Baseline & Change Manager

Join the Sizewell C (SZC) project-one of the UK's largest and most exciting mega projects-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.

• 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.

• 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.

• 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.

£47,166 per year - estimated

Part time NEW 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.