Our client, a leading name in the procurement supply chain sector, is seeking a Senior Buyer to join their team based in either Harefield or Ipswich. This permanent position sits within their Energy Supply Chain team, supporting major substation and energy infrastructure projects. You will play a vital role in the procurement of critical, high-value, long-lead materials, working closely with operational teams, suppliers, and stakeholders to ensure projects are delivered safely, on time, and to best value. This is a highly collaborative role with the opportunity to shape procurement strategy within a growing and forward-thinking business.Key Responsibilities:Supporting Energy Major Projects with the procurement of critical materials and servicesEngaging early with estimating and work-winning teams to support pricing and procurement strategyDeveloping and delivering procurement strategies aligned to project and wider group objectivesManaging supplier relationships, including negotiation, performance monitoring, and KPI managementIdentifying and working with key strategic suppliers and subcontractors, both UK and internationalEnsuring compliance with client frameworks, technical specifications, and regulatory requirementsMonitoring cost performance against tender allowances and project programmesProviding technical procurement support to contract teams, including specifications, COSHH and HandS documentationSupporting category management activities and wider group procurement in