Title: Customer Development Manager / National Account Manager Location: Waltham on the Wolds, 1 to 2 days per month Contract: Full-time, 6 Months (35 hours per week) About the Role Randstad Sourceright are recruiting on behalf of Mars for an experienced Customer Development Manager / National Account Manager to support the management and growth of a key grocery retail customer. This role plays a critical part in delivering sales plans, managing Joint Business Planning activity, and driving performance through strong commercial and analytical capability. Key Responsibilities * Deliver against sales targets and support the execution of Joint Business Plans (JBP). * Manage and develop the relationship with a major grocery retailer. * Lead forecasting processes and contribute to financial planning and reporting. * Support invoice management and customer financial reconciliations. * Identify opportunities to grow, protect, and diversify customer business. * Analyse performance trends and present insight-led recommendations. * Ensure operational excellence and high-quality customer service delivery. Requirements * Proven experience as a Customer Development Manager or National Account Manager. * Strong understanding of the Joint Business Planning (JBP) process. * Excellent financial acumen with experience in forecasting, reporting, and invoicing. * Strong analytical skills and the ability to interpret commercial data. * Effective relationship builder with strong communication and negotiation capability. What We Offer * Opportunity to work with one of the world’s most recognised FMCG brands. * Hybrid flexibility — required onsite only 1–2 times per month. * Competitive day rate and supportive working environment. * A role that offers both autonomy and the ability to make a direct commercial impact. Apply Now If you are an experienced sales professional looking for an engaging and commercially focused role within a leading global organisation, apply today! We are committed to providing equal employment opportunities and encourage all qualified candidates to apply