Accounts Payable Assistant

IONATE

Accounts Payable Assistant supporting finance for IONATE, a technology scale-up in smart electricity grids. Focusing on invoice processing and purchase-to-pay cycle management.

Posted 5/27/2026full-timeLondon • 🇬🇧 United KingdomMid-LevelSenior💰 £30,000 - £34,000 per yearWebsite

About the role

Key responsibilities & impact

Own the end-to-end AP process: invoice capture, coding, approvals, posting, and payment
Be the first point of contact for supplier and internal AP queries; resolve discrepancies promptly and professionally
Process purchase invoices and credit notes in ExpenseIn and Xero (including multi-currency), ensuring correct VAT/tax treatment where applicable
Manage employee expenses and company credit card transactions, ensuring policy compliance and accurate coding
Maintain the purchase order process: ensure POs are raised for committed spend, obtain approvals, and match PO to invoices
Prepare weekly payment runs and ad-hoc payments, ensuring payments follow approval controls and agreed supplier terms
Reconcile supplier accounts and statements; investigate and clear aged items, duplicates, and unmatched transactions
Perform bank reconciliations and support month-end close activities related to AP
Manage the Finance shared mailbox, prioritising queries and maintaining clear audit trails
Support onboarding and maintenance of supplier master data (e.g., bank details) in line with internal controls
Manage HMRC customs reporting requirements and payments relating to import taxes on supplies
Provide reporting and supporting documentation for financial reporting and audit requests, and contribute to continuous improvement initiatives

Requirements

What you’ll need

Proven experience in a purchase ledger / accounts payable role, with a good understanding of the end-to-end AP process
Experience working in a small, fast-paced team
Exceptional communication skills
Excellent attention to detail and a high level of accuracy when processing transactions
Strong organisational skills and ability to prioritise workload and meet deadlines (including payment run cut-offs)
Experience processing invoices, expenses, and payments
Confident using accounting systems (experience with Xero is required)
Intermediate Excel skills (e.g., pivots, lookups) and comfortable working with numerate data
Professional, helpful approach to stakeholder and supplier query resolution
**It would be useful to have:**
Experience with ExpenseIn (or another expense/invoice workflow tool)
Exposure to multi-currency processing and/or import duties and customs documentation

Benefits

Comp & perks

Employee Option Plan: You get equity in IONATE, so as we succeed so do you.
Private Medical & Dental Insurance: From day one, we provide you with full, comprehensive private medical and dental cover through Bupa. You also have the option to add any dependents to your cover. Please ask us for more details.
Company pension: a flexible, and sustainable pension product to help you plan for your future.
Career Development: It’s important to us that you have the opportunity for ongoing professional development and career growth. You will receive an annual budget for professional development and work with your team to set and reach goals every year.
Flexible working schedules: You will be based in our modern West London offices 3 days per week and will have the flexibility for hybrid work-from-home arrangements. Talk to us at the application process about this.
Cycle to Work Scheme: Low carbon travel is important for everyone, so we have in place a cycle scheme to help you purchase a bicycle.
Slow travel: We believe in a low carbon future, so if you wish to travel by a lower carbon method – but it takes much longer than flying - we will give you an extra 2 slow travel days per year.

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

purchase ledgeraccounts payableinvoice processingexpense managementbank reconciliationfinancial reportingVAT/tax treatmentmulti-currency processingExcelcustoms documentation

Soft Skills

communicationattention to detailorganisational skillsprioritisationproblem-solvingprofessionalismteamworkstakeholder managementaccuracycontinuous improvement