Transformation Manager - Deltek Costpoint in London

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.

About the Opportunity: Amentum is a global leader in advanced engineering and innovative technology solutions, trusted by government and commercial customers to address their most significant and complex challenges in science, security and sustainability. Our people apply undaunted curiosity, relentless ambition and boundless imagination to challenge convention and drive progress. Our commitments are underpinned by the belief that safety, collaboration and well-being are integral to success. Headquartered in Chantilly, Virginia, we have more than 53,000 employees in approximately 80 countries across all 7 continents.

Following a recent transition from Oracle E-Business Suite R12 to Deltek Costpoint, we are currently seeking a dynamic and experienced Transformation Manager for Deltek Costpoint. In this role you'll have the strategic objective of the end-to-end delivery of Costpoint recovery, integration and the automation roadmap. The successful candidate will play a key role working within complex ERP environments, with the ability to operate across global teams, and the confidence to lead stabilisation and improvement initiatives.

• Financial outputs, including trial balance integrity and balance sheet reconciliations.
• Ensuring consistent and reliable revenue recognition across a complex project portfolio.
• Improving efficiencies to enable timely and accurate cash collection.
• Time booking, cost allocation, and project cost controls.
• Procure-to-pay processes, developing efficiencies.

• Complex global project delivery environment with approximately 1,600 live projects.
• Sectors include engineering, nuclear, defence, and infrastructure.
• Multi-entity UK statutory reporting environment.
• Project delivery across the UK, Europe, and wider international markets.

• Collaboration with US-based corporate Costpoint and IT teams.
• Engagement with a Poland-based Global Delivery Organisation (GDO).
• Close working relationships with UK-based finance and integration teams.
• Coordination with external Deltek Costpoint and system integration specialists.

The role will report into the VP of Finance and will support hybrid working with both UK and international travel.

• Deep, hands-on experience with Deltek Costpoint with proven experience in implementing or recovering Costpoint.
• Configuring finance, projects, billing, and revenue modules.
• Comfortable operating at both a system configuration level and strategic programme level.
• Proven track record leading complex, multi-stakeholder transformation programmes for Global delivery teams (UK, US, offshore).
• Experience in managing internal teams, external partners and corporate stakeholders.
• Experienced integrating ERP systems with HR systems (e.g. Workday), Workflow/AP systems (e.g. OnBase) and Project controls/reporting tools (e.g. OnPoint, P6).
• Knowledge of automation (RPA / workflow) and AI use cases in finance/project environments.
• Delivery focus and accountability mindset.
• Able to operate in complex environments with a pragmatic, decisive, and outcome-oriented approach.
• Credible with senior leadership and technical teams.

Our values are built on a strong foundation of safety, integrity, and respect for every individual. People are at the heart of our mission, and we believe in supporting one another through a culture of care and collaboration. We strive to create a workplace where everyone feels they belong and can thrive. Supporting mental wellbeing and fostering a sense of connection are essential to how we work. When we embrace different perspectives and work together, we become more innovative, more agile, and more successful.

We partner with VERCIDA, for greater online accessibility. 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, please contact the team.