Four case studies, each written the same way: the problem, what was built, my role, the hard parts and the measurable outcome. Every figure comes from production data or the codebase and carries its date.
One of them, the platform of a medical laboratory network, is a confidential engagement: I describe the architecture and aggregated numbers only, with no screenshots or source code.
Entertainment & event platform
In productionEvent platform for French-speaking Africa: paid-vote competitions with a live public leaderboard, QR ticketing delivered on WhatsApp and organizer payouts, all paid by Mobile Money. Designed, built and operated by one engineer, live since March 2026 with verifiable early traction.
Immigration guidance · consumer web app
LiveA bilingual web app that tells Cameroonians their real odds of moving abroad before they pay an intermediary for the answer: an adaptive questionnaire, a deterministic scoring engine covering 10 countries, and a paid report delivered as a PDF or on WhatsApp.
Confidential engagementHealthcare platform — multi-site laboratory network
In production (rolling out site by site)A platform for a network of eight medical laboratories that were each running an isolated copy of a legacy application, covering four distinct systems built by one engineer: the public website, a site-synchronisation layer, a commercial and accounting steering tool, and a lab-operations service now piloted at one site.
PropTech marketplace
Live (early stage)A furnished-rental discovery platform for Cameroon where the details that matter (access video, neighbourhood hotspots) are unlocked with tokens bought through Mobile Money. Designed, built and deployed by one person: a modular NestJS/GraphQL API, a Next.js front end, MongoDB transactions and a Traefik topology where nothing but the proxy is exposed.
Smaller products, client deliveries, open-source tooling and advisory work — most of it built in 2026 around Mobile Money payments and business workflows.
Healthcare · internal business application
Internal application for a medical centre in Yaoundé covering the patient journey from reception to lab results, invoicing and daily cash reports, with role-based access, an audit log and five printable A4 documents. Delivered as a Docker Compose package with PostgreSQL: 16 Prisma models and a GraphQL API with 26 queries and 29 mutations.
Non-profit · bilingual website with donations
Bilingual FR/EN website for a health foundation in Cameroon reporting 12,000+ direct beneficiaries, 9 campaigns in 2025 and 40+ volunteers, with a donation flow (Mobile Money or card) handled entirely server-side, contact and newsletter forms with anti-spam and rate limiting, and complete SEO metadata. Live on Vercel since July 2026; donations currently run in the payment provider's test mode.
E-commerce · Mobile Money checkout
Online shop in French, English and Japanese where stock reservation and order creation happen in a single database transaction, prices are recomputed server-side and the Mobile Money payment is confirmed by an idempotent webhook that releases stock on failure. Includes an admin back-office for products, categories and orders; deployed as a public demo.
Sales landing page · digital products
Sales page for "PIB Eto'o — Autopsie d'une Puissance Soft-Power" (PIBE, a play on "Produit Intérieur Brut" — Eto'o's own GDP), a book on Samuel Eto'o's economic value to Cameroon, plus a companion 6-track album, with a multi-step payment flow supporting MTN MoMo, Orange Money, Express Union and bank transfer through Nokash. Payment errors are categorized with user-facing advice and retry rules; the source code is public on GitHub.
Real estate · luxury property marketplace
A marketplace for Cameroon's luxury property market: rent, buy or sell across seven categories (villas, duplexes, furnished studios, apartments, hotels), with a searchable listing filterable by rent-or-sale, address, property type and price range, and a dedicated page per property with a full photo gallery. Reports 50+ listed properties, 3+ owners and managers, and 20+ organisations served.
Open source · developer tooling
make-nestjs-faf is a command-line scaffolder for NestJS APIs: JWT authentication with roles, PostgreSQL or MongoDB via Prisma, REST or GraphQL, Docker, GitHub Actions and Jest preconfigured. It sits alongside NestJS authentication boilerplates from 2024; all are available on GitHub and not published on npm.
Product & technical advisory
A product and pricing strategy memo for MedVAULT SARL, a company operating a health platform, covering delivery automation, multi-tenant architecture and the pricing model. Earlier in 2026, a digital-commerce system proposal for GPG Trade Network, an import and distribution business in Cameroon and the CEMAC region.