Backend for a multi-merchant e-commerce marketplace, built and led as co-founder and lead backend engineer.

Shipped 30+ REST API endpoints on a TypeScript/Express backend over MongoDB, defining the data model and API contracts from scratch for a multi-merchant marketplace.

Improved backend efficiency by 20% through caching, a schema redesign, and query restructuring across a data model with concurrent write workloads.

Integrated M-Pesa payments and Firebase Cloud Messaging notifications, and led code reviews for intern developers.

Kikapu App — Multi-Merchant Marketplace