Senior Technical Manager

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

About the Role

Amentum is seeking an experienced Senior Technical Manager to provide technical leadership across major water and wastewater infrastructure programmes. The role is responsible for leading multidisciplinary engineering teams, ensuring technical excellence, governance and innovation throughout the project lifecycle, from feasibility and design through construction, commissioning and handover.

Must have significant experience working with UK water utilities and major capital delivery programmes.

Key Responsibilities

• Lead and coordinate multidisciplinary engineering teams across water infrastructure projects.
• Establish technical strategies, engineering delivery plans and governance arrangements.
• Provide technical oversight and assurance to ensure compliance with client requirements, legislation and industry standards.
• Manage complex technical risks, interfaces and engineering challenges.
• Support project and programme delivery by aligning engineering activities with cost, schedule and construction requirements.
• Lead design reviews, technical assurance activities, value engineering and constructability assessments.
• Build strong relationships with clients, delivery partners, contractors and key stakeholders.
• Champion innovation, sustainability, digital engineering and low-carbon solutions.
• Mentor and develop engineering teams, promoting technical excellence and professional growth.
• Support bids, proposals and business development opportunities across the water sector.

Essential Requirements

• Degree-qualified in an engineering or related technical discipline.
• Significant experience in technical leadership within the water, wastewater or major infrastructure sectors.
• Proven track record leading multidisciplinary engineering teams on complex projects or programmes.
• Strong understanding of engineering governance, design management and risk management.
• Experience across the full project lifecycle, from feasibility through to commissioning and handover.
• Excellent leadership, communication and stakeholder management skills.

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’re more connected, and we’re 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’re 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. For greater online accessibility, please visit to view and access our roles. 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.

If you require further support or reasonable adjustments with regards to the recruitment process (for example, you require the application form in a different format), please contact the team.

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