Senior Project Accountant | Global Architecture and Design Firm | London

The Client

Harmonic is proud to be partnering with one of the world’s most influential design and architecture consultancies. They’re a global leader shaping the future of cities, communities, and the built environment. With an international footprint and multi-billion global revenue, the company combines scale with a strong people-first culture. Their London office fosters a high-performing, collaborative team across finance, design, and leadership, and continues to grow as they win some of the most exciting and complex design projects in the world. There’s excellent opportunity to get involved in clubs, social events, and their London offices are superb. This is a unique opportunity to join one of the most influential design businesses in the world.

The Role

This is a senior, commercially focused project accounting role offering exposure to world-class designers and studio leaders. You will take ownership of the financial performance of major projects (around 100 at any given time) - from initial due diligence through to billing, forecasting, and collections, while partnering closely with senior stakeholders across the business. You’ll act as a trusted financial advisor, helping shape decision-making, improving project performance, and ensuring best-in-class financial discipline across the project lifecycle. This opportunity is ideal for a highly organised, detail-driven professional who thrives in a fast-paced, collaborative environment and enjoys influencing both finance and non-finance stakeholders.

Responsibilities

• Partner with Principals, Studio Leaders, and Design Managers to drive strong project financial performance
• Oversee billing accuracy and financial reporting across projects, studios, and the wider office
• Provide meaningful commercial insight through forecasting, variance analysis, and performance tracking
• Support complex international projects and collaborate with global finance teams
• Train and support Design Managers on project finance processes and best practices
• Manage key client accounts and ensure projects remain financially healthy throughout the lifecycle
• Review project budgets, staffing plans, and fee structures to maximise profitability
• Analyse actual vs. budget performance and present insights to senior leadership
• Coordinate consultant invoicing and payments efficiently
• Review labour and expenses for accuracy and commercial alignment
• Monitor Accounts Receivable and support collection efforts
• Maintain well-structured and compliant project contract documentation

What our client needs to see (required):

• 10+ years of Project Accounting experience within a professional services environment (architecture, design, engineering, or similar)
• Strong commercial understanding of project financials, billing, and lifecycle management
• Advanced Excel skills
• Highly organised with strong attention to detail and accuracy
• Confident communicator able to partner with senior stakeholders
• Ability to manage multiple priorities in a fast-paced environment
• Experience supporting complex, global, or multi-currency projects
• Familiarity with Deltek Vision / Vantagepoint or similar project finance systems
• Track record of improving financial processes, reporting, or systems
• Experience training or mentoring project teams on finance best practices

Location: London (On-Site)

Start Date: ASAP

At Harmonic, we are dedicated to fostering an inclusive and equitable workplace. We actively welcome applications from individuals of all backgrounds and assure you that every candidate will be thoughtfully considered for the roles we represent, without regard to race, religion, gender expression, disability, or sexual orientation.