Sales Invoicing Administrator at NSS Group

Location: Leeds (Hybrid – 3 days office, 2 days home after probation)

Salary: £24,000 per annum

Department: Finance

Looking for your next step in finance?

If you’re organised, detail-focused, and enjoy problem-solving, this could be the perfect opportunity for you. NSS Group is a growing national business, and we’re looking for a Sales Invoicing Administrator to join our Finance team in Leeds.

You’ll play a vital role in ensuring our customers are billed accurately and on time, helping to keep cashflow strong and our business moving forward. In return, you’ll get the chance to work in a supportive team, benefit from hybrid working, and enjoy genuine opportunities to develop your career.

About NSS Group

NSS is proud to hold Platinum accreditation from Investors in People. We are a specialist property services provider, delivering everything from building maintenance and window cleaning to platform hire and equipment testing. With our dependable, in-house team, we work 24/7 across the UK, setting new standards for safety, speed, and reliability. 

What We’re Looking For

The ideal candidate will bring:

• Previous invoicing experience (property or facilities management sector experience preferred).

• Strong organisational skills and the ability to manage your own workload effectively.

• A methodical, problem-solving approach and resilience under pressure.

• Excellent communication skills—confident liaising with both customers and colleagues.

• Proficiency in Excel and other business software, with strong data analysis skills.

• A collaborative attitude and enthusiasm for working within a growing team.

Key Responsibilities

• Deliver customer invoices accurately and on time, with correct supporting documentation, for both key and non-key accounts.

• Upload invoices to customer portals in line with client requirements.

• Monitor and enforce customer PO compliance across the business, escalating where required.

• Resolve invoicing issues by liaising with other departments to ensure smooth resolution.

• Maintain accurate records of invoiced and un-invoiced work, ensuring alignment with financial records.

• Regularly update the Cleaning Division’s operations team on the status of un-invoiced work.

• Ensure invoicing backlogs are minimised to optimise business cashflow.

• Meet all agreed deadlines set by your Line Manager.

Our Recruitment Process

To ensure a fair and unbiased recruitment process, we work with Hubert.ai.
After applying, you’ll be invited to complete a chat-based interview with our virtual recruitment assistant, Hubert.

The interview takes around 15–20 minutes.

You can find helpful tips here: Hubert Interview Advice

What NSS will give to you:

• Free onsite parking

• Free refreshments with a friendly and sociable office environment

• An opportunity to progress and develop within the company

• 25 days annual holiday + bank holidays

• Monthly Reward and Recognition Scheme where our top performers are rewarded with vouchers for many retailers

• Trade Point Card which will enable you to get 10% off at any B&Q

• Day off for your birthday after length of service

• Eye care vouchers

• Referral bonus scheme

• Medicash health cash plan with discount on dental, health screening, gym discount, store discounts, specialist consultations and much more

• Hybrid working arrangement (3 days office based, 2 days working from home) available upon successful completion of probation period.

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