Overview
What it is
Chekka ("Before you buy — Chekka") is a professional car inspection and verification service. A buyer books an inspection; a professional verifies the vehicle; the buyer gets a report they can trust before handing over money.
The architecture
It's a Next.js 16 monolith over Mongoose + Redis + S3, in TypeScript, tested with Playwright — a direct descendant of the Managerenta reference architecture (Model → Service → Route). The product is backed by a large (~37k-word) specification, so the build follows a written contract rather than ad-hoc scope.
Highlights
The domain is trust: the whole value proposition is that an independent, professional inspection de-risks a high-value used-car purchase. That puts the weight on report integrity, media handling (S3), and a booking flow that schedules real humans.