Commercial Assistant

Job in Greater London, London, Greater London, W1B, England, UK

Listing for: Cornerstone

Full Time position
Listed on 2026-06-04

Job specializations:

Administrative/Clerical
Office Administrator/ Coordinator, Business Administration, Data Entry
Business
Office Administrator/ Coordinator, Business Administration

Salary/Wage Range or Industry Benchmark: 29900 - 40000 GBP Yearly GBP 29900.00 40000.00 YEAR

Location: Greater London

Commercial Assistant

Flexible Southern SGN Location (Horsham, Portsmouth and Epsom)

£29.9k - £40k per annum (dependent on skills and qualifications)

Full Time | Hybrid

Joint-contribution pension from 6% (12% total) – Enhanced maternity & family leave – Life assurance – Holiday Plus – Virtual GP & Employee Assistance Programme plus retail and leisure discounts & many more.

Job

SGN is seeking a proactive and organised Commercial Assistant to join our Supplier Management team. This is an excellent opportunity to develop a career in commercial and contract management within a regulated and operationally critical industry.

The overall purpose of this role is to provide commercial and administrative support across the Supplier Management function, ensuring effective contract administration, accurate commercial records and consistent support to operational and commercial activities.

The role supports Commercial Managers and Lead Commercial Managers in the management of contractor payments, commercial governance, variation tracking, reporting and compliance activities across allocated contracts and regions.

Responsibilities

Supporting the contractor payment and certification process
Maintaining accurate commercial records, trackers and documentation
Supporting variation management and commercial governance activities
Assisting with reporting, audit and compliance requirements
Providing administrative and commercial support across Supplier Management activities
Supporting consistency and continuous improvement across commercial processes and ways of working

Qualifications

Organisational, administrative and numeracy skills
Good attention to detail and ability to maintain accurate records
Experience working with financial, commercial, or contract administration processes desirable
Good working knowledge of Microsoft Office applications including Excel, Word and Share Point
Ability to work collaboratively across teams and manage multiple priorities

Desirable Experience

Experience with in utilities, construction, infrastructure or regulated industries
Exposure to NEC contracts and/or Construction Act processes
Experience supporting commercial, procurement or supplier management functions

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