Transactional Team Leader in London

NIS Holdings Ltd is a private investment holding company based in the United Kingdom. The company operates through two major subsidiaries that provide specialist engineering and manufacturing services across diverse sectors, including nuclear and defence:

• NIS Ltd: A provider of bespoke design and manufacture for plant and equipment, particularly for civil and defence nuclear sectors, science, and technology.
• NSG Environmental Ltd: Focuses on nuclear decommissioning, waste management, and environmental services.

The Transactional Team Leader will oversee the day-to-day operation of accounts receivable, accounts payable, credit card, and petty cash processes. They will uphold and drive accurate and timely processing of sales invoicing, credit control, requisitions, purchase orders, goods receipting, invoice matching, and supplier payments.

Leading a small team, initially of three, the Team Leader will allocate workload, provide coaching, strengthen controls, improve efficiency, and ensure a consistent, high-quality service. They will champion best practice, build capability, and support a proactive, service-focused culture.

Working closely with the Procurement Department, the Team Leader will help maintain strong purchasing discipline across the organisation. They will act as the first point of escalation for internal teams and suppliers, resolving disputes quickly and reducing aged creditor items to maintain strong payment practice standards.

A key focus of the role is improving process efficiency, data quality, behaviours, and compliance across the P2P cycle. The Team Leader will monitor KPIs, reduce exceptions and disputes, and support a clean month-end close through effective GRNI management, strong controls, and accurate cut-off.

The role also plays a key part in strengthening financial governance and ensuring policies are consistently applied across the Group. The Team Leader will build strong relationships across Finance, Procurement, Operations, and Site teams, supporting a collaborative service culture and becoming a trusted partner to the business.

This is a new role that enables Finance to deliver strategic aims and strengthen the end-to-end sales and purchasing process across the business. The Team Leader will have close support from the Group Financial Controller but will have clear scope to take ownership, drive meaningful improvements, and shape how the transactional finance function operates going forward.

Key Objectives

• Transactional Ownership: Take ownership of routine transactional delivery across both purchase ledger and sales. Ensure purchase orders, goods receipting, invoice matching, and payment preparation are completed accurately and to agreed timeframes.
• Sales Processing and Credit Control: Ensure sales transactions are processed correctly and debtor balances monitored. Maintain simple but effective credit control routines.
• Supplier Master Data: Maintain clean and controlled vendor records, verifying bank detail changes, performing compliance checks, and preventing duplications or fraud risks.
• Credit Cards and Petty Cash Management: Oversee the administration, reconciliation, and control of company credit card spend and petty cash.
• Mailbox Rota / Service Standards: Coordinate the shared inbox rota, triage queries, and ensure response and resolution SLAs are met.
• Team Leadership and Development: Allocate workload, support team members, and provide coaching on good practice.
• Behavioural Improvement and Process Efficiency: Monitor KPIs and identify the root causes of recurring issues.
• Reporting, Insight & Dashboard Development: Support the development, maintenance, and publication of dashboards and reporting that provide visibility over P2P performance.
• Dispute Resolution: Act as the first escalation point for internal queries and supplier disputes.
• Month-End and Audit Support: Support month-end activity by contributing to GRNI review, accruals, cut-off accuracy, and reconciliation work.
• Contribution to Improvement and Change Projects: Actively contribute to broader improvement initiatives.

Person Specification

• Qualifications: Good standard of education (GCSE or equivalent, including Maths & English) - Essential; AAT Level 3 or above, or equivalent bookkeeping qualification - Desirable.
• Experience & Knowledge: Supervision of an AP/purchase ledger team with direct reports - Essential; End-to-end P2P: PO, receipting/GRN, matching, invoice workflow and payment runs - Essential.
• Skills & Abilities: Strong IT skills, including MS Excel. Competent user of MS Office - Essential; Clear written & verbal communication, steady with challenging conversations - Essential.

Package: Life Assurance 3x Salary; Pension – Company contributes 5%, Individual contributes 4%; Discretionary bonus; 187.5 hours per year holiday allowance; Professional memberships covered; Large Training and Development budget available.

NSG Environmental are a Disability Confident Committed Employer.