Senior Econometrician - Marketing Effectiveness

Reporting to the Marketing Effectiveness Manager, Econometrics you will work with an experienced econometrics team to deliver comprehensive econometric modelling projects. Youll gather, process, and explore data using tools such as Excel, R, Python, or other data manipulation and visualisation software. Youll use your skills to analyse data to identify trends, relationships, and valuable insights that can inform econometric modelling efforts. Additionally, youll build econometric models that quantify the factors driving key business performance indicators (KPIs) and conduct bespoke analyses to answer specific business questions and requirements as needed. Youll be responsible for creating compelling presentations that translate econometric modelling insights into clear, actionable business recommendations and present your results and findings to stakeholders and provide support for further bespoke analyses as required. Youll work closely with colleagues across Group Customer & Communications and other functions to maximise the business value derived from analytics and modelling initiatives.

Qualifications

• Experience working in econometrics, either in an agency or client-side setting
• Proven ability to utilise Marketing Mix Modelling (MMM) techniques to measure and attribute the effects of various marketing activities on key business performance metrics
• Experience in gathering, cleaning and analysing data using tools such are R, Python and/or advanced Excel skills
• Strong numerical skills and meticulous attention to detail, enabling accurate and thorough data handling from input to output throughout all stages of the MMM project lifecycle
• An understanding of media buying and planning processes, and how econometrics can be used to shape media planning strategies
• Strong written and verbal communication skills to deliver information accurately and clearly
• Passion for data-driven decision-making and translating insights into actionable recommendations for marketing strategy
• The ability to present and explain complex analytical information in a straightforward manner to stakeholders without a technical background
• A collaborative mindset to work effectively with media buying, planning, and other cross‑functional teams

Our Customer First Behaviours

• Feel what customers feel – We step into our customers\’ shoes, using their feedback and insights to empathise with them and to understand their needs, so that every decision we make starts and finishes with our customers in mind
• Say it straight – We are brave in speaking out and saying what we think – we\’re honest and direct with good intent, openly sharing diverse perspectives to reach the best conclusions and using language everyone can understand
• Push for better – We don\’t settle for mediocrity, we challenge the status quo, taking responsibility for continuous improvement and personal development
• Get it done – We prioritise what will have the greatest impact, we are decisive, and we take accountability for delivering brilliant customer outcomes

You can strengthen your application by showing how our customer first behaviours resonate with you, and where you may have already demonstrated these.

Nationwide Building Society Swindon Contract Full time Nationwide is a well‑established and market leading financial services provider, and the biggest building society in the world. At Nationwide we openly put 15 million members at the centre of every decision we make as a business. Every role, no matter what its doing, is member focussed. Our Group Customer & Communications function is expanding, and we are building our in‑house econometrics capabilities. We are seeking a talented individual to join our team and deliver econometric insights and recommendations that will optimise the efficiency of Nationwides marketing plans. This is an 18‑month fixed term contract opportunity. At Nationwide we offer hybrid working wherever possible. More rewarding relationships are supported through our hybrid approach, bringing colleagues together across our UK wide estate, whilst also supporting generous access to home working. We value our time in the office to solve problems, to learn, and to feel connected., As a mutual, we\’re owned by our members – those customers who bank, save or have a mortgage with us. We challenge the financial sector status quo. We don\’t see customers as the engine of our own profit. We share our profits with them and put their needs first. Always there when they need us. Supporting them and their lives. If you\’re inspired by fairer finances, passionate about making a meaningful impact, and truly care about our customers, you\’re one of us. At Nationwide, you are challenged to grow and rewarded for doing so. Valued. Recognised. Inspired to be your best. As a community we want our working lives to count. As a team, we celebrate what we achieve. As a standard‑setter, we work for the good of customers, communities, and broader society. We are purpose‑driven. Uncompromisingly customer. Unstoppably Nationwide.

Extras You\’ll Get

• 25 days holiday, pro rata
• From January 2026, all colleagues will have access to fully funded private medical insurance
• A personal pension – if you put in 7% of your salary, we\’ll top up by a further 16%
• Access to an annual performance related bonus
• Access to training to help you develop and progress your career
• A great selection of additional benefits through our salary sacrifice scheme
• Life assurance worth 8x your salary
• Wellhub – access to a range of free and paid options for health and wellness
• Up to 2 days of paid volunteering a year