Senior Marketing Effectiveness Manager in City of Westminster

Being a part of M&S is exactly that – playing your part to bring the magic of M&S to our customers every day. We’re an inclusive, dynamic, exciting, and ever-evolving business built on doing the right thing and bringing exceptional quality, value, and service to every customer, whenever, wherever, and however they want to shop with us.

Here are some of the benefits we offer that make working for M&S just that little bit more special:

• After completing your probationary period, you’ll receive 20% colleague discount across all M&S products and many of our third-party brands for you and a member of your household.
• Competitive holiday entitlement with the potential to buy extra holiday days!
• Discretionary bonus schemes awarded based on how you achieve your personal objectives and our performance as a business.
• A generous Defined Contribution Pension Scheme and Life Assurance.
• A dedicated welcome to our teams with a tailored induction and a wide range of training programmes to develop your skills.
• Amazing perks and discounts via our M&S Choices portal to maximise your financial and personal wellbeing.
• Industry-leading parental, adoption, and neonatal policies, providing support and flexibility for your family.
• Access to a fantastic range of wellbeing support for all colleagues including access to our 24/7 Virtual GP and PAM Assist to support you and your family.
• A charity volunteer day to support a charity or cause you're passionate about through a dedicated day away from work.

What you’ll do:

• Lead marketing effectiveness for M&S Fashion, Home & Beauty by ensuring every digital investment delivers measurable growth.
• Own the measurement frameworks, tools, and insights that drive smarter decisions, optimise ROI, and shape future strategy.
• Act as the link between Marketing, Data, and Technology—turning complex data into clear actions that influence leadership and accelerate digital performance.
• Own our approach to econometrics and Marketing Mix Modeling (MMM), translating insights into actionable strategies that drive growth.
• Design and improve tools and dashboards to monitor marketing effectiveness, ensuring KPIs clearly link media inputs to business outcomes.
• Turn complex data into compelling narratives that influence senior leadership and shape investment decisions.
• Drive a culture of experimentation across channels to improve efficiency and effectiveness.
• Act as the bridge between Marketing and Digital Technology—embedding new tools, enabling AI and automation, and ensuring seamless integration of our tech stack.
• Manage platform tagging and integrations for digital marketing platforms, ensuring accurate tracking and robust measurement.
• Oversee partnerships, governance, and compliance to maintain high standards across platforms.
• Work cross-functionally with Marketing, Data Science, Technology, and agency partners to deliver innovation and measurable impact.

Who you’re welcome:

• Deep expertise in digital marketing performance, econometrics, and attribution models.
• Strong commercial acumen with experience forecasting investment needs and optimising spend.
• Proven ability to design and lead test-and-learn programmes.
• Technical fluency in marketing technology platforms, DSPs, tagging/tracking frameworks, and integrations.
• Exceptional collaboration skills with the ability to influence senior stakeholders.
• Comfortable driving change and innovation in fast-evolving digital environments.

We are ambitious about the future of retail. We’re disrupting, innovating, and leading the industry into a more conscientious, inspiring digital era. We’re transforming how we work together and offering our most exciting opportunities yet. Marks & Spencer strives to be an inclusive organisation, trusted, and admired by our colleagues, customers, and suppliers. Join us and make change happen.

We are committed to building diverse and representative teams, where everyone can bring their whole selves to work and be at their best. We support each other and work together to win together.

If you feel you’d benefit from any support or reasonable adjustments during any stage of the recruitment process, please don’t hesitate to let us know when completing your application. This information will be picked up by our team, so we can try and put steps in place to help you be at your best through this process.