Case study · Marketplace
Hamro Sajha Bazaar
A national multi-category marketplace, secondhand goods, vehicles, jobs, medical, trades, rentals, agriculture, food and beauty, with verified sellers, escrow protection and Nepali/English UI.
9categories
eSewa · Khaltipayments
NE · ENlanguages
freelistings
The problem
Classifieds without the scams.
Nepali classifieds are fragmented across Facebook groups with no verification, no payment protection and no recourse. Buyers cannot tell a real seller from a fake listing, and sellers cannot prove they are real.
The product needed the breadth of a classifieds site with the trust mechanics of a marketplace: identity checks, a protected payment path, moderation and a dispute trail.
What we built
Nine categories, one trust layer.
- Category-specific listing models (goods, vehicles, jobs, rentals, services, food) with their own fields and validation.
- Seller verification: phone OTP plus ID review, with a visible verification state on listings.
- Search and filters per category, featured listings, saved searches and a Nepali/English interface.
- Escrow checkout with eSewa and Khalti, order states, refunds and a buyer-protection dispute flow.
- Admin console for KYC review, listing moderation, category taxonomy and payment reconciliation.
Architecture
How it is put together
Next.js frontend (app router, BFF route handlers)
│ HTTPS
▼
NestJS API (REST, JWT + sessions, RBAC)
│ │ │
PostgreSQL payment callbacks object storage
(Prisma) eSewa / Khalti (listing media)
│
SMS/OTP · admin console · moderation queue
Stack
Next.jsReactNestJSPostgreSQLPrismaNextAutheSewaKhaltiSparrow SMSTailwind
Security and money
- Registration can only assign buyer/seller roles; admin and reviewer roles are granted server-side after review.
- Payment confirmation happens only after a server-to-server verification with the provider.
- Uploaded media is content-validated by magic bytes and re-encoded before it is served.
- Auth, OTP and search endpoints are rate-limited, and pagination is bounded.
Screens
Product surfaces
Similar work
Building something in this category?
We can walk you through the architecture, the payment integration and the failure cases on a call, including the parts that were hard.