Snr Commercial Manager - NI

Sizewell C; Greater London; Hybrid; GBP 75,000 - 91,000; Full time

Benefits offered by this job

Health cover

Cycle-to-work scheme

Discounts & more

Hybrid work model

Job summary

Sizewell C Company is seeking a seasoned Commercial Manager/Senior Commercial Manager to lead the commercial management of programme-wide contracts within our large-scale engineering project in the UK.

You will administer FIDIC/NEC4 contracts, prepare variations and claims, forecast costs and report on commercial performance, while mentoring junior staff and collaborating with multidisciplinary teams to deliver value-driven outcomes.

Qualifications

• Experience delivering major infrastructure contracts.
• Experience with FIDIC and NEC3/4 contracts.
• Strong commercial, negotiation and stakeholder management skills.
• MRICS or CIPS preferred.
• Experience in energy/infrastructure sectors.

Responsibilities

• Lead commercial management of major contracts within large-scale projects.
• Administer FIDIC/NEC contracts ensuring compliance.
• Prepare contract documents, variations and claim responses.
• Understand price fluctuation clauses and report on cost changes.
• Draft position papers and commercial reports for project decisions.
• Mentor and develop junior team members within the commercial function.
• Engage with senior stakeholders and clients to protect contractual rights.

Skills

FIDIC contracts experience

Negotiation

Stakeholder management

Contract administration

Leadership and mentoring

Education

Degree or equivalent experience

MRICS or CIPS membership preferred

Tools

CEMAR Contract Management

Job description

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: 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.

We’re looking for a seasoned commercial professional with extensive experience delivering major programmes, ideally within large-scale engineering and infrastructure projects valued between £10m and £100m+. Experience in industries such as Energy (Nuclear, Wind, Solar, Oil and Gas), Datacentres and the like will be highly regarded. You’ll bring a deep understanding of construction technology, cost drivers, and supply chain management, combined with a strong working knowledge of FIDIC (highly desirable) and NEC3/NEC4 contracts; particularly in contract management and administration. Your ability to draft position papers, evaluate variations, evaluate complex quotations, manage risk and produce clear commercial reports will set you apart.

What You’ll Do

• Lead the commercial management of major contracts within large-scale engineering and infrastructure projects.
• Manage and Administer FIDIC 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 direct reports and early-career 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 (highly desirable) or NEC3/4 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 but not essential
• Knowledge of UK contract law and procurement best practices
• Degree or equivalent experience
• Professional membership (RICS, CICES, IOB, CIPS) desirable

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.

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