Billing Assistant

An exciting opportunity to join a collaborative and supportive Billing Team within a respected London‑based international law firm.
Are you looking to develop your billing expertise in a role that sits at the heart of the firm's financial operations? This position offers hands‑on responsibility, exposure to stakeholders across the business, and the chance to strengthen your technical and professional skills within a friendly and high‑performing finance environment.

The Opportunity

We are seeking a proactive, detail‑focused Billing Assistant to support the accurate and efficient processing of the firm's billing cycle. You will play a vital role in helping lawyers, PAs and the wider finance function deliver timely and compliant billing. Working within a supportive team, you'll contribute to ongoing improvements, system updates and best‑practice processes.
It's a role where organisation, accuracy and excellent communication are essential, and where your contribution will directly support the firm's financial success.

Key Responsibilities

• Take ownership of the full billing cycle, ensuring all matters are produced accurately, formatted correctly, and issued within required timeframes.
• Act as a key liaison for billing enquiries, offering clear guidance to fee earners, PAs and wider internal teams.
• Handle the daily processing of bills and credit notes in 3E, maintaining adherence to internal controls and SRA Accounts Rules.
• Prepare and supply financial information such as draft bills, WIP summaries, matter reviews and detailed time narratives.
• Work across departments to support time transfers, write‑offs and other adjustments where required.
• Collaborate with the Credit Control team to address outstanding issues and help maintain strong cashflow.
• Produce and circulate ARCS monthly statements, ensuring information is accurate and up to date.
• Contribute to ongoing improvement projects, including testing, reviewing and assisting with future 3E upgrades or system developments.
• Provide general administrative and project‑based support to the wider Finance team when needed.

About You

You'll thrive in this position if you:

• Have previous experience in a billing role, ideally within a law firm environment.
• Bring strong working knowledge of 3E.
• Possess excellent organisational and time‑management skills, particularly around month‑end and key deadlines.
• Are confident communicating with stakeholders at all levels, internal and external.
• Demonstrate a high level of accuracy and attention to detail when handling financial data and compliance requirements.
• Are proficient with Microsoft Office (especially Excel), and quick to learn new systems.

What You'll Receive

• Competitive salary
• 25 days annual leave
• Permanent Health Insurance
• Life Assurance
• Interest‑free Season Ticket Loan
• Private Healthcare
• Pension Scheme
• Staff Introductory Scheme
• Employee Assistance Programme

If this job isn't quite right for you, but you know someone who would be great at this role, why not take advantage of our referral scheme? We offer £200 in shopping vouchers for every referred candidate who we place in a role. Terms & Conditions Apply. https://www.ambition.co.uk/refer-a-friend