SaaS / HR Tech
Rebuilding a Legacy SaaS Platform Without a Single Day of Downtime
A phased rebuild of a decade-old SaaS platform onto a modern, type-safe architecture, migrating active customers with zero downtime.
0hours of customer-facing downtime
76%reduction in median page load time
8 monthsfull migration timeline
The Problem
A decade of feature additions had left the platform's codebase brittle, with page load times over eight seconds and a growing backlog of bugs the original team couldn't safely fix.
The Solution
We ran a phased migration: new features were built on a modern Next.js and typed API architecture behind a feature-flagged router, letting customers move over gradually rather than a risky big-bang cutover.
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