment currently have a variety of job opportunities across digital so feel free to get in touch with us to find out how we can help you. Please take a look at our website.

Sphere is an equal opportunities employer. We encourage applications regardless of ethnic origin, race, religious beliefs, age, disability, gender or sexual orientation, and any other protected status as required by applicable law.

If you require any adjustments or additional support during the recruitment process for any reason whatsoever, please let us know.