Snr Commercial Manager in London

Sizewell C’s business is to design, finance, construct, commission, operate, maintain, and eventually decommission the nuclear power plant and related infrastructure at Sizewell C in Suffolk. Overall, whilst the Company is in the construction phase, the Boards’ principal focus is on the development and construction of Sizewell C on time, on budget and to the highest quality and safety standards. The Company is maturing to meet all these requirements.

Sizewell C is economically regulated by OFGEM under the Regulated Asset Base (RAB) model similar to other UK electricity distribution networks and Thames Tideway. Sizewell C construction strategy is to replicate the design of Hinkley Point C, using the majority of the same supply chain, but innovating in the way it is delivered to achieve savings in time and cost of around 20%. The CCO will need to be guided by and incorporate lessons learned from the Hinkley Point C commercial delivery to achieve Sizewell C’s ambition.

Following Financial Completion and Revenue Commencement, Sizewell C is fully funded and is owned by; The Secretary of State for Energy Security and Net Zero representing HM Government, La Caisse, Centrica, EDF and Amber Infrastructure. Sizewell C is entering an exciting phase of growth as we mature into an independent organisation and continue building one of the UK’s largest and most important energy projects.

Contract Type: Permanent - Office-based with hybrid flexibility (typically 3 days p/w in the office)

Working Pattern: Full time

Closing Date: Friday 4th September 2026

Location: London

Salary: Circa £82,000 depending on experience

Bonus: 5% annual incentive

Pension: Up to 7.5% employee contribution / 15% employer contribution

Holiday: 28 days plus bank holidays

Benefits: Flexible benefits

About the Role

Reporting To: Commercial Lead – Civil Works, As Senior Commercial Manager you will support the effective implementation of the Programme Alliance Agreement (PAA) - a multi billion pound, multi‑party alliancing contract - across Sizewell C (SZC) processes, systems and teams. The role will focus on assisting in the identification and resolution of interface gaps between PAA contractual requirements and SZC functional processes, providing expert advice to Commercial teams and functions, developing contract management guidance, and training, and supporting the use and development of the Unifier contract administration tool.

This role suits a big‑picture thinker—someone who can evaluate options, risks and consequences to shape effective solutions. Working proactively with functions such as design, project controls (cost, programme, risk), delivery, legal, land, consents, environment and sustainability, site operations, health and safety, quality and document control, the Senior Commercial Manager brings clarity, alignment and confident decision‑making to high‑pressure, fast‑moving environments. The role ensures robust governance, identifies gaps in contracts, policies and procedures, and strengthens commercial controls across the programme.

Key Responsibilities

• PAA Contract Management: Acting as a subject matter expert on the PAA. Identifying and resolving gaps between contractual requirements and SZC processes. Providing practical commercial advice to contractor teams and functions. Supporting consistent contract administration and governance across the programme. Promoting dispute avoidance through proactive issue resolution.
• Training, Guidance and Capability: Developing training materials, guidance and templates for the use of the PAA. Producing and supporting roll-out of the Contract Management Manual. Delivering training and coaching to commercial and functional teams. Embedding consistent contract management standards across the SZC Civils programme.
• Systems and Process Improvement: Supporting the development of the Unifier contract administration platform. Ensuring commercial processes, controls and workflows are embedded effectively. Identifying opportunities to improve efficiency, transparency and data quality.
• Post-Award Contract Management: Driving supplier performance and commercial governance. Mitigating risks and resolve commercial issues. Supporting proactive dispute avoidance. Providing strategic oversight across the relevant portfolio.

What the candidate will bring

• Senior-level experience in commercial or supply chain roles on major infrastructure, energy, nuclear or complex regulated projects.
• Strong procurement and post-contract management experience.
• Good understanding of dispute avoidance and issue resolution.
• Strong knowledge of Alliance, NEC and/or FIDIC contracts.
• Experience with alliance or target cost contracts would be advantageous.
• Excellent stakeholder management, negotiation and communication skills.
• Ability to translate complex contractual requirements into practical guidance and processes.

Education and Professional qualifications:

• Bachelor’s degree in quantity surveying, civil engineering, law, construction or project management or equivalent.
• Professional qualifications such as MCIPS, MRICS, MCIArb, MAPM, MCIOB or equivalent are preferred.

At Sizewell C we encourage and embrace diversity and how it can improve our experience and performance at work. It is a requirement that those who join us have the right to work in the UK. Whilst sponsorship may be a possibility that we can explore, we are fully committed to local recruitment where possible, and those already holding the right to work in the UK.

To be appointed to this role, you will need to meet the criteria for Security Vetting, which will, ordinarily, require you to have been a resident of the UK for at least three of the past five years.