Client Success Partner (12-month FTC)

About WPP

WPP is the trusted growth partner for the world’s leading brands. We unite cutting-edge media intelligence and data solutions, world-class creativity, next-generation production, transformative enterprise solutions and expert strategic counsel in a single company – powered by exceptional talent and our agentic marketing platform, WPP Open, to help our clients navigate change, capture opportunity and deliver transformational growth. For more information, visit WPP.com.

The opportunity:

An inspiring and strategic Client Success Partner to join our client leadership team. This is a pivotal role where you'll champion client satisfaction, drive profitable client revenue growth, and foster a thriving, engaged team environment.

You are a data-driven and results-oriented leader with exceptional communication, leadership, and problem-solving skills, capable of serving as a strategic advisor and trusted partner to senior client stakeholders.

You will have 10 years + experience in the marketing effectiveness or analytics industry.

What you’ll be doing:

• Elevating Client Delivery & Insights: You'll translate complex data into clear, impactful insights for senior clients, leading your team of five individuals plus more dotted line relationships to deliver projects on time, scope, and budget, with robust quality assurance. You'll champion data storytelling and optimize client value from our tools.


• Driving Profitable Client Growth: You'll achieve client growth targets, identify new opportunities, and ensure profitability by proactively managing scope and efficiency. This includes leading new business pitches and demonstrating the tangible value we deliver.


• Cultivating Strategic Client Relationships: You'll build and expand strong relationships with senior client stakeholders, manage scope effectively, and proactively mitigate risks to enhance overall client satisfaction and advocacy.


• Embodying Thought & Values Leadership: You'll maintain deep knowledge of our offerings and the wider industry, serving as an inspirational leader who embodies Gain Theory's values. You'll foster collaborative learning and drive high satisfaction within your Client Success team.

What we want from you:

• Proven Leadership: Experience leading and mentoring client-facing teams to achieve high performance and satisfaction.


• Exceptional Data Acumen: A strong ability to interpret complex data, translate it into clear insights, and deliver impactful data storytelling to senior audiences.


• Strategic & Commercial Mindset: A track record of driving profitable client growth, managing budgets, identifying value opportunities, and contributing to new business acquisition.


• Client Relationship Mastery: Demonstrated success in building and nurturing strong, trust-based relationships with senior client stakeholders, expanding influence, and ensuring high satisfaction.


• Project & Financial Management: Expertise in managing complex projects, scope, and financial performance effectively.


• Industry Knowledge: Deep understanding of marketing effectiveness, analytics, and relevant industry trends, coupled with a keen interest in clients' specific industries.


• Values Alignment: A natural inclination to embody and promote our core values: Be Curious, Be Positive, Act with Consideration, and Make it Better.

 Your Impact Will Be Measured By:

• Exceptional client satisfaction (Performance, Preference, Likelihood to Recommend).


• Achieving net sales growth targets.


• Expansion and deepening of active client stakeholder relationships with increased influence and advocacy of client stakeholders.


• Demonstrable and substantial value generated for our clients.


• High satisfaction within your Client Success team.

 Key Relationships You'll Build:

• Clients


• Client Success Group & Executive Leadership Team


• The Gain Theory Data, Analytics and Operations community, plus New Business and Strategy teams

Why work for us? 

Gain Theory is committed to actively building a diverse, equitable and inclusive workplace where everyone feels welcomed, valued and heard, and is treated with dignity and respect.  As leaders and creative partners across industries, it is our responsibility to cultivate an environment reflective of our greatest asset; our people. We believe that this commitment inspires growth and delivers equitable outcomes for everyone as well as the clients and communities we serve. 

What we pride ourselves on: 

• Growth and development


• Meaningful work


• Flexible by design


• Brilliant benefits 


• Culture with Heart

Our exceptional and skilled team defines Gain Theory. That's why we seek individuals who strive for excellence and continually challenge us to improve.

What we do 

 As a WPP consultancy, Gain Theory also has access to a range of data, expertise, and tools that create a truly differentiated offering. 

 Gain Theory is a WPP agency (NYSE: WPP).      

 Who we are 

We are a people-centric organisation whose culture is underpinned by 4 important values: Be Curious, Be Positive, Make it Better and Act with Consideration. We channel these values through our behaviours, in the way we work, and in the interactions we have with each other and our clients. 

WPP (Gain Theory) is an equal opportunity employer and considers applicants for all positions without discrimination or regard to characteristics. We are committed to fostering a culture of respect in which everyone feels they belong and has the same opportunities to progress in their careers. 

Gain Theory is part of WPP. For more information_, please visit please visit our website and follow Gain Theory on our social channels via LinkedIn and Twitter.

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