Senior Buyer

At Amentum, we're not just solving problems; we're engineering the future. Our team is driven by an unyielding commitment to innovation, integrity, and collaboration, tackling some of the most significant challenges in science, security, and sustainability. If you're passionate about making a real impact and want to be part of a community that values ethical excellence, this is the place where your ambition can thrive.

Here, we believe that success comes from continuously pushing boundaries and working together to deliver on our promises. We embrace challenges with confidence and are dedicated to creating a secure and vibrant future for all.

We’ll inspire and empower you to deliver your best work so you can evolve, grow and succeed – today and into tomorrow. We offer an exciting range of opportunities to develop your career within a supportive and diverse team who always strive to do the right thing for our people, clients and communities.

People are our greatest asset, and we offer a competitive package to retain and attract the best talent.

In addition to the benefits you’d expect, UK employees also receive free single medical cover and digital GP service, family-friendly benefits such as enhanced parental leave pay and free membership of employee assistance and parental programmes, plus reimbursement towards relevant professional development and memberships. Work-life balance and flexibility is a key focus area for us.

Amentum delivers innovative and sustainable solutions for complex environmental challenges and energy needs. We excel in areas such as environmental remediation, restoration, and compliance, ensuring the safe management of hazardous materials and contaminated sites.

We are committed to advancing energy initiatives providing expertise in renewable energy development, energy efficiency, and resilience projects. By leveraging advanced technologies and a deep understanding of regulatory frameworks, Amentum helps clients achieve environmental stewardship and energy sustainability, contributing to a safer, cleaner future while supporting mission‑critical operations.

Within the defence sector, Amentum has an essential role in the UK’s continuous at‑sea deterrent. We’re also active in naval infrastructure and shipbuilding, and in procurement and operational delivery across the whole of the UK Ministry of Defence.

We are currently seeking a Senior Buyer to join our team in Theale or Bristol (Hybrid working with an expectation of at least one day a week in the office or on‑site).

• Manage end-to-end procurement activities from requisition through to contract award and purchase order placement
• Lead tendering exercises, including pre‑qualification, tender evaluation, negotiation, and recommendation for award including the rationale behind recommendation.
• Development of bid lists and assembling of Requests for Quotations (RFQ's) and Managing the RFQ process in line with procurement procedures
• Develop and implement procurement strategies for assigned work packages and categories.
• Evaluating bidder responses to the RFQ documents
• Making shortlist recommendations to the Supply Chain Manager and operational teams highlighting distinguishing factors and risks between the different suppliers and the rationale behind recommendations
• Negotiate commercial terms, pricing, delivery schedules and service levels with suppliers and subcontractors Conducting final negotiations with the preferred supplier(s) and preparing (sub) contracts / purchase orders in compliance with the governance procedures.
• Monitoring supplier performance, delivery, quality, and cost against contractual commitment.
• Manage claims/change orders and assist with the resolution of supply issues.
• Build and maintain effective relationships with suppliers, subcontractors, and internal stakeholders.
• Provide procurement advice and guidance to project teams.
• Reviewing invoices for accuracy.
• Liaising with the operational team to assist with the resolution of supply issues
• Where appropriate, establish long term supplier relationships focusing on value for money, service & product quality and continuous improvement to…