Customer story
Written by

Pasha Golestaneh
Published on
July 16, 2025
Company
Bumper
ERP
Netsuite
80%
Balance Sheet Accounts Reconciled in Stacks Within the First Month
90%
Journal Entries Powered by Stacks' Excel Assistant
How Bumper Is Upleveling Close & Controls with Stacks
Bumper, the UK’s leading automotive payment platform, is scaling fast across markets, entities, and currencies. For Alfie Sansom, Finance Director at Bumper, that scale requires finance to be structured, efficient, and always ready - because in his words:
“Finance should never be the blocker for the next company milestone or funding round. We should be the enabler.”
Using his strong audit and finance background, Alfie had a clear vision: empower Bumper’s already high-performing finance team with better tools and processes, giving them the foundation to keep pace with the company’s rapid growth. That vision led to a partnership with Stacks.
Building the Foundation for Close Excellence
There was an opportunity to bring more structure to Bumper’s month-end close and balance sheet reconciliation process. Alfie saw the potential to streamline workflows, increase visibility, and ensure that nothing critical was left behind.
With support from the Stacks team, Bumper implemented a collaborative workspace that aligned material balance sheet accounts, assigned clear owners, and established due dates and review protocols - all within the Stacks workspace.
Alfie S, Finance Director, highlights:
“Stacks helped us bring real visibility to our reconciliations. We now have a shared understanding across the team - what’s in scope, who’s responsible, and when it’s due. People are notified as soon as something is ready or a balance changes”
Within the first month, over 80% of in-scope accounts were reconciled in Stacks, with adoption increasing each month. Every reconciliation includes clear audit evidence - preparer, reviewer, documentation, and timestamp - giving the team peace of mind ahead of their next external audit.
Alfie S, Finance Director, emphasizes:
“This year’s audit is going to be a breeze. Everything’s tracked and documented, and there’s a clear review history for every account.”

Making Journals Effortless
Beyond account reconciliations, the Bumper team quickly embraced other Stacks tools, especially the Excel Assistant for journal entries and pulling reports.. Most journals at Bumper are now posted through structured Excel templates, eliminating the need for error-prone CSV uploads every month.
Ed D, Senior Management Accountant, points out:
“Stacks has completely changed how we post journals. What used to take hours with CSVs every close now takes minutes with the Excel Assistant.”
The Results
Area | Impact |
Reconciliations | 80%+ of balance sheet accounts reconciled in Stacks within the first month |
Audit Readiness | Fully documented workspace with preparer/reviewer history for each task and reconciliation |
Journal Entries | 90% of journals now posted via Excel Assistant; CSVs largely deprecated |
Close Management | Month-end checklist fully visible and owned within Stacks |
With Stacks, Bumper’s finance team has gained not just visibility, but confidence. They’re equipped with a system that scales with the business and a partner that supports their growth journey.
Alfie S, Finance Director, mentions:
“Stacks help us stay ahead, stay organized, and stay in control - without needing to grow the team.”
Bumper and Stacks are combining automation with innovation to build a future-ready finance function. One that fuels growth, drives efficiency, and supports smarter decision-making.