Process and raise sales invoices accurately and in a timely manner, ensuring all billing is completed in line with project milestones, purchase orders, and contractual requirements. * Carry out purchase ledger and sales ledger reconciliations, identifying and resolving discrepancies promptly and escalating where required. * Allocate incoming payments accurately against the correct customer accounts and invoices, maintaining up-to-date and accurate records at all times. * Perform accurate data entry of financial transactions, supplier invoices, expense claims, and other financial records into the accounting system. * Assist with the preparation of month-end financial reports, reconciliation summaries, and supporting documentation. * Monitor outstanding purchase orders and work with the operations and procurement teams to ensure invoices are matched and approved correctly. * Chase outstanding debts and overdue invoices in a professional and timely manner, maintaining positive relationships with customers and clients. * Assist with bank reconciliations and the accurate recording of receipts and payments. * Support the wider finance function with ad-hoc financial administration tasks as required by the Finance Manager. * Maintain organised and accurate financial filing systems, both electronic and paper-based, in line with company procedures and audit requirements. * Liaise effectively with project managers, site staff, and external suppliers to resolve invoice queries and ensure smooth financial processes