iso auditor jobs

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.

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

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)

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.