Clarify a product idea
For an idea that needs a sharper problem, a clearer value proposition, or a sensible first version.
Discuss your ideaDesign engineer · Sierra Leone
From unclear ideasto useful digital products.
I’m Alhaji C.M. Kallon, a design engineer in Sierra Leone. I help founders, businesses and organisations discover the right problem, design a clear experience and build working digital products.
Discover → Define → Design → Build
Discover01 · Understand
Define02 · Decide
Design03 · Shape
Build04 · Deliver
What I do
Design engineering, from problem discovery to working software.
I work with founders, businesses and organisations to understand users, decide what to build, design accessible experiences and develop useful digital products. I’m based in Freetown, Sierra Leone.
Have an idea but no clear brief?
Start with the problem, the people affected and the assumptions worth testing before building.
Discuss an ideaWant to see how I work?
Explore case studies showing context, decisions, implementation and the limits of the evidence.
Read case studiesLooking for a specific answer? Read frequently asked questions about services, process and project experience.
How I work
From the right question. To a product people can use.
I work across the decisions that shape a product: what problem matters, what the first version needs to do, how people will use it, and how to build it reliably.
Problem discovery
Understand the people, context, and current workarounds before deciding what deserves to be solved.
Product thinking
Turn a broad idea into a clearer value proposition, surface risky assumptions, and define a useful first version.
Experience design
Shape the information, flows, and interfaces around what people need to understand and do.
Engineering
Build and improve the product with attention to usability, performance, reliability, and the constraints the team actually has.
The path so far
2020
01
Choosing a direction
After exploring Civil Engineering and Computer Science, I chose to pursue the field that best matched my interest in how systems work and how ideas become real.
2022
02
Building foundations
Started a Computer Science programme at Central University Sierra Leone and helped fellow students work through projects and core concepts.
2024
03
A different learning path
Financial pressure and personal decisions led me to leave university and continue learning independently through focused study and practical work.
2026
04
Building for real use
Focused on taking projects from early ideas through product decisions, design, implementation, and practical use.
Selected workWORK
WORK
IN CONTEXT
These case studies show the problem, the decisions I made, what I built, and what the available evidence can—and cannot—tell us.
Explore all workGiving AEEM's work a clearer place to be found and understood
Product thinking, UX, content design & web development
Giving AEEM's work a clearer place to be found and understood
How I helped a youth-led education organisation bring its story, documented activities, and ways to get involved into one working digital experience.
Web designContent architectureFrontend development
Building the backend foundation for MJ Studio
Backend engineering · In progress
Building the backend foundation for MJ Studio
Engineering a photography-studio backend with a structured domain model, studio-aware permissions, transactional data operations, and automated API and migration checks.
Node.jsTypeScriptExpressSupabasePostgreSQLVitestSupertest
Writing & InsightsTHOUGHT
All Articles THOUGHT
LEADERSHIP
Writing will appear here when ready
Only authored and reviewed journal entries are featured. The library currently has no published articles.
alhaji@kallon:~$ cat ./professional_philosophy.md
>"A product does not earn its place because it exists. It earns it by solving a problem people care about—and by showing that it does."
— Alhaji C M Kallon, Design Engineer
$question --decide --build --learn
Start where you are
What are you working through?
Whether you have an early idea, want to see how I work, or are here to learn, start with the path that fits.
Explore the work
Explore the problem, decisions, and implementation behind real projects.
Read the case studiesRead the thinking
Read practical notes on product thinking, technology, and how useful digital products get made.
Explore the writingNotes from the workTHINK CLEARLY.
THINK CLEARLY.
BUILD USEFULLY.
Notes on product decisions, technology, and building digital products—written to make the reasoning behind the work more useful and reusable.
Read the notes