Commercial/Senior Commercial Manager - Design Contracts

Sizewell C Company; Greater London; Hybrid; GBP 90,000 - 120,000; Full time

Benefits offered by this job

Bonus: 5% annual target

Holiday: 28 days + bank holidays

Pension: Market-leading up to 7.5% / 0

Office Location: London

Hybrid working & ongoing professional

Job summary

Sizewell C is recruiting a Commercial Manager / Senior Commercial Manager to lead the commercial management of major contracts in a large-scale engineering and infrastructure programme in London. You will manage FIDIC/NEC/Bespoke contracts, administer variations and cost reporting, and maintain strong relationships with suppliers and senior stakeholders.

The role requires a strong track record in major projects, excellent negotiation skills, and the ability to mentor a multidisciplinary team

Qualifications

• Experience in major projects and FIDIC or NEC3/4/bespoke contracts.
• Strong commercial, negotiation, influencing and stakeholder management skills.
• Knowledge of UK contract law and procurement best practices.

Responsibilities

• Lead the commercial management of major contracts within large-scale engineering and infrastructure projects.
• Prepare and maintain key contract documentation, including variations and claim responses.
• Engage with senior stakeholders and clients, providing clear commercial advice.
• Mentor and develop team members across the commercial function.
• Drive value-driven outcomes while protecting the client’s contractual position.

Skills

Contract management

Negotiation

Stakeholder management

Team leadership

Education

Degree or equivalent experience

MRICS or CIPS 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'sin It for You

• Bonus: 5% annual target
• Holiday: 28 days + bank holidays
• Pension: Market-leading (up to 7.5% employee / 15% employer)
• 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.

WhatYou'llDo

• 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.

WhatYou'llBring

• 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

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.
• 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.
• Drive simplification at all levels.