Senior Commercial Manager

Sizewell C; City Of London; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A major infrastructure project in the UK is seeking an experienced commercial professional to lead the management of large-scale engineering programmes. You will handle NEC3 and NEC4 contracts, mentor team members, and engage with senior stakeholders. The ideal candidate has significant experience in construction technology, contract administration, and is familiar with major infrastructure projects, ensuring successful project delivery. Competitive salary and hybrid working offered.

Benefits

Competitive salary

5% annual bonus

28 days holiday

Market-leading pension

Health cover

Cycle-to-work scheme

Discounts on various services

Qualifications

• Extensive experience in delivering major programmes valued between £10m and £100m+.
• Strong working knowledge of NEC3/NEC4 contracts.
• Experience in drafting position papers and commercial reports.

Responsibilities

• Lead commercial management of major programmes within heavy civils.
• Engage with senior stakeholders, providing clear advice.
• Contribute to strategic commercial planning and decision-making.

Skills

NEC contract management

Stakeholder management

Negotiation skills

Construction technology knowledge

Project evaluation

Education

Degree or equivalent experience

Professional membership (RICS, CICES, IOB, CIPS)

Job description

Responsibilities

• Lead the commercial management of major programmes within heavy civils or large‑scale engineering and infrastructure projects.
• Manage and administer NEC3 and NEC4 Engineering and Construction Contracts, ensuring compliance with contract conditions and effective delivery.
• Prepare and maintain key NEC documentation, including early warning notices, compensation events and programme submissions.
• Draft 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.
• Mentor and develop junior team members, building capability across the commercial function.
• Engage confidently with senior stakeholders and clients, providing clear advice and updates.
• 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.

We're looking for a seasoned commercial professional with extensive experience delivering major programmes, ideally within heavy civils or large‑scale engineering and infrastructure projects valued between £10m and £100m+. You will bring a deep understanding of construction technology, cost drivers and supply chain management, combined with strong working knowledge of NEC3/NEC4 contracts – particularly in contract management and administration. Your ability to draft position papers, author change events, evaluate complex quotations and produce clear commercial reports will set you apart. Proven experience in major projects and NEC3/4 or FIDIC contracts, strong commercial, negotiation and stakeholder management skills, knowledge of UK contract law and procurement best practices, degree or equivalent experience, and professional membership (RICS, CICES, IOB, CIPS) desirable.

Project Overview

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

Compensation & Benefits

Salary: Competitive salary (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

Hybrid working & ongoing professional development

Key Competencies

• Humility
  • Recognise the value brought from different cultures and experiences.
  • Be open to others’ 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 tier 1s and 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.