Accounts Assistant - 6 month FTC in City of Westminster

The Finance Team is led by the CFO and structured across two specialist areas: FP&A, which partners with the business on planning, forecasting and commercial decision‑making; and Financial Control, which owns the integrity of our numbers, core operations, and financial controls. This role sits within Financial Control, reporting directly to the Financial Controller.

As Accounts Assistant, you'll keep the engine running. You'll be the first point of contact for finance queries, own the purchase ledger end‑to‑end, support month‑end close, and help manage corporate cash movements and reconciliations. Process matters here - and so does the judgement to know when to elevate. You'll work closely with the Financial Controller and Head of Finance, contributing to audits, payroll processing, and identifying where things can be done better.

What you’ll do:

• Process supplier invoices accurately and on time, ensuring correct coding and authorisation
• Raise sales invoices and manage the collection of outstanding debts
• Monitor aged debtors and creditors, escalating where appropriate
• Process and reimburse employee expense claims in line with company policy and HMRC guidelines
• Perform daily bank reconciliations across multiple accounts
• Post cash receipts and payments to the ledger
• Assist with cashflow monitoring and reporting
• Support the month-end close process, including journal postings and accruals
• Assist with the preparation of management accounts and financial reports
• Maintain fixed asset registers and process depreciation entries
• Produce ONS reports
• Maintain accurate, up-to-date financial records and filing systems
• Respond to internal and external finance queries professionally and promptly
• Assist with year-end audit preparation and provide supporting documentation
• Identify opportunities for process improvement across the finance function

What you’ll bring:

Must haves:

• At least one to two years' experience in an accounts or finance role
• Solid grounding in double-entry bookkeeping and core accounting principles
• Confident in Excel - VLOOKUPs, pivot tables, and standard formulas
• Experience with accounting software such as Workday, Xero, QuickBooks or similar
• Strong numerical accuracy and exceptional attention to detail
• Clear, organised, and able to manage a varied workload without losing pace

Nice to haves:

• Previous experience in a similar industry or finance shared services environment
• AAT Level 2 or above, or part-qualified ACCA or ACA
• Familiarity with cloud-based accounting platforms
• An interest in learning SQL for data querying and financial reporting

How we reward you:

At Flagstone, the benefits extend beyond false gifts like "fruit and snacks". Instead, we invest in your health, wealth, and professional development. Here's a selection of our benefits:

• Hybrid working - Spend at least 1 day a week with your team in our collaborative London office
• Flexible benefits budget - a pot to fund meaningful benefits for you, whether it's hormone or fertility testing, cancer screening, neuro-diversity coaching or something that matters for you.
• A range of salary sacrifice options to help you make tax efficient savings on electric cars, nursery schemes, home and tech goods.
• Mental wellbeing support - Access therapy and mental health sessions through Spill
• Learning and development - £1,000 personal development budget to help you grow in your role.
• Private health care - Enjoy all the benefits AXA has to offer, including reduced gym memberships and medical history disregarded
• Medical cash plan - To help you with the costs of dental and optical expenses
• Life insurance and Income Protection- four times your annual salary for peace of mind
• Matched pension contributions up to 5%
• 25 days holiday - plus bank holidays, well-being days and volunteering days
• Enhanced Parental Leave - enhanced maternity, paternity and adoption pay.

All are welcome. At Flagstone, we're assembling a diverse team that defies our industry's norms.