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Leiston, England, United Kingdom · Hybrid
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Leiston, England, United Kingdom · On-site
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Leiston, England, United Kingdom · On-site
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Leiston, England, United Kingdom · On-site
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Leiston, England, United Kingdom · On-site
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Leiston, England, United Kingdom · On-site
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Leiston, England, United Kingdom · On-site
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Leiston, England, United Kingdom · Hybrid
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Leiston, England, United Kingdom · Hybrid
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Leiston, England, United Kingdom · On-site
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Leiston, England, United Kingdom · On-site
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Leiston, England, United Kingdom · Hybrid
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Leiston, England, United Kingdom · On-site
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Leiston, England, United Kingdom · On-site
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Leiston, England, United Kingdom · On-site
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The Commercial Manager will oversee the commercial administration of allocated contracts and work packages for major infrastructure projects. This includes ensuring compliance with NEC3/NEC4 contracts, managing commercial documentation, and mitigating project risks.
Candidates must have proven experience in commercial management within major construction, engineering, or heavy civils projects. A strong working knowledge of NEC3/NEC4 contracts and relevant professional qualifications or equivalent industry experience are required.
The Sizewell C Jobs Service supports local people into exciting, long-term careers across our Project.#SZCJobs
Commercial Manager
Sizewell C
Contract Type: Permanent - Office-based with hybrid flexibility (typically 3 days p/w in the office)
Working Pattern: Full time
Closing Date: Sunday 16th August 2026
Location: London
Salary: Circa £66,000 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
Impact:
We're looking for an experienced commercial professional with a strong track record in major infrastructure, engineering, or construction projects. Ideally, you'll have experience within heavy civils and knowledge of NEC3/NEC4 contracts. You'll be confident managing commercial activities across allocated contracts or work packages, supporting project teams, assessing change, managing risk, and helping to deliver successful commercial outcomes.
Manage the commercial administration of allocated contracts and work packages within major infrastructure projects.
Administer NEC3 and NEC4 contracts, ensuring compliance with contractual obligations and project procedures.
Prepare and manage commercial documentation, including early warning notices, compensation events, payment assessments, and programme submissions.
Review and evaluate quotations, subcontractor submissions, and change proposals.
Support the preparation of position papers, commercial reports, forecasts, and cost analysis.
Work collaboratively with project, engineering, procurement, and supply chain teams to ensure effective commercial delivery.
Identify, manage, and mitigate commercial risks and opportunities.
Build strong relationships with internal and external stakeholders, providing clear commercial advice and support.
Contribute to cost control, change management, and commercial governance processes.
Support senior commercial leadership in achieving project and business objectives.
What You'll Bring
Proven experience working within commercial management on major construction, infrastructure, engineering, or heavy civils projects.
Good working knowledge of NEC3 and/or NEC4 contracts.
Strong commercial awareness, contract management, and negotiation skills.
Experience preparing and administering compensation events, early warnings, and payment applications.
Ability to analyse commercial data and provide clear recommendations.
Strong stakeholder management and communication skills.
Knowledge of UK contract law and procurement practices.
Degree-qualified or equivalent industry experience.
Professional membership (RICS, ICES, CIOB, CIPS) desirable or working towards chartership
Why Join Us
A major infrastructure project with national impact
Hybrid working with flexibility built in
Competitive salary, bonus and benefits
Clear progression and development opportunities
Supportive, collaborative team environment
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 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. 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.
Powering Innovation.
Lithion Power Group Ltd. (formerly HPC Energy Services Ltd.) has expanded! While our name is new, our team of professionals and their dedication to provide mission-critical power solutions hasn’t wavered. We’ve renewed our commitment to be a leading provider of power solutions that meet the demands of our ever-changing world. Founded in 1998 and based in Calgary, Alberta, Lithion has grown to become an integrated manufacturer of comprehensive power and energy solutions for a wide range of applications. From design, R&D through to in-house manufacturing, we’ve specialized in providing superior performing battery solutions that meet the most demanding environments, including high vibration/shock and extreme temperature. Whatever your power requirements, Lithion offers power innovation to most effectively meet your businesses requirements. To learn more, email us anytime at: [email protected].
Offices: 333 7th Avenue SW, Suite 970, Calgary, AB T2P 2Z2, CA
There are currently 97 open engineering positions in Leiston, United Kingdom listed on Clera. New openings are added daily as companies post roles.
Companies currently hiring include Lithion Power Group Ltd., Mace, Soil Engineering Geoservices Limited, Amentum, Assystem, among others. Browse the listings above to see every active employer.
Yes — 28 of the 97 open engineering positions offer remote or hybrid work (0 remote, 28 hybrid).
Each listing links directly to the employer's application page. Apply early — fresh listings get the most recruiter attention in the first two weeks.
