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.
Vacancy Overview
Join the Sizewell C (SZC) project—one of the UK’s largest and most exciting megaprojects—and play a pivotal role in supporting the UK’s Net Zero ambitions. Following the success of Hinkley Point C, SZC has secured planning approval and government financing support and is now in construction and seeking private investment. Once completed, SZC will provide low carbon electricity to six million homes for 60 years.
As a Baseline & Change Manager, you will be at the heart of SZC’s Project Controls function, ensuring disciplined management of baselines and robust, consistent application of change control across the Delivery Programme. Working within the Programme Management Office (PMO), you will help ensure the project is delivered safely, on time, on budget, and to the required quality.
About the opportunity:
The Baseline & Change Management discipline ensures the project’s scope, budget, forecasts, and schedule remain aligned with approved changes governed through the Investment Change Committee (ICC) model. As Baseline & Change Manager, you will support and advise on processes and procedures that underpin change control, working closely with Project Controls Managers, Change Engineers, and Delivery Teams.
You will help facilitate the change process, support preparation for ICC meetings, and maintain high-quality reporting and governance throughout the programme lifecycle.
We have two 'Baseline & Change Manager' positions available (multiple locations) - Suffolk based & London Based (with hybrid working available).
Principal Accountabilities
Support the Baseline & Change Lead in ensuring effective use of the change management process.
Coordinate and facilitate change management activities across the Delivery Programme.
Serve as a central point of contact for all change management queries.
Assist in developing and maintaining effective baseline management strategies, plans, and procedures.
Coordinate key inputs (Schedule, Cost, Risk, PMO) to enable end to end changes to baselines, contracts, and programme governance.
Ensure governance processes are followed in line with the project reporting cycle.
Support the production of monthly Baseline & Change reports.
Manage weekly and monthly routines, ensuring data accuracy and consistency.
Promote consistent application of project controls across SZC.
Advise Project Managers, Change Owners, and Supply Chain partners on change control procedures and standards.
Collaborate with Project Controls Managers and Change Managers to ensure changes are fully identified, assessed, and implemented.
Facilitate change requests for engineering and delivery teams.
Review and monitor the quality of change proposals for completeness and alignment with the baseline.
Provide guidance and training to stakeholders on change management processes and tools.
Develop and deliver training materials to improve understanding and compliance across the programme.
Here's What You'll Need:
Degree-level education or equivalent professional experience.
Professional experience in programme, project, controls, or commercial management.
Understanding of WBS/CBS structures and change control principles.
Knowledge of governance, strategic planning, risk analysis, and major project delivery.
Strong facilitation skills and ability to work independently or collaboratively.
Ability to operate within a complex corporate environment.
Desirable
Relevant professional certifications or memberships (e.g., APM, PMI, ICE, RICS, etc.).
Experience shaping strategic changes on large programmes.
Experience managing contractors/consultants in major construction or regulated environments.
Membership or fellowship of a relevant professional institution.
Working knowledge of project controls processes and tools.
Familiarity with project/programme management software.
Understanding of contract management (including EWNs and workflow processes).
Experience maintaining project documentation and reports.
Ability to chair project meetings and workshops.
Knowledge of Power BI or similar reporting tools.
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 www.vercida.com 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 matt.jones1@global.amentum
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.