A full stack developer & digital entrepreneur building premium digital products.

I'm Collen Sengwenyane - a full stack software developer and digital entrepreneur based in Pretoria, South Africa. From frontend and backend to native Android, I help businesses bring ideas to life through modern, scalable products that solve real problems.

Work with me See recent work

Collen Sengwenyane - freelance web and Android developer in Pretoria

Building digital products from Pretoria to the world.

I started Coding with CS to ship tools I actually wanted to use - and to help South African businesses compete online with the same polish as global brands. Today I build marketing websites, native Android apps, and everything in between for clients who need one developer they can trust from first sketch to Play Store launch.

My foundation in Digital Entrepreneurship from IT Varsity shapes how I work - combining full stack engineering with product and business thinking. I don't just write code; I think about market fit, user experience, and growing digital businesses. That mindset drives everything from client projects to my own apps on Google Play, including Avelix PDF.

See my work Coding with CS on Play Store

Six principles I bring to every project.

These are the things clients tell me they value most about working together.

Clean code

Readable, tested, well-architected code your team can build on.

Modern UI/UX

Interfaces that look premium and feel intuitive on every device.

Performance

Optimized for Core Web Vitals, fast loads, and smooth animations.

Scalable

Architected to grow from your first user to your millionth.

Client-focused

Clear communication, on-time delivery and a long-term partnership.

Web & Mobile

One developer covering both sides - saving you time and money.

Tools I use to build fast, scalable products.

A modern stack chosen for performance, developer experience, and long-term maintainability.

Frontend

4 tools

React

Next.js

Tailwind CSS

TypeScript

Backend

4 tools

Node.js

Firebase

MongoDB

PostgreSQL

Mobile

4 tools

Android Studio

Kotlin

Java

Jetpack Compose

Ready to build something great?

Tell me about your idea and I'll send back a clear plan, timeline and quote within 24 hours.

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