01 / 2026
Accessible education
ADT Studio
Turns textbooks and PDFs into accessible digital books that are easier to read, search, and learn from.
Digital publishing · Accessibility↗
Software developer · Dar es Salaam, Tanzania
I build tools that make learning easier.
I'm Johnson Mmbaga. I make accessible learning software, digital publishing tools, and practical products that help people get things done.
My focussoftware with a clear purpose
Johnson · Dar es Salaam
Software, with a human point of view
Featured work01 / 06
Accessible education
ADT Studio
Turns textbooks and PDFs into accessible digital books that are easier to read, search, and learn from.
See the projectWhat I do
I make complex ideas
useful to people.
I'm an independent software developer from Dar es Salaam, Tanzania. I work across product design and engineering, turning an early idea into software people can understand and use.
Right now, I'm focused on accessible education: converting learning materials into better digital formats, making learning more interactive, and building the tools that support it.
Accessible learningDigital publishingProduct engineeringFull-stack web
Selected projects · 2025—2026
Things I've made.
02 / 2026
Astrology progressive web app
Asteria
An astrology companion for exploring birth charts, planetary placements, and personal cosmic patterns.
Next.js · Progressive web app↗
03 / 2026
Learning · Offline first
ChessQuest
A visual chess-learning app that teaches through lessons and practice, including when you’re offline.
Chess learning · Offline first↗
04 / 2025
Accessible publishing
Litera
A publishing toolkit for creating accessible Swahili learning materials for students and teachers.
Education · Publishing↗
05 / 2025
Developer tools
Easymail
An SMTP email API that lets product teams send mail from multiple organizations through one service.
Email · Developer tools↗
06 / 2025
Engineering standards
devcanon
A developer tool that gives teams a consistent starting point for project standards and engineering rules.
Open source · Developer tools↗
Experiences & milestones
The lines that
got me here.
A few chapters in a journey that keeps unfolding.
- 2026
Making learning more accessible
Building ADT Studio and a textbook publishing pipeline, alongside Asteria and Easymail.
ADT Studio · Asteria · Easymail - 2025—2026
Learning, publishing, and tools for teams
Exploring new ways to learn and publish through ChessQuest and Litera, while building tools for software teams.
ChessQuest · Litera · devcanon - 2023—2024
Shipping useful products
Started building full-stack products for students, teams, and local businesses.
Winga · JokaFlix · SmartSales · PrepView
Have a good idea?