Reimagining Business Finance
Reimagining Business Finance
A PCI-DSS compliant payment and treasury platform processing 50K+ daily transactions for a fast-growing business finance provider.
The Challenge
Our client, a fast-growing business finance provider, was outgrowing a legacy payments stack that could not keep pace with transaction volume or evolving compliance requirements. Settlement ran on overnight batch jobs, reconciliation was largely manual, and every new payment method meant weeks of custom work.
The cracks were starting to show to customers: delayed settlements, occasional double-processing during retries, and a support team fielding disputes that traced back to the platform rather than the users. Trust — the entire currency of a finance product — was on the line.
They needed a modern, PCI-DSS compliant platform that could process high transaction volume reliably, expose clean internal APIs, and stand up to financial-grade auditing. And it all had to happen without a maintenance window, on top of an active customer base moving real money every minute.
Our Solution
We designed an edge-routed transaction engine built around idempotent payment flows, so a retried or duplicated request could never move money twice. Automated reconciliation replaced the nightly batch job, matching ledger entries continuously and flagging anomalies in real time instead of the next morning.
Sensitive card data was isolated behind tokenization, keeping the core application entirely out of PCI scope and dramatically shrinking the audit surface. A hardened, append-only audit trail captured every state transition for full traceability.
Rather than a risky big-bang cutover, we ran a phased migration: shadow traffic first to validate parity, then a small percentage of live volume, scaling up only once throughput and settlement accuracy were proven at each step. The old and new systems ran side by side until the new engine had earned full trust.
Our Approach
- 1
Discovery & risk mapping
We mapped every payment path, failure mode, and compliance obligation before writing code, so the highest-risk flows were designed first.
- 2
Idempotent transaction core
Built the settlement and reconciliation engine with exactly-once guarantees and continuous ledger matching.
- 3
Tokenization & PCI scope reduction
Isolated cardholder data so the main application never touched it, minimizing the audit boundary.
- 4
Zero-downtime phased rollout
Migrated traffic incrementally with shadow testing and live canaries, validating accuracy at every stage.
Technologies Used
The Outcome
- A payments platform that scaled with the business instead of throttling it.
- Continuous reconciliation that eliminated the overnight batch window and its class of errors.
- A clean compliance posture that passed PCI-DSS audit on the first review.
“The team rebuilt our core payments architecture into a high-throughput engine that handled our peak volume without a single lag. Clean, production-ready code and true engineering partnership.”
A note on confidentiality: This project was delivered under a non-disclosure agreement. To respect our client's confidentiality, we've withheld their name and any identifying product details while describing the work, approach, and outcomes. We're happy to discuss relevant experience directly under NDA.
Figures shown are representative of the engagement and rounded to protect confidential details.