Systems built to hold
I design and build web, mobile and backend systems that turn ideas into reliable digital products.
- Years of experience
- 7+
- Projects delivered
- 15+
- Live in production
- 8
- Node.js
- React
- Next.js
- TypeScript
- Flutter
- MongoDB
- Docker
- NGINX
- PHP
- Firebase
How I build
Three convictions that shape every system I ship.
Backend that holds
One API contract, one place for business rules, and a data model designed before the first line of code.
Mobile that ships
Android and iOS from a single Flutter codebase, connected to the same backend as the web.
Delivery I own
I deploy on servers I provision and maintain, so shipping does not depend on someone else's calendar.
Systems running in production
Every project below was built, deployed and — in most cases — is still maintained by me.
Engineering built to last
Architecture, delivery and hosting handled by the same person — which is why the systems I ship are still running.
10 technologies in production
The domain is modelled before the first line of code — a habit kept from a management-computing degree.
6
Backend, mobile and web tied together by a single API contract, so business rules live in one place.
3
Available for projects
I deploy on Nginx and Ubuntu servers I provision and maintain myself. Shipping never waits on someone else's calendar, and neither does fixing.
2
distinctions at ISTAG
From problem to production
The same six steps, whether the deliverable is an API, a mobile app or a full ecosystem.
Framing
Understanding the real problem before proposing a system.
Modelling
Data model and domain rules, drawn before any code exists.
Architecture
Deciding what is shared, what is separated, and why.
Build
Implementation, one working slice at a time.
Deploy
Provisioning, deployment and the monitoring that follows.
Maintain
Staying responsible for the system after launch.
What I work with
Technologies I have shipped production code in — not a list of everything I have read about.
Backend
Where I do my deepest work: API design, data modelling and the rules that hold a product together.
- Node.js
- Express.js
- REST APIs
- PHP
- MongoDB
- MySQL
- SQLite
Frontend
Interfaces built to be indexed, fast and maintainable by the people who own them.
- React
- Next.js
- TypeScript
- Vite
- HTML5
- CSS
- Tailwind CSS
- Bootstrap
- Material UI
Mobile
Cross-platform applications shipped to both Android and iOS from one codebase.
- Flutter
- Dart
- React Native
Infrastructure & DevOps
I deploy and operate the servers my applications run on, rather than handing that off.
- Nginx
- Ubuntu
- Docker
- Linux
- CI/CD
- GitHub
- Firebase
- Supabase
Engineering practice
Formal modelling before code — a habit from a management-computing degree, kept because it works.
- UML
- MERISE
- OOP
- PowerAMC
- DbMain
- StarUML
Languages
The languages I have shipped production code in.
- JavaScript
- TypeScript
- Dart
- PHP
- C#
- Java
- Visual Basic
Questions I am often asked
Availability, ways of working, and what I do best.
Yes. I am part-time at Colisgo and co-founder of AfreeLink, which leaves room for freelance work — as it did for the NumRise projects delivered in 2025 and 2026.
I am based in Yaoundé, Cameroon, and I work remotely. Patrimony Life Financial was delivered for the Canadian market from here.
Backend architecture and the systems around it: APIs serving several clients at once, mobile applications connected to them, and the deployment that follows.
Yes. Several of the projects I deliver run on Nginx and Ubuntu servers that I provision and maintain myself.
French and English, both fluently.
Let's build something reliable
Tell me about the system you need. I read every message.
Email
jeffreychoguen@colisgo.org
Location
Yaoundé, Cameroon · remote
Languages
French · English