I design and build digital products from the first working flow to a production-ready release. My work covers the interface, backend, third-party integrations, deployment, and the details that keep real users from getting stuck.
| Product engineering Turn an idea into a clear user flow, responsive interface, working application, and maintainable codebase. | Payments and integrations Connect payment providers, wallets, identity systems, callbacks, webhooks, and external APIs safely. |
| Backend and data Design APIs, authentication, database models, permissions, validation, and operational admin tools. | Launch and reliability Prepare applications for deployment, mobile use, failure recovery, monitoring, and continued iteration. |
- Frontend: TypeScript, JavaScript, React, Next.js, HTML, CSS
- Backend: Node.js, Express, PostgreSQL, Supabase
- Integrations: World ID, MiniKit, M-Pesa Daraja, Pi SDK, REST APIs
- Delivery: Git, GitHub, Vercel, testing, deployment, technical documentation
- World Mini Apps and identity-aware products
- Mobile-money, wallet, and payment integrations
- Full-stack MVPs and product rebuilds
- API development and production hardening
Josiah / jontAWorldjontaworld@gmail.com

