Client Success Partner (12 month FTC)

Company: Gain Theory

Location: London

Posted: May 15th, 2026

Client Success Partner required to join our client leadership team on a 12-month FTC. 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 extensive experience in the marketing effectiveness or analytics industry.


What You'll Be Doing:


What You'll Bring:


Your Impact Will Be Measured By:


Key Relationships You'll Build:


Who we are & what we do:

Gain Theory is a leading global marketing effectiveness and foresight consultancy. We combine quality data, proprietary technology, and advanced analytics to give our clients the confidence to make better-informed investment decisions that drive growth.


We deliver:


At Gain Theory, we love accelerating growth for our people. As a Gain Theorist, you will need to demonstrate behaviours which support our values.


Our values are: Be Curious, Be Positive, Act with Consideration and Make it Better. You can read more about our values here: www.gaintheory.com/our-culture-people-and-value

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