Environmental & Sustainability Manager in Leiston

At Amentum, we are driven by an unyielding commitment to innovation, integrity, and collaboration, tackling significant challenges in science, security, and sustainability. If you are 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. We believe that success comes from continuously pushing boundaries and working together to deliver on our promises.

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 would 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. We are happy to discuss hybrid, part-time, and flexible working hours, patterns, and locations to suit you and our business.

About the opportunity:

Provide leadership in environmental and sustainability performance for Sizewell C (SZC), ensuring full compliance with environmental permits, licences, and commitments across a nationally significant nuclear construction project. Lead the site-based Environment & Sustainability team and act as the main interface with regulators, contractors, and SZC project leaders. The role supports compliance through construction, installation, commissioning, and handover to operations. The E&S Manager sits in the Site Construction Delivery Team, reporting to the Head of Site Compliance. The project operates under strict environmental frameworks (DCO, permits, licences) and is subject to high public and regulatory scrutiny. The role oversees a multidisciplinary E&S team (10 people), influences Tier 1 contractors, and manages environmental monitoring budgets.

Key Responsibilities:

• Provide clear leadership to E&S teams and Tier 1 contractors.
• Ensure full compliance with environmental permits, licences, consents, and ISO 14001.
• Oversee site inspections, surveillance, and performance monitoring.
• Ensure significant environmental aspects are identified, managed, and mitigated.
• Drive environmental and sustainability performance across SZC and supply chain.
• Promote world-class environmental behaviours and best practice.
• Lead environmental investigations and implement performance improvements.
• Act as primary interface with environmental regulators (e.g., Environment Agency).
• Build strong working relationships with internal teams, contractors, and public bodies.
• Provide a professional service on all environmental and regulatory matters.
• Develop and implement KPIs and reporting to drive continuous improvement.
• Ensure department processes, resourcing, and quality standards meet SZC requirements.
• Support delivery teams across pre-construction, construction, and commissioning phases.
• Embed lessons learned and support the One Team culture with Tier 1 contractors.

Here’s What You’ll Need:

• Extensive experience leading E&S teams on major, highly regulated construction projects.
• Strong understanding of environmental permits, licences, and compliance arrangements.
• Broad construction knowledge (civils → mechanical → electrical → commissioning).
• Strong leadership, influencing, communication, and stakeholder management skills.
• Ability to work across technical disciplines and operate effectively from site to boardroom.
• High standards of organisation, detail, assurance, and professional judgement.
• Understanding of sustainability opportunities and constraints on major projects.
• Degree in Environmental discipline.
• Strong leadership experience.
• Extensive client & principal contractor experience managing environmental issues on large infrastructure or engineering projects.
• Experience working with regulators and managing regulatory commitments.
• Experience implementing management systems and environmental controls.

Desirable:

• Experience in highly regulated industries.
• Experience driving sustainability initiatives.

Our Culture:

Our values stand on a foundation of safety, integrity, inclusion, and diversity. We put people at the heart of our business, and we genuinely believe that we all succeed by supporting one another through our culture of caring. We value positive mental health and a sense of belonging for all employees. We aim to embed inclusion in everything we do. We know that if we are inclusive, we are more connected, and we are more creative. We accept people for who they are, regardless of age, disability, gender identity, gender expression, marital status, mental health, race, faith or belief, sexual orientation, socioeconomic background, and whether you are pregnant or on family leave. This is reflected in our wide range of Global Employee Networks. We partner with VERCIDA to help us attract and retain diverse talent. As a Disability Confident employer, we will interview all disabled applicants who meet the minimum criteria for a vacancy. We welcome applications from candidates who are seeking flexible working and from those who may not meet all the listed requirements for a role.