Billing & Invoice Assistant

Billing & Invoice Assistant - Hybrid role (2 days in the office, 3 days working 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 with in 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.