Brief
A B2B SaaS company selling to professional services firms needed to rebuild their core project management product from a slow, outdated codebase into a modern, scalable platform while continuing to serve their existing customer base without downtime.
Background
The client had built their first version of the product using a freelance team several years earlier. The codebase had grown fragmented, deployments were unpredictable, and adding new features had become painful and slow. Customers were beginning to churn to newer competitors with faster, cleaner interfaces. The client needed a rebuild that preserved all existing functionality, migrated live data cleanly, and introduced a new UI that would help them compete. They could not afford to shut the product down during the transition.
Challenges
Running a rebuild alongside a live product serving paying customers required a dual-track strategy. We maintained and patched the old system while progressively building the new one in parallel. Data migration had to be surgical, moving client records, project histories, billing data, and user permissions without a single record lost. The new architecture also had to support a multi-tenant model with role-based access that the original system handled poorly.
Outcome
The full rebuild was completed in twelve weeks with zero production downtime. Customer data was migrated in a single weekend window with no reported data issues. Monthly churn dropped from 8 percent to under 2 percent in the three months following the relaunch. The client's sales team reported that the new product UI became a primary selling point in demos. The rebuilt platform also reduced infrastructure costs by 40 percent due to more efficient cloud resource usage.
Technology
- React
- TypeScript
- Node.js
- PostgreSQL
- Redis
- AWS ECS
- GitHub Actions
- Prisma
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