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AR & AP Specialist; Maternity Cover

Job in Greater London, London, Greater London, W1B, England, UK
Listing for: Mosaic.tech
Seasonal/Temporary position
Listed on 2026-07-30
Job specializations:
  • Accounting
    Accounts Receivable/ Collections, Bookkeeper/ Accounting Clerk, Accounting Assistant, Accounting & Finance
  • Finance & Banking
    Accounts Receivable/ Collections, Bookkeeper/ Accounting Clerk, Accounting & Finance
Salary/Wage Range or Industry Benchmark: 35000 - 40000 GBP Yearly GBP 35000.00 40000.00 YEAR
Job Description & How to Apply Below
Position: AR & AP Specialist (Maternity Cover)
Location: Greater London

The Company:

Stream was founded with the mission to provide fair financial tools to the everyday worker.

Offered through destination employers like Greene King, Bupa, Burger King, Asda and the NHS, our award-winning platform helps over three million people to earn, learn, save, spend and borrow on their own terms, all in one smartphone app.

Stream is unique: VC backed and growing at scale, but with a social conscience. Some of the world’s leading impact funds were our founding investors, and we operate on a social charter, which means every product and service we create must measurably improve financial wellbeing.

You’d be joining a team of over 300 passionate, ambitious people across Europe and the USA, building a category-defining product, and united by that same mission.

The Opportunity:

We see Finance as an integral part of the Stream machine, and we’re looking for someone who wants to make a meaningful contribution to our high-calibre team. We're looking for an experienced AR & AP Specialist to be the backbone of our function ensuring our growth is supported by accurate and efficient record keeping.

This is a hands-on, operational finance role covering both accounts receivable and accounts payable, with a broad range of responsibilities across invoicing, bank reconciliation, client query management, expense and supplier invoice processing.

The Team:

You will be joining a highly collaborative Finance team and report directly to the Group Financial Controller. As the AR & AP Specialist, you’ll manage two inboxes (AR and AP), ensuring all queries are responded to quickly and professionally, ensure timely processing of invoices, expenses and card related costs, reconcile the bank and issue invoices to customers.

You also have the opportunity to contribute towards automations to make the processing of each of these areas smoother while also getting some project experience.

What will you be doing?
  • AP & AR Inbox Management:
    Take full ownership of the AR inbox and support on managing the AP inbox, respond to queries within agreed SLAs
  • End to End Accounts Receivable:
    Own the accounts receivable cycle, including invoicing, collection, payment reconciliation and bad debt review.
  • Support Accounts Payable:
    Assist the team with processing invoices and payments, ensuring payables are managed closely.
  • Employee Expense Management:
    Own the expense management and corporate card spend processing, following up with users to ensure complete information is provided.
  • Bank Reconciliations:
    Ensure that banks are reconciled daily and queries are raised in a timely manner.
What experience might you have?

(But if you’re close… we’d still love to talk to you!)

  • Proven experience in a combined or standalone AR/AP role, with hands-on invoicing and cash application experience.
  • Strong attention to detail, with accuracy in data entry, reconciliation, and invoice processing.
  • Confident, professional communicator - comfortable managing client queries, chasing overdue balances, and escalating where appropriate.
  • Strong proficiency in Excel and with accounting softwares, ideally Net Suite.
  • Ability to manage a high-volume, varied workload and prioritise effectively to meet SLAs.
  • A collaborative, proactive team player who takes ownership of their work.
Can-be-learnts:
  • Experience with external billing engines, such as Stripe.
  • Stream business understanding.
What does success look like?

Within 1 month you’ll have:
  • Got comfortable navigating our systems and developed an understanding of our tech stack.
  • Learned how the invoicing process works for AR and how to address client queries.
  • Learned how to code and process the incoming bills.
Within 3 months you’ll have:
  • Mastered the AR invoicing cycle, having raised invoices, chased and reconciled payment.
  • Become confident with the processing of our supplier bills including understanding the matrix of approvals.
  • Made a noticeable reduction in the number of AP payment queries we have.
  • Be able to reconcile a number of our operational bank accounts.
Within 6 months you’ll have:
  • Made suggested possible improvements to our invoicing process.
  • Harnessed AI to help with volume of outbound emails and service requests.
  • Mastered the…
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