Commercial Manager
Mactech Energy Group
Leiston · posted 1 August 2026
Job type
contract
Location
Leiston, England
Job Title: Commercial Manager
Location: Based in our Suffolk office, with hybrid working available
Salary: PAYE 415 UMBRELLA 579
Job ID: 2140
Vacancy Overview:
Are you looking for a career which is rewarding, at the cutting edge of project development and where you can really make a difference? Come and join our expanding Sizewell C (SZC) team and work on one of the most exciting and largest megaprojects in the UK, whilst being at the forefront of the UK's climate change agenda and energy policy. Following on from the success of Hinkley Point C (HPC), the SZC Project is a nuclear new build project in Suffolk, which has obtained planning approval and Government financing support. The project has started construction and is now seeking private investment. When completed, it will provide dependable electricity to 6 million homes for 60 years, which along with renewables, will support Britain to achieve Net Zero by 2050.
Job Purpose / Overview
The Commercial Manager is commercially responsible, on any contract assigned to them, for all pre and post contract commercial issues relating to a contract on the SZC project.
The Commercial Manager is an important role within the SZC Supply Chain Group with accountability to the Senior Commercial Manager for the successful commercial administration of one or more SZC contracts. As such the Commercial Manager is empowered to make decisions around the Principle Accountability areas, under the overall guidance of the Senior Commercial Manager and in accordance with delegated levels of authority.
The Commercial Manager will be the primary point of commercial contact on the contract/s assigned to them and will be required to work closely and pro-actively with the other stakeholders at all levels and across all the teams within Nuclear New Build to ensure that the requirements of the individual contracts and their impact upon the overall SZC Project are successfully delivered.
The Commercial Manager is responsible and accountable for:
The day-to-day management of Supply Chain Assistants under their control.
Providing support to the procurement process during the Procurement phase (pre-award).
Providing commercial management of contracts during the execution phase (post-award).
Providing commercial management for the delivery of contract final account agreements (close out).
Responsible for the delivery of the contract in accordance with SZC governance requirements to meet SZC Project and business objectives.
Professional development of self and people within the team.
Principal Accountabilities
Procurement Phase:
Providing support to the procurement process and Senior Commercial Manager/Supply Chain Lead 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. Part of this will include participating in the Commercial Review of the technical and commercial requirements, ensuring that the specifications and commercial terms of the contract including Scope of Works, Required Services, Planning, Safety and Quality Standards etc., are aligned across the Project and ensuring that the commercial terms will allow effective contract administration.
The 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, preparation of contract-specific progress reports and reporting
Maintaining procurement and contract commercial files and records
Interfacing with Legal team on conditions of contract issues and non-disclosure agreements
Ensure that the strategy for collaborative working is followed in the procurement phase
Development of ITT/RFQ packages including technical, commercial, legal documentation
Ensure lessons learnt from HPC are captured and implemented in SZC procurement strategy
The Commercial Manager will provide support to the Senior Commercial Manager / Supply Chain Lead in ensuring all internal governance approval is in place to enable timely Contract Award.
Knowledge, Skills, Qualifications, Experience
Progressing to full membership of the RICS / CICES / IOB is preferable.
Educated to relevant degree level is preferable.
Able to demonstrate a noteworthy track record of administering successful contracts.
Effective commercial / contract management skills are essential, with clear knowledge of best practice contract methodologies.
Good commercial skills and ability to make sound decisions on matters of financial value.
Understanding of contract performance measurement, risk management and change and claim management.
Good negotiating, influencing and communication skills to command professional respect at all levels.
Familiarity with most common Forms of Contract (NEC & FIDIC) within the power construction industry and major projects and programme environment; with particular knowledge of UK Law and its impact upon the contract and commercial function is essential.
Familiar with the nuclear site licence conditions and the nuclear baseline philosophy.
Good understanding of the UK regulatory framework.
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