DAVID O. HAROLD

Based in Nigeria (GMT+1)

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FULLSTACK
DEVELOPER

SELECTED
WORKS

A curated collection of digital products, agent systems, and reliable platforms built for scale.

Oct 2024 — Oct 2025

BanffPay Limited

Fullstack Developer

Designed and built an agent onboarding system for seamless and efficient processing.
Built a compliance platform that automated the collection and management of partner information.
Developed frontend applications using React, TypeScript, and modern UI frameworks.
Implemented backend services and APIs using Node.js, Express, and PostgreSQL.
Optimized application performance, security, and scalability.

BanffPay Limited

Jan 2023 — Present

SimpooBusiness

Frontend Developer (Web, Mobile & Desktop)

Developed and maintained an inventory management system across web, mobile, and desktop platforms.
Built a fully offline-capable desktop app using Electron.js.
Created a responsive web application and an intuitive mobile app with React and React Native.
Stack: React, Electron.js, React Native, PostgreSQL, Redux, Tailwind.

SimpooBusiness

Nov 2023 — Oct 2024

Cosmoremit

Frontend Web / Mobile Developer

Worked with designers to improve product usability and ensure brand consistency.
Carried out periodic UI updates and bug fixes for web and mobile apps.
Stack: React, React Native, TypeScript, Redux, GitHub, Jira.

Cosmoremit

Sep 2023 — Mar 2024

UseDora

Frontend Developer

Collaborated on visually appealing interfaces and API integration.
Provided technical expertise during project planning and execution.
Stack: Next.js, TypeScript, Postman, Tailwind, GitHub.

UseDora