Gigson

At Devcenter, I rebuilt Gigson’s React recruitment application through launch and continued developing it during the original engagement ending February 2026. The January–February modernization focused on how authentication, sessions, and billing shared state, alongside a toolchain upgrade.

The application had to distinguish a restored session from a loaded user profile and handle expired sessions consistently.

I separated session primitives in Zustand from the server-owned user profile in TanStack Query. Authentication distinguished a guest, a session still resolving, and a loaded user. An unauthorized response reset application state through the same cleanup path used by logout.

Subscription changes needed to refresh both billing history and the current user’s subscription data.

I centralized query keys and defined cache updates and invalidation rules for billing mutations. I also limited which queries could persist locally and trimmed large arrays during serialization to keep the stored cache from growing unchecked.

I added 63 tests across authentication, billing, and sessions, plus lint, type, and test checks in CI.

Asset conversion, code splitting, and lazy loading reduced raw production build output from 3.13 MB to 2.07 MB (34%) in the January–February comparison.