Project Manager

Amentum is a global leader in engineering, project and programme management and solutions integration. Founded on programme, project, and engineering experience, combined with deep-seated specialist capabilities, Amentum has become a recognised delivery partner across major UK Government and commercial programmes.

Our Defence & Security business supports the UK Ministry of Defence in the delivery of their capability and objectives via a host of frameworks, not least the Project Delivery Partner framework that sees us delivering Project Management, Project Controls and Operational Delivery support across the land, sea, air, and corporate domains. The work we do is of international importance in ensuring our National Security and that of our allies, something our team are proud to support. The framework enables our employees to traverse a host of innovative programmes and projects which challenges them and ensures they develop their skills to the highest levels. The support structures we have in place ensures our employee welfare and career development is achieved to the highest levels.

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. We also give back to our communities through our programmes which incorporate matched-funding, paid volunteering time and charitable donations.

About the Opportunity

We are looking for Project Managers with proven experience in infrastructure and major construction projects to join our expanding team. In this role, you will play a pivotal part in supporting our clients to successfully deliver highly complex programmes across the built environment. The position is primarily based in Portsmouth, with a requirement to be on-site for 3 days per week, with the remainder of the week offering hybrid or remote working flexibility.

Key Responsibilities include

• Understand, and deliver in accordance with, organisational policies, processes, and procedures.
• Support the development and assurance of business cases as part of wider approval processes.
• Translate customer requirements into a defined project scope and manage this scope through effective change control.
• Analyse, develop, support, and manage the timely and cost-effective delivery of client projects meeting business and environmental objectives.
• Influence, support, and expedite client project delivery through effective planning, monitoring, controlling, and reporting of project performance.
• Identify and effectively manage project assumptions and dependencies.
• Support identification of slippage / risk and remedial or mitigating actions whilst ensuring compliance with all relevant safety, environmental and management procedures.
• Champion the application of appropriate programme and project delivery strategies and commercial vehicles, which will secure a successful business outcome.
• Ensure appropriate services to the project are co-ordinated and delivered through technical, engineering, project controls, commercial and financial support functions.
• Promote and foster positive working relationships through effective stakeholder engagement planning and execution with internal and external stakeholders.
• Maintain project records, information, and history accurately and in line with policy.
• Ensure learning from experience and apply continuous improvement techniques to project delivery.

Here’s What You’ll Need

• Significant track record of successful delivering projects in line with time, cost, and quality constraints.
• Able to operate autonomously, with authority, and skilled in developing and maintaining key relationships.
• Consultancy focus with a proven history in identification and delivery of client requirements, and ability to scope wider business opportunities.
• Expertise in P3M practices, methodologies, and techniques and their appropriate application to any given environment.
• Highly skilled in the provision of coaching and mentoring.
• Educated to Degree level or equivalent in a relevant subject.
• APM PMQ qualification.
• A strong knowledge of the Defence industry and working in a high-profile Tier 1, Prime and / or subcontractor organisation is desirable.
• Member of the Association for Project Management (MAPM) would be advantageous.
• Ideally a PRINCE2 or AGILE Practitioner qualification.
• Managing Successful Programmes (MSP) Practitioner is desirable but not essential.

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 and diversity in everything we do. We know that if we are inclusive, we are more connected, and if we are diverse, 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 centred on inclusion and diversity.

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.

Your application experience is important to us and we’re keen to adapt to make every interaction even better. We welcome feedback on our recruitment process and if you need more from us before deciding to join us then please, contact

Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at.