Commercial Management Consultant - Cost and Commercial Assurance

Assystem, Switch On; Greater London; Hybrid; GBP 40,000 - 60,000; Full time

Job summary

A leading engineering and digital services company in the UK seeks a Cost & Commercial Assurance Consultant to join their growing Audit & Assurance team. In this role, you will perform cost, commercial, and contract assurance reviews on major infrastructure projects while working closely with the Audit & Assurance Lead. The ideal candidate should have experience in audit or commercial assurance within construction, possess strong analytical skills, and demonstrate high integrity. The position offers opportunities for hybrid working with national travel involved.

Qualifications

• Proven experience in audit within construction or infrastructure.
• High integrity and attention to detail in work.
• Flexibility to travel nationally (2-3 days per week).

Responsibilities

• Deliver cost, commercial and contract assurance reviews.
• Analyse financial datasets and produce audit findings.
• Prepare high-quality audit reports with recommendations.
• Build strong relationships with clients and stakeholders.

Skills

Experience in audit, cost verification or commercial assurance

Strong understanding of NEC contracts

Confidence working with large datasets

Excellent audit report writing skills

Strong IT capabilities

High integrity and attention to detail

Education

Relevant degree in commercial management, accounting or audit

Professional membership (RICS, CIMA, ACCA, AAT or similar)

Tools

IDEA audit software

Advanced Excel

Job description

Company Description

Assystem is an international engineering and digital services company with a single mission : to accelerate the global transition to low-carbon energy.

Every day, our 8,000 “Switchers” across 12 countries bring their expertise, curiosity and collective intelligence to the challenge of the century—building a cleaner, safer and more sustainable energy future.

We work alongside the organisations driving this transition, sharing our knowledge and values to deliver innovative solutions and new ways of thinking. With more than 55 years of experience in highly regulated industries, we provide engineering, project management and digital services that enhance the performance, safety and longevity of complex infrastructure throughout its lifecycle.

Ranked among the world’s leading nuclear engineering companies, Assystem is committed to delivering a viable, efficient and reliable energy future for all.

Job Description

Our Audit & Assurance team is growing as we support an increasing portfolio of large, complex and commercially sensitive UK infrastructure programmes. We’re now looking for a Cost & Commercial Assurance Consultant to help deliver high-quality audit and assurance work and strengthen our capability as the function expands.

In this role, you’ll work closely with the Audit & Assurance Lead and wider team, carrying out cost, contract and commercial assurance reviews that give clients confidence in their project performance. You’ll analyse large datasets, apply structured audit methodologies and produce clear, evidence-based reports. Alongside delivery, you’ll play a part in shaping how our service evolves—sharing insights, supporting colleagues and helping us continuously improve.

You’ll join a community with deep expertise across the UK’s most significant infrastructure programmes. We offer hybrid working, development opportunities and a culture that values integrity, diversity and evidence-driven thinking. The role includes national travel, typically two to three nights per week.

What you’ll be doing :

• Deliver cost, commercial and contract assurance reviews on major infrastructure projects
• Analyse financial datasets, ledgers and evidence to produce clear audit findings
• Use IDEA audit software to support consistent and efficient delivery
• Prepare high-quality audit reports with actionable recommendations
• Support planning, reporting and knowledge development within the team
• Build strong relationships with clients and internal stakeholders
• Contribute to continuous improvement and mentoring across the team

Qualifications

What you’ll bring :

• Experience in audit, cost verification or commercial assurance within construction or infrastructure
• Strong understanding of NEC contracts from a cost / commercial perspective
• Confidence working with large datasets and financial information
• Excellent audit report writing and analytical skills
• Strong IT capabilities, including audit software and advanced Excel
• Background in QS, commercial management, accounting or audit, supported by a relevant degree
• Professional membership (RICS, CIMA, ACCA, AAT or similar) preferred
• High integrity, attention to detail and a completer–finisher mindset
• Flexibility to travel nationally (2-3 days per week)

Additional Information

We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future