Software developer building offline-first apps and AI-powered tools for small businesses.
© 2026
Tools I use
Learning
Paul Ogirima John — Software Developer
SOFTWARE FOR SMALL BUSINESSES
I'm Paul, a software developer in Nigeria building offline-first web apps for small businesses, and growing into DevSecOps by adding automated security checks to my own projects.
Currently working on: two client apps in development, with demos delivered and launch in progress.
More about meMy Services
001
Web Development
Responsive web apps built with React, Next.js, and TanStack Start, styled with Tailwind CSS.
002
Backend Development
REST APIs with PostgreSQL, built with NestJS, Express, and FastAPI.
DevSecOps
Docker, CI/CD, and Gitleaks/Trivy scans on my own repos.
Also work with
Mobile Development
React Native, Expo, and Flutter.
AI Integration
LLM APIs and small workflow automation.
Selected Work
Biochemistry data-analysis tool
Early access — waitlist openTurns raw lab readings into standard curves, statistics, graphs and a written results paragraph — entirely in the browser, showing every step of the working. Early access via the waitlist.
Stack
Project Showcase
Offline bookkeeping for small business
Ojabook is an offline-first bookkeeping app for small traders and business owners. Record sales and expenses in seconds, always know who owes you, and let Ojabook add everything up for you — no account and no data connection required.
Problem
Small businesses still track money in paper notebooks — sales, expenses, and customer debts get lost, and nothing adds up at the end of the day.
Solution
Built an installable, offline-first web app that records every sale and expense, tracks customer debts, and totals sales, expenses, profit, and money owed automatically — saved right on the device.
Stack
Features
Security and CI
Runs on pull requests, pushes to main/master, and a weekly schedule: Gitleaks secret scan, Trivy filesystem and container scans, a bun dependency audit, and CodeQL analysis for JavaScript and TypeScript.
View the workflow file
Landing page
A clear promise, three core jobs, and an install prompt.
Home dashboard
Sales, expenses, profit, and debts — totalled at a glance.
Add a record
Capture a sale or expense in a few taps, even offline.
Project Showcase
Biochemistry data-analysis tool
Turns raw lab readings into standard curves, statistics, graphs and a written results paragraph — entirely in the browser, showing every step of the working.
Problem
Raw lab readings need to become a standard curve, statistics, a graph and a written results paragraph, with the working shown.
Solution
An in-browser tool that builds the standard curve, runs the statistics, draws the graph and writes the results paragraph, showing each step.
Stack
Features
Key technical decision
Run the standard-curve maths, statistics and graph drawing in the browser, so every step can be shown.
Limitations
Still an ongoing project, currently in early access.
What I'd improve next
Finish the ongoing build and move it out of early access.
Landing page
The standard curve and the promise to show every step.
Standard curve
Screenshot slot — not supplied yet.
Statistics
Screenshot slot — not supplied yet.
Graph
Screenshot slot — not supplied yet.
Written results
Screenshot slot — not supplied yet.
Step-by-step working
Screenshot slot — not supplied yet.
Project Showcase
AI image analysis platform
A multimodal AI image analysis platform that checks whether an image looks AI-generated, using NVIDIA Nemotron vision models in a TanStack Start app.
Problem
It is hard to tell whether an image was AI-generated, and people need a quick check without handing the image to a service that stores it.
Solution
Built an image upload flow that sends the image to an `/api/analyze` route, calls an NVIDIA Nemotron vision model, and returns an AI-generated percentage, reasoning, and confidence breakdown. Images are processed in memory and never stored.
Stack
Features
Key technical decision
Send each image through an `/api/analyze` server route to an NVIDIA Nemotron vision model, then show the AI-generated percentage, reasoning, and confidence breakdown in the analysis screen.
Limitations
Requires an NVIDIA API key; the README documents JPG, PNG and WebP uploads up to 5MB.
What I'd improve next
Add clearer error states for missing keys and failed model calls, and cover the `/api/analyze` route with tests.
Landing page
Entry point to the analysis tool.
Analysis screen
Where an input is submitted for analysis.
Analysis result
Where the result is displayed.
Architecture page
Screenshot slot — not supplied yet.
Documentation page
Screenshot slot — not supplied yet.
In Development
Biochemistry data-analysis tool
Turns raw lab readings into standard curves, statistics, graphs and a written results paragraph — entirely in the browser, showing every step of the working. Early access via the waitlist.
Real Estate & Construction Platform
The company website for Omze Homes & Properties Ltd — property listings, construction showcases, and a consultation flow. In development; demo delivered.
Restaurant & Cultural Dining Platform
A restaurant platform with menu and cart, table booking, and an admin dashboard. In development; demo delivered.
Notes & Productivity Mobile App
A cross-platform notes app with rich-text notes, reminders, and local-first storage. Personal project in progress.
Faith-Based Community App
A faith-based community app for wholesome social connection. Personal project in progress.
Development Process
Understand the problem
Talk through what you actually need before writing any code.
Plan scope and architecture
Agree on scope, milestones, and how the pieces fit together.
Design and build
Build in the open, sharing working demos along the way.
Test
Check functionality, performance, and security basics before launch.
Launch and iterate
Ship, then improve based on real feedback.
What I've Built
5
Demo projects built
Interactive demos across web and backend. None are live products yet.
2
Client projects in development
Omze Homes & Properties and De Diaspora — demos delivered, launch in progress.
Full-stack
Web and backend
I work across the stack, from interfaces and APIs to CI and security basics.
Offline-first
PWA built for low-data users
Ojabook records sales and expenses with no data connection.
Building practical web and mobile products with clean code.
Have a project in mind, a freelance opportunity, or just want to say hello? I'd love to hear from you.