Find a job 
Featured Companies 
Featured Universities 
For Companies At a Glance
- Tasks: Lead client partnerships and drive marketing effectiveness through data-driven strategies.
- Company: Gain Theory is a global leader in marketing effectiveness, empowering brands to accelerate growth.
- Benefits: Enjoy a collaborative culture, mentorship opportunities, and the chance to influence high-level marketing decisions.
- Why this job: Join a dynamic team focused on client success and innovative marketing solutions that make a real impact.
- Qualifications: 8+ years in client leadership roles with expertise in marketing analytics and proven results.
- Other info: Be part of a company that values curiosity, positivity, and continuous improvement.
The predicted salary is between 54000 - 84000 £ per year.
Job Description
As Client Success Senior Director, you will play a pivotal role in delivering client excellence and driving marketing effectiveness. You will lead client partnerships across key accounts, acting as a strategic advisor who champions analytics-driven marketing performance.
This role requires a strong blend of leadership, commercial acumen, and deep marketing measurement expertise. You will work closely with senior client stakeholders, helping them unlock growth through data-led decisions, advanced analytics, and actionable insights.
Key Responsibilities
Client Leadership & Strategic Impact
- Serve as the senior point of contact for client executives, shaping and delivering marketing effectiveness strategies that align with their business goals.
- Champion the use of advanced analytics (MMM, attribution, testing) to influence high-value marketing decisions and demonstrate ROI.
- Translate complex insights into clear, actionable narratives that drive client confidence and stakeholder buy-in.
- Expand client relationships by identifying new opportunities and embedding Gain Theory’s marketing effectiveness frameworks into their strategic planning.
Marketing Effectiveness Delivery
- Ensure flawless execution of analytics projects, with emphasis on actionable outcomes and marketing ROI.
- Apply rigorous QA standards and marketing-centric storytelling to all deliverables.
- Collaborate with product teams to maximize client engagement with Gain Theory Interactive and proprietary platforms.
- Embed operational excellence, ensuring client deliverables are on time, in scope, and aligned with business impact.
Commercial & Financial Growth
- Identify and lead incremental growth opportunities across existing client portfolios, focusing on measurable marketing value creation.
- Support profitability by optimizing project scope, resource allocation, and client engagement models.
- Lead and support new business development, including RFPs and strategic pitches.
Thought Leadership & Industry Foresight
- Stay ahead of evolving trends in marketing effectiveness, data privacy, media, and consumer behavior to inform client strategy.
- Advocate for best practices in unified measurement and analytics maturity.
- Contribute to award submissions, industry panels, and Gain Theory thought leadership initiatives.
Team Leadership & Culture
- Inspire, mentor, and grow a high-performing Client Success team.
- Foster a collaborative, learning-first environment that aligns with Gain Theory’s values.
- Support team engagement, well-being, and retention initiatives.
KPIs & Success Measures
- Client Satisfaction & Advocacy Scores
- Net Sales Growth & Profitability
- Measurable Marketing ROI & Value Delivered
- Number of Senior Stakeholders Engaged
- Awards and Industry Recognition
- Employee Satisfaction (Client Success Practice)
- Operational Excellence Adoption
Your Profile
- 8+ years in client leadership roles within marketing effectiveness, consulting, or analytics.
- Proven track record influencing C-suite stakeholders and driving measurable marketing results.
- Strong expertise in marketing analytics and effectiveness (MMM, attribution, testing).
- Exceptional storytelling and communication skills, particularly around data and insights.
- A commercial mindset with a passion for client growth and value creation.
- Inspirational team leader who thrives in a fast-paced, high-impact environment.
About Gain Theory
Gain Theory is a global leader in marketing effectiveness and foresight. We empower ambitious brands to accelerate growth by delivering clarity and confidence in marketing investment decisions. Our work combines high-quality data, proprietary technologies, and advanced analytics to help brands outperform their industries.
We specialize in:
- Marketing Effectiveness & Foresight: Including MMM, attribution, unified measurement, testing, and forecasting.
- Data Strategy & Activation: From harmonization to visualization and simulation.
- Consulting & Capability Building: Industry benchmarking, bespoke roadmaps, and strategic activation.
At Gain Theory, growth is central—to our clients and to our people. We live by four core values: Be Curious, Be Positive, Act with Consideration, and Make it Better. Learn more about our values: www.gaintheory.com/our-culture-people-and-value
Client Success Senior Director (12 Month FTC) employer: Gain Theory
Contact Detail:
Gain Theory Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Client Success Senior Director (12 Month FTC)
✨Tip Number 1
Network with professionals in the marketing effectiveness and analytics space. Attend industry events or webinars where you can meet potential colleagues or clients, as personal connections can often lead to job opportunities.
✨Tip Number 2
Familiarise yourself with Gain Theory's frameworks and methodologies. Understanding their approach to marketing effectiveness will not only help you in interviews but also demonstrate your genuine interest in the company and its values.
✨Tip Number 3
Prepare to discuss specific examples of how you've influenced C-suite stakeholders in previous roles. Highlight your ability to translate complex data into actionable insights, as this is crucial for the Client Success Senior Director position.
✨Tip Number 4
Showcase your leadership skills by sharing experiences where you've inspired and mentored teams. Gain Theory values a collaborative environment, so demonstrating your ability to foster team engagement will set you apart.
We think you need these skills to ace Client Success Senior Director (12 Month FTC)
Some tips for your application 🫡
Tailor Your CV: Make sure your CV highlights relevant experience in client leadership, marketing effectiveness, and analytics. Use specific examples that demonstrate your ability to influence C-suite stakeholders and drive measurable results.
Craft a Compelling Cover Letter: In your cover letter, express your passion for client success and how your background aligns with the role. Mention your expertise in advanced analytics and storytelling, and how you can contribute to Gain Theory's mission of delivering clarity in marketing investment decisions.
Showcase Leadership Skills: Emphasise your experience in leading teams and fostering a collaborative environment. Provide examples of how you've inspired and mentored others, as well as how you've contributed to team engagement and retention initiatives.
Highlight Industry Knowledge: Demonstrate your understanding of current trends in marketing effectiveness, data privacy, and consumer behaviour. Mention any thought leadership contributions you've made, such as participation in industry panels or award submissions, to showcase your commitment to staying ahead in the field.
How to prepare for a job interview at Gain Theory
✨Showcase Your Leadership Skills
As a Client Success Senior Director, you'll need to demonstrate your ability to lead and inspire teams. Prepare examples of how you've successfully managed client relationships and driven team performance in previous roles.
✨Master the Art of Storytelling
Your role will involve translating complex data into actionable insights. Practice articulating your past experiences where you effectively communicated data-driven results to stakeholders, ensuring clarity and engagement.
✨Demonstrate Commercial Acumen
Be ready to discuss how you've identified growth opportunities and optimised project scopes in your previous positions. Highlight your understanding of marketing effectiveness and how it translates into measurable business value.
✨Stay Ahead of Industry Trends
Familiarise yourself with the latest trends in marketing effectiveness, data privacy, and consumer behaviour. Be prepared to share your insights on how these trends can impact client strategies and drive success.