We are seeking a Cost Manager to join a major programme within Amentum’s Defence and Asset Solutions Division. This role will be the Subject Matter Expert (SME) for all cost-related disciplines within our Delivery Partnership PMO. Embedded within a collaborative partnership between our organisation and the client, you’ll define, implement and assure the programme’s cost management processes—ensuring transparent, accurate and timely financial control across our projects.

Key Responsibilities

• Define and communicate P3 controls processes and procedures relating to Cost Management including templates aligned to industry best practice

• Support the deployment of Project and Programme Cost reporting for Senior Leadership and the Client

• Develop relationships with internal stakeholders and client teams.

• Work with the PC Director and the leads for Planning, Risk and Change to provide an integrated project controls approach

• Review monthly forecasts to understand variances

• Work with the project teams to deliver Earned Value metrics

• Work with the Client to support their Cost Forecasting requirements.

• Act as the go-to SME on cost estimation and variance analysis, working with the project team to implement best and emerging practises

• Conduct cost assurance reviews and recommend corrective actions.

• Provide coaching, mentoring and knowledge sharing to the team and cost resources within the programme.

About You

Skills & Experience

• Significant experience in cost forecasting, budgeting, and control.

• Proficiency with Excel and Cost Management Tools (Costpoint, SAP, PRISM).

• Understanding of how Primavera P6, Power BI, Power Automate can support cost management

• Exceptional data-analysis, financial modelling and variance-analysis abilities

• Strong stakeholder management, able to influence Senior Leaders and Client peers.

• Demonstrable experience running cost assurance reviews.

• Excellent communication, collaboration and problem-solving abilities.

Preferred Education

• Degree in Engineering, Programme Management, Business or a related field.

• Experience in cost management roles on complex programmes.

• Certifications encouraged: CCC, CCE, MSP Practitioner, PSP, EVP, PMP, CAPM.

• Continuous professional development in digital cost-management tools and techniques.

Why Join Us?

This is a unique opportunity to influence how a nationally significant programme is delivered—shaping not just how we operate today, but how we evolve to meet the future. You will join a collaborative and high-performing leadership team with a strong culture of integrity, innovation and purpose.

We are committed to creating a diverse and inclusive working environment and welcome applications from all backgrounds.

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 Labor Laws Posters.