Assistant Commercial Manager - Fix Term Contract (Sizewell C)

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Assistant Commercial Manager - Fix term Contract
Sizewell C
 

Location: London, Suffolk,
Contract: Permanent, full-time. 
Closing Date: Thursday 14th May 2026  

What’s in It for You:

Salary: Circa £47,000 (depending on experience)
Bonus: 5% annual incentive 
Pension: Up to 7.5% employee / 15% employer contribution 
Leave: 28 days holiday plus bank holidays 
Hybrid Working: Typically, 2–3 days in the office per week, with flexibility based on business needs 
 

Your Impact

 
As Assistant Commercial Manager, you will play a key role within the SZC Supply Chain team, with accountability to the Supply Chain Manager for the effective commercial administration of multiple SZC contracts across the Project’s central functions. The role is empowered to make decisions within clearly defined delegated levels of authority, operating under the overall guidance of the Supply Chain Manager.

You will act as the primary commercial point of contact for the contracts assigned to you, working proactively and collaboratively with stakeholders at all levels and across all SZC Project teams. The post‑holder will ensure that contractual obligations are managed effectively and that contract delivery supports both the individual contract requirements and the wider objectives of the SZC Project.
 

Accountabilities

Providing support to the procurement process and Supply Chain Manager/Supply Chain during the contract creation phase (pre-award); including assessing the scope, duration and expected value of each of the Contracts against the budget and defining the commercial requirements of a contract.

The Assistant Commercial Manager is responsible for ITT preparation, evaluation and negotiation, ensuring that selected tenders are compliant with the scope and commercial requirements, including:

 
• Provide stakeholder management across the Project.
• Managing Supplier / Contractor commercial relationships and engagement
• Implementing progress and dashboard reporting
• Maintaining procurement and contract commercial files and records
• Interfacing with Legal team on conditions of contract issues and non-disclosure agreements
• Development of ITT/RFQ packages including technical, commercial, legal documentation
• Ensure lessons learnt from EDF and HPC are captured and implemented in SZC procurement strategy
• The Assistant Commercial Manager will provide support to the Supply Chain Manager in ensuring all internal governance approval is in place to enable timely Contract Award.
• Participating in the contract kick-off meeting and organising the Supply Chain section of the meeting.
• Commercially Administering the contract including Notices and Instructions; Applications, Invoicing and Payment; Variations and Changes; Disputes and Claims; Progress Monitoring and Financial Reviews; Liabilities; Confidentiality Agreements; etc.
• Leading contract commercial reviews and attending progress reviews where necessary.
• Participating in contractor performance management.
• Ensuring contractual deliverables are met.
 

Knowledge, Skills, Qualifications & Experience
 

• Proven experience in a procurement role with demonstrable responsibility and experience
• The post holder will be a member of the Chartered Institute of Purchasing and Supply (CIPS) or a student member working towards the professional qualification
• Demonstrated stakeholder management skills with experience in working with and advising Senior Management
• Experience of developing supply chain procurement strategies for Projects
• Strong understanding of contract and commercial law and sound understanding of contractual terms and conditions
• Experience in Bid Process Management including supplier sourcing, documentation, evaluation and selection and managing the tendering and award of contracts for high value multidiscipline contracts.
• Experience in negotiating high value contracts, and drive complex commercial negotiations to conclusion
• Proven experience working with cross functional teams
 

Behavioural Competences
 

Humility

Recognise the value brought from different cultures and experiences.
Be open to other’s points of view and ideas, be willing to debate and to compromise.
 

Positivity

Positively challenge poor quality and performance.
Identify solutions at the lowest possible level.
Encourage others to bring new ideas forward.
 

Respect

Value the rules and environment in which we operate.
Give and receive feedback with respect.
Embrace and engage with new people and ideas.
 

Solidarity

One team, working closely together and helping each other.
Empowered teams always looking forward.
Shared responsibility for delivery the project outcomes.
 

Clarity

Communicate clearly and consistently.
Promote collaboration and team alignment.
Clearer and faster decision making.
Drive simplification at all levels.
 

If this sounds like the next step in your career, we’d love to hear from you. Apply today. 

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.