Senior Client Success Manager (Marketing Effectiveness)

JR United Kingdom; Slough; On-site; GBP 60,000 - 80,000; Full time

Job summary

A market effectiveness consultancy is seeking a Senior Client Success Manager in Slough to oversee client relationships and drive marketing effectiveness. The ideal candidate will have at least 5 years of experience in client relationship management, with a strong focus on data analytics and Marketing Mix Modelling (MMM). You will work closely with clients to provide strategic insights and recommendations based on analytical findings.

Benefits

Diversity and inclusion initiatives

Training and development opportunities

Qualifications

• Minimum of 5 years of experience in project management.
• Demonstrable expertise in data analytics and Marketing Mix Modelling (MMM).
• Ability to interpret data and present insights clearly.

Responsibilities

• Serve as the primary point of contact for clients.
• Facilitate successful outcomes to drive customer satisfaction.
• Collaborate with analytics and data science teams.

Skills

Data analytics

Client relationship management

Project management

Problem-solving skills

Communication skills

Education

5 years in relevant field

Tools

Marketing Mix Modelling (MMM)

Data visualization tools

Job description

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Senior Client Success Manager (Marketing Effectiveness), Slough

Client: Gain Theory

Location: Slough, United Kingdom

Job Category: Other

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EU work permit required: Yes

Job Views:

1

Posted:

22.08.2025

Expiry Date:

06.10.2025

Job Description:

Senior Client Success Manager (Marketing Effectiveness) required to work with multiple premier brands to provide first-class strategic client services. As a 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.

Role Description:

The Client Success Manager will report to the Client Success Director and work closely with the client leadership team to ensure optimal delivery and satisfaction. The ideal candidate should have a minimum of 5 years of experience in project management, client relationship management, and demonstrable expertise in data analytics, particularly within marketing effectiveness and Marketing Mix Modelling (MMM).

The candidate should be able to work in a fast-paced environment, manage multiple projects simultaneously, and prioritize tasks effectively. They should have excellent problem-solving skills, attention to detail, and a proactive approach to resolving issues.

The successful candidate should have a deep understanding of the Marketing Effectiveness and analytics industry, with specific knowledge of MMM methodologies, data requirements, and interpretation of model outputs. They should stay updated with the latest trends in marketing measurement. They should be able to interpret complex data and analytical insights, including those from MMM, and present them clearly and concisely to clients, translating technical findings into strategic business recommendations.

The Client Success Manager should be a team player with effective communication and interpersonal skills to collaborate with cross-functional teams, including analytics and data science teams.

Key Activities & Accountabilities:

• Drive optimal client project processes for work delivery and satisfaction, especially for projects involving advanced analytics and MMM.
• Deliver high-quality client materials aligned with strategic objectives, articulating analytical insights and MMM recommendations clearly.
• Contribute to team learning and knowledge sharing, focusing on marketing effectiveness measurement and MMM best practices.
• Lead discussions on MMM results and their implications as part of client engagement.
• Support client growth initiatives and new business pitches, highlighting Gain Theory's analytical capabilities and MMM expertise.
• Collaborate with analytics, data, and operations teams to ensure high satisfaction levels, acting as a liaison between clients and analytical delivery teams.
• Stay informed about new MMM techniques and industry benchmarks.

KPIs and Success Factors:

• Client Satisfaction: Performance, Preference, and Likelihood to Recommend
• Active Client Stakeholder Numbers
• Influence of Client Stakeholders
• Value Generated for Clients (demonstrated through MMM insights and improved ROI)
• Client Advocacy (willingness to recommend, provide references, awards)
• Average Annual Client Size
• Client Success Employee Satisfaction

Critical Capabilities:

• Strong data and analytical skills, with proven experience in MMM outputs and business implications.
• Experience in project and client relationship management, especially for analytics-heavy projects.
• Knowledge of SOW oversight and risk management, understanding data and analytical project scopes.
• Commitment to quality assurance and best practices, especially in analytical models and insights delivery.
• Excellent communication skills to bridge technical teams and business stakeholders.
• Support in financial analysis for budgeting and profitability, leveraging analytical findings for investment decisions.

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 empower our clients to make better investment decisions that drive growth.

Our vision is to accelerate growth for ambitious brands—those generating above-average earnings and profits. Our services include:

• Data strategy, harmonization, and visualization
• Advanced analytics including MMM, attribution, and unified measurement
• High-touch consultancy, bespoke roadmaps, training, benchmarking, and activation planning

We value curiosity, positivity, consideration, and continuous improvement. Learn more about our culture at our website.

We are committed to diversity, equity, and inclusion, fostering a respectful environment for all. As part of WPP, we aim to reflect our greatest asset—our people. Visit our website and follow us on LinkedIn and Twitter.

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