Vector Pay's legacy dashboard was built on a十年前 stack — slow, unresponsive on mobile, and unable to handle the volume of real-time transactions their growing client base demanded. Internal teams spent 40% of sprint time on maintenance, leaving little room for the product features their users were requesting.
We embedded a two-person team (frontend + backend) directly with Vector Pay's product squad. Over two weeks of discovery, we mapped every user flow, identified the 12 most-used screens, and built a component library in TanStack Start that would serve as the foundation for the rebuild. We shipped working builds every Friday, with the product team testing in production alongside the legacy system.
The new dashboard processes 3× the transaction volume at half the latency, works fully offline-capable via service workers, and cuts maintenance overhead by 60%. The component library is now used across four internal products. The migration happened with zero downtime — the legacy and new systems ran in parallel until every user was transitioned.
“ISL embedded with our product team in a week. By month two we'd shipped what our internal roadmap had blocked for a year.”
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