Senior Financial Accountant

Senior Financial Accountant

Location: London, E14 9SH

Hours: 37.5 per week

Contract Type: Permanent

Shape strategic finance with precision, insight, and leadership.

ISS UK Ltd is seeking a technically strong and commercially aware Senior Financial Accountant to join our UK & Ireland Controlling function. This is a critical position for a fully qualified accountant with experience across technical reporting, financial controls, and team leadership — someone who can confidently navigate complex portfolios, support decision-making, and drive operational excellence.

If you thrive in a fast-paced, high-accountability environment where your technical knowledge and leadership make a visible impact — this is the role for you.

What You’ll Be Doing

This role blends rigorous technical accounting with hands-on leadership and cross-functional collaboration. You’ll oversee a portfolio of intricate contracts, manage the financial month-end close, and support strategic reporting with accurate, timely data.

From spearheading corporate consolidations to addressing audit queries and leading budgeting cycles — you’ll play a key role in shaping financial integrity and supporting the wider business with insight and control.

Key Responsibilities

• Skillfully orchestrate month-end close procedures to ensure seamless, timely financial closure
• Conduct detailed P&L and balance sheet reviews, providing clear insight to support strategic decision-making
• Manage and nurture a portfolio of complex customer contracts, ensuring financial accuracy and control
• Support and coordinate statutory and group reporting under IFRS and UK GAAP
• Lead and support the coordination of internal and external audits, including addressing audit queries with precision
• Contribute to corporate consolidation and group-level submissions within the central finance team
• Drive forecasting, budgeting, and variance analysis processes across multiple business units
• Apply in-depth knowledge of project accounting to support accurate revenue and cost recognition
• Evaluate and challenge existing financial processes to drive transformation, simplification, and standardisation
• Lead and develop junior team members, fostering a culture of high performance and continuous improvement
• Act as a trusted business partner, balancing technical compliance with commercial pragmatism

What We’re Looking For

• Fully qualified accountant (ACCA, ACA, CIMA) – essential
• Strong technical accounting expertise, including solid understanding of IFRS, UK GAAP, and financial control frameworks
• Proven experience in financial accounting, audit readiness, and supporting consolidations in a complex organisation
• Strong commercial acumen with the ability to interpret numbers and communicate insight to stakeholders
• Excellent Excel skills and familiarity with large ERP systems (e.g. SAP, Oracle, NetSuite)
• Confident and proactive communicator with a continuous improvement mindset
• Track record of process optimisation and experience working across cross-functional projects

Why Work for ISS?

ISS is a global leader in workplace and facility management. We connect people and places to make the world work better — from airports and hospitals to innovation hubs and global head offices.

Join a finance team where technical excellence meets business partnership. You’ll be supported, empowered, and given space to lead, challenge, and innovate.

We offer:

• The opportunity to lead in a technically demanding and commercially relevant role
• A collaborative, supportive team environment with career development opportunities
• A chance to make a real impact on process, control, and performance in a global business

Diversity and Inclusion at ISS

ISS is proud to be an inclusive employer. We welcome applications from all backgrounds and experiences. We are committed to creating a workplace where everyone feels respected, supported, and empowered to thrive.