Client Success Manager (Marketing Effectiveness)

JR United Kingdom; Slough; On-site; GBP 50,000 - 80,000; Full time

Job summary

A leading global marketing effectiveness consultancy seeks a Client Success Manager in Slough. This role involves building client relationships and delivering high-quality analytics-driven solutions. The ideal candidate will have expertise in marketing effectiveness, be data-savvy, and ready to drive client success initiatives.

Qualifications

• Minimum 5 years in project management and client relationship management.
• Demonstrable expertise in data analytics and Marketing Mix Modelling (MMM).
• Strong understanding of marketing effectiveness.

Responsibilities

• Serve as the primary contact ensuring client satisfaction and retention.
• Facilitate successful outcomes and provide strategic business recommendations.
• Drive project processes managing multiple analytics-heavy client projects.

Skills

Client Relationship Management

Data Analytics

Problem-Solving

Attention to Detail

Communication

Job description

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Client Success Manager (Marketing Effectiveness), Slough

Client:

Gain Theory

Location:

Slough, United Kingdom

Job Category:

Other

EU work permit required: Yes

Job Views:

4

Posted:

10.06.2025

Expiry Date:

25.07.2025

Job Description:

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. Excellent problem-solving skills, attention to detail, and a proactive approach are essential.

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 be up-to-date with the latest trends and developments in marketing measurement. The ability to interpret complex data and analytical insights, including those derived from MMM, and present them clearly and concisely to clients, translating technical findings into strategic business recommendations, is crucial.

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, particularly in marketing effectiveness measurement and MMM best practices.
• Lead discussions on MMM results and their implications with clients.
• Support client growth initiatives and new business pitches, showcasing Gain Theory's analytical capabilities.
• Collaborate with analytics, data, and operations teams to ensure high satisfaction levels, acting as a key liaison.
• 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 through actionable MMM insights and improved marketing ROI
• Client advocacy, including awards and references
• Average annual client size
• Employee satisfaction within the client success team

Critical Capabilities

• Strong data and analytical interpretation skills, with proven experience in understanding and communicating MMM outputs and their business implications.
• Support in project and client relationship management, especially for analytics-heavy engagements.
• Knowledge of SOW oversight and risk management, understanding data and analytical project complexities.
• Commitment to quality assurance and best practices in delivering models and insights.
• Excellent communication and interpersonal skills to facilitate team collaboration and bridge technical 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.

We define ambitious brands as those generating above-average earnings/profits, and our mission is to accelerate their growth. Our services include:

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

At Gain Theory, we value curiosity, positivity, consideration, and continuous improvement. We are committed to diversity, equity, and inclusion, fostering a respectful environment for all.

Gain Theory is part of WPP. For more info, visit our website and follow us on LinkedIn and Twitter.

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