Kelvin Appiah

I design and build
production software
end-to-end.

Technical Lead & Product Architect

Kelvin Appiah

Self-taught, based in Kumasi, Ghana, in my final year of a Computer Science degree. Currently Technical Co-Founder & CEO at 404-Not-Null, leading engineering and product for two live platforms: Class-io and Groveh.

About & Operations

Self-Taught & Technical Progression

My engineering journey is self-taught, progressing from Vanilla HTML/CSS/JS and SASS to Dart, Flutter, TypeScript, Tailwind CSS, Next.js, and Expo. I handle production software end-to-end: system architecture, implementation, and operations.

I balance a full-time BSc Computer Science degree while architecting and running 404-Not-Null, keeping engineering focused on reliable execution and maintainable code.

404-Not-Null & Execution

As Technical Co-Founder and CEO at 404-Not-Null, I architect the core infrastructure across our product studio and drive the engineering execution.

We run on a strict, task-centric workflow: one owner, one output, one deadline. To support product launches on zero budget, I built an automated marketing engine that converts raw Git commits into scheduled social posts across platforms.

Selected Work

2024 — Present

Class-io UI Showcase
EdTech • Mobile & Web

Class-io

Students were spoofing GPS and screenshotting QR codes to skip class. Here is how I built a location-locked, rotating token system to actually verify attendance for 2,000+ users.

Read case study →
Groveh UI Showcase
Marketplace • Web & Mobile

Groveh

Chronological feeds punish established local vendors. I built a marketplace that ranks by actual quality and physical proximity instead of who posted last.

Read case study →

How I Work

I run engineering and leadership on the same rule: one owner, one output, one deadline, no exceptions.

I write code deliberately. I care about shipping production software, not managing inflated roadmaps.

Read more about how I work →

Technical Skills

Mobile & Web
FlutterNext.jsExpoReact
Backend & Data
SupabaseConvexH3 (Geospatial)Cloudflare (Workers, R2, Pages)
Auth & Infra
ClerkFirebase
Tooling
GitGitHub ActionsPostHogSentry

Background

Education

BSc Computer Science

University of Energy and Natural Resources

2023 — Present

BSc Computer Science, University of Energy and Natural Resources (UENR) — final year, final semester.

Mechanical Apprenticeship

Heavy Duty Mechanic Apprentice

D & H Heavy Duty Mechanics

Oct 2022 — Dec 2022

Maintained and inspected heavy machinery. Troubleshooting physical mechanical systems built the diagnostic discipline I apply to software debugging.

Awards & Leadership

Best Solar Project (1st Place)

STEM Novation Competition

Nov 2022

Served as Vice President of the Robotics Club. Built a solar tracking system with software monitoring that won 1st place nationally at the STEM Novation Competition.

Writing

August 31, 2026·7 min read

Vibe Coding Isn't the Problem. How You Vibe Code Is.

Autocomplete already moved coding from recall to recognition. AI moves it from recognition to generation. The blank editor test shows how much is left.

Read Article →
August 31, 2026·5 min read

Free First, Charge Later: Why the Habit Model Breaks at Scale

A realization, not yet a decision: habit is not evidence of value, and the paid tier has to be new value worth paying for before any habit exists.

Read Article →