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Commercial / Senior Commercial Manager - Design Contracts 
Sizewell C

Why Join Us? 

Sizewell C is one of the UK’s most ambitious infrastructure projects—a next-of-a-kind nuclear power station that will deliver clean, reliable energy for generations. Following our Final Investment Decision, construction is fully underway. This is your chance to lead at scale and play a pivotal role in Britain’s journey to energy security and Net Zero. 

What’s in It for You 

Salary: 66,000 - 83,000 Circa (depending on experience) 
Bonus: 5% annual target 
Holiday: 28 days + bank holidays 
Pension: Market-leading (up to 7.5% employee / 15% employer) 
Benefits: Health cover, cycle-to-work scheme, discounts & more 
Office Location: London
Hybrid working & ongoing professional development.

A Commercial Manager / Senior Commercial Manager within the Technical Contract Team is responsible for leading the commercial management of programme-aligned scopes of work, ensuring effective contract administration, governance, and supplier performance throughout the contract lifecycle. Embedded within a multidisciplinary delivery team (MDT), the role works closely with Project Management, Technical & Engineering, and Project Controls functions to support safe, timely and cost-effective delivery of the Sizewell C design.

Key responsibilities include managing contractual communications, payment and cost assurance, forecasting and reporting, administering variations and compensation events, supporting risk and claim mitigation, and maintaining constructive commercial relationships with the supplier. 

The role is expected to proactively identify and resolve commercial issues, provide robust commercial advice to delivery teams, and secure fair, value-driven outcomes that protect SZC's commercial position while supporting collaborative contract delivery. For Senior Commercial Managers, additional expectations include leading complex negotiations, managing significant commercial risk and change, influencing senior stakeholders, and providing leadership and mentoring across the wider Technical commercial team. A civil engineering background, MRICS or CIPS is preferred. If successful, you will be part of a very friendly and supportive team.

What You’ll Do 

Lead the commercial management of major contracts within large-scale engineering and infrastructure projects. 
Manage and Administer FIDIC/NEC/Bespoke Contracts, ensuring compliance with contract conditions and effective delivery. 
Prepare and maintain key contract documentation, including early warning notices, variations and claim responses. 
Understand and administer price fluctuation clauses.
Be articulate in drafting position papers, prepare commercial reports and author change events to support project decisions. 
Apply your understanding of construction technology, cost drivers and supply chain management to optimise outcomes. 
Manage, mentor and develop team members building capability across the commercial function. 
Engage confidently with senior stakeholders and clients, providing clear advice and updates.
Engage with team members and contractors in a confident, professional, and collaborative manner, fostering constructive relationships while assertively ensuring that the client’s contractual rights and obligations are always protected. Take ownership of challenges and deliver solutions from start to finish without the need for direction. 
Contribute to strategic commercial planning and decision-making to support project success. 
Manage and contribute to ongoing continuous improvement initiatives.

What You’ll Bring 

Proven experience in major projects and FIDIC or NEC3/4/Bespoke contracts 
Strong commercial, negotiation, influencing, problem solving, communication and stakeholder management skills
Team-oriented mindset, and fosters innovation and collaboration
Ability to absorb complex information and assess requirements and make recommendations
Experience of CEMAR Contract Management platform desired 
Knowledge of UK contract law and procurement best practices 
Degree or equivalent experience 
Professional membership (RICS, CICES, IOB, CIPS) desirable 

Apply Now 

For this role you must have evidence of right to work in the UK. As a project, we do not discriminate on the grounds of age, gender, race, colour, religion, disability or sexual orientation, and we welcome applications from all sections of the community.