AP & Treasury Manager, Asset Management Finance, Northern Europe in Kings Langley

Do you want to work to make Power for Good? We're the world's largest independent renewable energy company. We're guided by a simple yet powerful vision: to create a future where everyone has access to affordable, zero carbon energy. We know that achieving our ambitions would be impossible without our people. Because we're tackling some of the world's toughest problems, we need the very best people to help us. They're our most important asset so that's why we continually invest in them.

RES is a family with a diverse workforce, and we are dedicated to the personal professional growth of our people, no matter what stage of their career they're at. We can promise you rewarding work which makes a real impact, the chance to learn from inspiring colleagues from across a growing, global network and opportunities to grow personally and professionally. Our competitive package offers a wide range of benefits and rewards.

The position is responsible for AP and treasury operations for an assigned client portfolio, reporting to the Finance Manager – Process Improvements, Finance Asset Management with a dotted line to Client Finance Managers. The role carries full end-to-end accountability for accounts payable, banking and treasury operations, IFS power-user support, and team management.

Please note that this role is being offered on an 18-month fixed term contract basis.

Organisational context: The FAM Northern Europe team acts as an outsourced finance business partner, delivering financial support services under Management Service Agreements (MSAs) to clients owning renewable energy assets across onshore wind, solar, storage and hydro. The department currently manages over 200 legal entities across 17 clients and three regions (UK & Ireland, Nordics and Germany).

The team's scope includes:

• Purchase Ledger: >22,500 invoices per annum
• Banking: 300 bank accounts
• Treasury: cash processing, banking platform management and bank mandate administration
• IFS super-user support
• Business user support for Accounts Payable transactions
• Month end, quarter end and year end processing to agreed deadlines

Key accountabilities:

• Team Leadership & Management
  • Lead, manage and develop a team of AP & Treasury professionals, setting clear expectations and supporting professional growth.
  • Allocate and monitor clerk workload to ensure even distribution and timely delivery across all assigned clients.
  • Act as first escalation point for all AP and treasury issues within the portfolio.
  • Conduct regular one-to-ones and performance conversations with direct reports.
  • Support the onboarding and training of new team members within the portfolio.
  • Maintain regular contact with Client Leads and other AP & Treasury Managers.
  • Support and cover the wider FAM NE team as required.
  • Manage team absence and absence records and pull together cover plans to ensure smooth running of portfolio.
• Accounts Payable
  • Own the end-to-end AP process for all assigned clients, from invoice receipt through to payment and reconciliation.
  • Ensure all supplier invoices are processed accurately, correctly coded and posted on time.
  • Manage payment proposals and oversee payment run processes, ensuring dual-control requirements are met at every stage.
  • Act as primary escalation for supplier queries, approval workflow delays and invoice disputes.
  • Oversee the processing of urgent and manual payments.
  • Maintain supplier master data integrity.
  • Support month-end, quarter-end and year-end close to agreed deadlines.
  • Regularly review the POAs and creditors ledger ensuring creditors balances are kept clean and up to date.
  • Manage out of system payments such as distributions, loan repayments & VAT payments.
  • Carry out bank approval of intercompany transfers.
• Treasury & Banking
  • Own the treasury matrix and bank mandate register for all cluster clients.
  • Act as primary contact with banks for mandate changes, signatory updates and approval limit amendments.
  • Effectively implement and manage the bank access for every client account.
  • Oversee bank uploads and payment approvals, ensuring dual-signatory controls are applied before any payment is released.
  • Oversee daily bank reconciliations across all cluster entities; resolve discrepancies promptly.
  • Conduct and document quarterly bank access reviews.
  • Maintain the letter tracker for all bank correspondence.
• IFS & Systems Administration
  • Act as a power user within the IFS system, supporting team members on system operations.
  • Collaborate with the IFS team on testing, training, and system improvements.
  • Contribute to continuous improvement initiatives within the team and across the wider department.
• Client & Stakeholder Management
  • Act as primary client contact for AP and treasury matters across all assigned clients.
  • Build and maintain strong, trust-based client relationships.
  • Communicate proactively on issues, process changes and service updates.
  • Manage multiple client priorities simultaneously without compromising quality or timelines.
  • Represent the FAM NE team professionally at all levels of seniority.
• Controls & Compliance
  • Ensure all AP and treasury controls always operate effectively within the portfolio.
  • Maintain up-to-date process documentation for every assigned client.
  • Enforce fraud prevention controls.
  • Support internal and external audit requests.
  • Identify and escalate control weaknesses to the Head of FAM NE.

Knowledge & Skills

• Strong working knowledge of accounts payable, purchase ledger and treasury operations.
• Hands-on experience with banking platforms, mandate management and payment authorisation frameworks.
• Proficient in IFS or equivalent ERP system.
• Experience managing high-volume AP portfolios, ideally 50+ entities.
• Ability to lead and develop a small finance team.
• Excellent attention to detail with a track record of delivering accurate, timely work under pressure.
• Strong client relationship skills.
• Proactive approach to identifying and resolving problems.

Experience & Qualifications

• Significant experience in a transactional finance role, ideally within asset management or financial services.
• Proven experience managing or supervising a small finance team.
• Demonstrated experience with treasury and banking operations.
• Recognised accountancy qualification (e.g. AAT, part-qualified ACCA/CIMA or equivalent).

At RES we celebrate difference as we know it makes our company a great place to work. Encouraging applicants with different backgrounds, ideas and points of view, we create teams who work together to solve complex problems and design practical solutions for our clients.