Finance Assistant in City of Westminster

This is an exciting opportunity to be at the heart of our finance operations, working closely with our two Senior Project Accountants. You will play a vital role in keeping our financial processes running smoothly, ensuring accuracy, and supporting teams across the business. From managing invoices and reconciliations to assisting with audits and client billing, you will gain hands-on experience in a fast-paced environment. We are looking for someone who is meticulous, proactive, and eager to develop within a finance role. You should be detail-oriented, highly organised, and able to manage multiple tasks while keeping a close eye on deadlines. A problem-solving mindset, confidence in taking initiative, and strong communication skills are essential. You should be comfortable working independently while also collaborating with teams across the business.

You will support the finance team with a variety of day-to-day tasks, including, but not limited to:

• Support with managing the WIP list, posting adjustments, and improving ledger accuracy
• Raising and managing project and overhead purchase orders (POs), processing invoices through to payment
• Setting up and managing supplier and client accounts, handling queries as they arise
• Raising client invoices and managing credit control, including working with teams to resolve aged debt issues
• Assisting with preparing balance sheet reviews and making necessary adjustments
• Chasing timesheet completion and running weekly reports for analysis
• Managing company credit card reconciliations, claim submissions, and card reconciliation
• Supporting new staff inductions by demonstrating the timesheet, expenses, and PO system
• Assisting client teams with budgets, financial administration, and supplier setup
• Helping client teams with new system setups
• Providing on-site financial support when required
• Assisting with internal and external MediaOcean issues
• Supporting audit preparations at year-end and pulling together necessary documentation
• Ensuring the smooth running of receivables and payables, including market billing

Qualifications:

• BA degree in Accounting or experience in a similar role is preferable but not necessary
• Strong attention to detail and the ability to prioritise tasks effectively
• Experience with Microsoft Excel at a beginner or intermediate level
• Great written and verbal communication skills
• A collaborative, can-do attitude, working well with teams across the business
• The ability to work independently while also collaborating with a team
• Experience with MediaOcean (DDS, Aura, PostBox, and Flexibill) is desirable but not essential

This role is a great fit for someone looking to build a solid foundation in finance within a dynamic and supportive environment. If you are ready to take on a role where accuracy and teamwork make a real impact, we would love to hear from you. This is a full-time role and you must be eligible to work in the UK.

At Omnicom Media Group, we are committed to supporting flexibility for our people while fostering collaboration, innovation, and teamwork. We have a hybrid working model (three days in the office, two working remotely), to ensure that we meet the needs of both our people and our business, balancing the benefits of in-person connections with the flexibility of remote working. Our standard working hours are 9:30 - 17:30, but we offer the ability to flex around core hours of 10:30 - 16:30 to give our people flexibility on how they manage their working day, whether that is in the office or working remotely. We encourage open conversations between our people and managers to help navigate high-need periods and individual circumstances. Our goal is to create an environment where people feel genuinely supported to do their best - both in their careers and in their lives outside of work.