Contract Client Success Manager (Marketing Effectiveness)

Contract Client Success Manager required to work with multiple premier brands to provide first class strategic marketing effectiveness services. As a Contract Client Success Manager, you will be the primary point of contact for our clients, ensuring they derive maximum value from our products/services. Your role will involve building strong relationships, understanding client needs, and facilitating successful outcomes to drive customer satisfaction and retention.

About the Role:

We are seeking a data-savvy and customer-focused Client Success Manager (CSM) to lead strategic engagements with clients by leveraging Marketing Mix Modeling (MMM) insights. In this role, you will act as a trusted advisor, helping clients extract actionable value from their marketing data, optimize their media spend, and improve overall marketing performance through MMM-driven recommendations.

Key Responsibilities:

• Client Relationship Management: Own and nurture long-term relationships with a portfolio of enterprise-level clients.
• Insight Delivery: Translate complex MMM outputs into clear, compelling, and actionable insights that drive marketing decisions.
• Strategic Guidance: Advise clients on media allocation, ROI optimisation, and budget planning based on model results and performance benchmarks.
• Reporting & Presentation: Create and deliver presentations, dashboards, and summary reports that align with client business objectives.
• Cross-functional Collaboration: Work closely with data science, analytics, and product teams to ensure accurate, timely delivery of MMM results.
• Upsell & Retention: Identify opportunities to expand account value by demonstrating ROI and aligning MMM capabilities with client priorities.
• Feedback Loop: Collect client feedback to guide product enhancements and model improvements.

Qualifications:

• 3–6 years of experience in client-facing roles, preferably in marketing analytics, consulting, or SaaS.
• Strong understanding of Marketing Mix Modelling or similar media measurement methodologies (e.g., MTA, attribution modelling).
• Exceptional storytelling skills, with the ability to explain complex analytical concepts to non-technical stakeholders.
• Proven track record of managing senior client relationships and delivering value from data products or services.
• Proficiency with tools like Excel, PowerPoint, Tableau/Looker, and a basic understanding of statistical concepts.
• Comfortable working with cross-functional teams in a fast-paced environment.

Preferred Qualifications:

• Experience working at or with media agencies, marketing analytics platforms, or MMM providers.
• Knowledge of digital and traditional media channels and performance metrics.
• Familiarity with Python, R, or SQL is a plus (for understanding or interpreting model outputs).

Why Join Us:

• Opportunity to work at the intersection of data, strategy, and marketing .
• Help top-tier brands make smarter, data-driven decisions.
• Dynamic and inclusive culture focused on growth, collaboration, and innovation .

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.

Growth is the defining characteristic of successful organisation and Gain Theory’s vision is to accelerate growth for ambitious brands. We define ambitious brands as those that generate earnings/profits that are above the industry average.

We deliver:

• Data strategy, harmonization, and visualization.
• Advanced analytics and modelling, including MMM (Marketing Mix Modelling), attribution and unified measurement, testing, segmentation, behavioural sciences, choice analytics, simulation, war gaming and forecasting.
• High-touch consultancy that includes bespoke roadmaps, training and education, industry benchmarking and activation planning.

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:

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.

Gain Theory is a WPP-owned consultancy. 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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