Billing & Invoice Assistant

Billing & Invoice Assistant - Hybrid - 2 days working in the office and 3 days from home

3-month temporary assignment

We are looking for a highly organised and detail-driven Billing & Invoice Assistant to join a Finance and Account Management team. In this role, you will ensure the accurate capture, recording, and processing of all materials and subcontractor costs within our billing systems-maximising the recovery of costs and supporting financial efficiency across the organisation.

You will play a vital role in analysing cost recovery ratios, supporting end-to-end billing processes, and improving the quality and accuracy of submissions to our clients. This position is ideal for someone who thrives in a fast-paced environment, has excellent attention to detail, and enjoys collaborating across Finance, Operations, and Supply Chain teams.

• Manage the full billing cycle, ensuring accurate invoice generation, verification, and submission to clients.
• Provide day-to-day support with client billing applications, ensuring accurate submission via billing trackers.
• Proactively engage with subcontractors to ensure timely receipt of required documentation and invoices.
• Ensure all out-of-scope or fully chargeable costs are captured within client systems to maximise cost recovery.
• Contribute to supplier reviews and recommend improvements where appropriate.
• Produce analysis and reports on cost recovery ratios, identifying gaps and recommending corrective actions.
• Review reactive applications for accuracy, compliance, and correct categorisation.
• Ensure correct mark-ups are applied to protect company margins on reactive works.
• Support the billing process by ensuring third parties complete their actions according to the cadence tracker.
• Work with supply chain and contract support to resolve rejected works for resubmission.
• Troubleshoot billing discrepancies and system errors, supporting system development improvements.
• Act as a liaison between Finance, Operations, IT, and third-party suppliers.
• Work closely with Finance teams to ensure compliance with internal billing processes and financial controls.

Qualifications

• GCSE Maths and English (or equivalent).
• Studying towards an accountancy qualification (desirable).
• Intermediate Excel skills.

Experience & Competencies

• Strong background working with demanding deadlines.
• Exceptional attention to detail with a high level of accuracy.
• Confident interpersonal and communication skills for client and supplier interaction.
• Experience within a Sales Ledger or similar billing environment.
• Proficient with Excel and accounting/finance software.
• Ability to work under pressure, adapt to changing priorities, and handle a high-volume workload