A sample of what we do. Most of it is under NDA, so these are described by shape rather than by client.
A reservation flow that lost customers at payment. Rebuilt in nine weeks, with the old path kept live until the new one was proven.
Replaced a spreadsheet that four teams depended on. The hard part was the migration, not the tool.
Six weeks on failure modes only. No new features shipped, and that was the point.
A component library small enough that people actually used it instead of routing around it.