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Jonald Penpillo, a software developer in the Philippines, builds payment flows with money rules strict enough for an e-money operator: his Delightful Village wallet runs on an append-only double-entry ledger with atomic purchases and anti-money-laundering checks.
Proof, not promises
A closed-loop wallet and marketplace for bazaars: shoppers pay stalls by QR, on an append-only double-entry ledger in integer centavos, with atomic purchases, signed idempotent cash-in callbacks and inline anti-money-laundering checks. Customer app, merchant app and web console on one typed API.
Stack: Expo, React Native, React, TypeScript, Express, Supabase, PayMongo
Booking and payments platform for a 30-bay golf driving range, pickleball courts and a kids playground, with a five-step booking flow, live bay availability and PayMongo checkout. Range AI answers guests on the website and Facebook Messenger and takes them from a question to a paid booking; accuracy on real guest messages rose from 55% to 71%.
Stack: React 19, TypeScript, Express 5, Supabase, PayMongo, Python, scikit-learn, Gemini, Messenger API
A phone-first app for transport, guide and accommodation suppliers: today’s trips, an on-trip safety card with SOS and live location, services and availability, and payouts after commission.
Stack: Expo, React Native, TypeScript, Express 5, Supabase, PayMongo
Jonald Penpillo is a software developer and AI engineer in General Santos City, Philippines, and Software Development Supervisor at Brigada Group, where he leads a team of six developers. He has shipped 15 projects, including three production AI systems in 2026, and received the Innovation Award at Top Executive Congress 2025. He works remotely with clients worldwide. Résumé · All projects · LinkedIn · GitHub
Yes. Jonald is based in General Santos City, Philippines, and works remotely with clients worldwide, in English, Filipino or Cebuano.
Yes. Every project ends with documentation, deployment and monitoring set up, and a handover session, so your team can run, change and extend the system.
Send a short description of the system you need through the project form at https://www.penpillo-jonald.online/?view=deploy or email jonaldpenpillo@gmail.com. Jonald replies with questions about your workflow, then a proposed scope and plan.