Location
London with hybrid working and occasional travel to client sites.

Hours
Full Time

Salary
Negotiable

About the Role
Arcadis is the world's leading company delivering sustainable design, engineering, and consultancy solutions for natural and built assets. With over 34,000 people in more than 30 countries, we are dedicated to improving quality of life by solving complex challenges together.
As a Senior Cost Consultant within our Cost and Commercial Assurance (CCA) practice, you will support assurance reviews on major programmes, focusing on NEC3/NEC4 Option C (Target Cost) and/or Option E (Cost Reimbursable) contracts. You will apply core Quantity Surveying skills and commercial audit techniques to validate costs, strengthen contract controls, and provide actionable insights. This role combines traditional QS expertise with digital tools to improve efficiency and transparency.
Your responsibilities will include planning and delivering cost and commercial assurance reviews on NEC Option C/E projects, including open-book validation, pain/gain calculations, fee/risk allowances, and disallowed costs. You will support payroll and timesheet audits, cost verification across labour, plant, materials, and subcontractors, and reconcile samples to source records while testing rates, accruals, and invoices.
You will review compensation events, early warnings, and target movements, providing evidence-based analysis to support dispute avoidance. Assessing contract compliance and commercial control frameworks, you will contribute to recommendations for process, data, and reporting improvements. You will prepare clear findings reports and dashboards for project teams, present outcomes, and assist in closing actions.
Utilising data and low-code/no-code tools such as Excel/Power Query and Power BI, you will automate testing and analytics to improve efficiency and transparency in assurance processes.

Experience
- Degree in Quantity Surveying, Commercial Management, or related field
- Professional membership (RICS, CICES or equivalent)
- Experience with NEC3/NEC4 contracts (Option C and/or Option E)
- Exposure to commercial or payroll audits on projects or frameworks
- Core Quantity Surveying skills including measurement, estimating, valuation, change control, and forecasting
- Ability to interpret datasets and trace costs to source evidence
- Proficiency with Excel and data analysis tools
- Experience using Power Query, Power Automate; basic knowledge of SQL or Python is advantageous
- Sector experience in infrastructure such as transport, water, or energy

About you
Strong communication and stakeholder engagement skills with the ability to challenge constructively and support corrective actions. A curiosity for digital tools and low-code/no-code solutions to enhance traditional QS practices. Motivated to work collaboratively in a dynamic environment and contribute to sustainable outcomes.

Qualifications
Degree and professional membership as noted above. Demonstrated competence in commercial assurance and cost consultancy within complex contractual frameworks.