Mustapha Toyib

Apr 2023 – Present

Lagos, Nigeria · Full-time, hybrid

Software Engineer

Izifin Technologies

Flutter, React / Next.js, C# / ASP.NET, Docker, Redis, TDD

• •Owned the mobile application as the sole mobile engineer on the tech team, delivering features on sprint cycles and keeping the codebase extensible for new financial products through Clean Architecture and modular state management.
• •Moved onto the backend team, building and maintaining the services and API contracts behind the platform's financial features.
• •Worked with the web frontend team on the Risk Engine platform, a loan decisioning product for business lending, translating decisioning rules and data models into the web interface.
• •Held fixed-term contract engagements concurrently with this role, outside its hours.

Apr 2026 – Present

East Lansing, Michigan, USA · Remote, contract

Software Engineer (Mobile, Flutter)

CLIMDES Research Group

Flutter

• •Re-engaged by the research group on a six-month renewable term to continue development on the climate data platform.

Jan 2025 – Jun 2025

East Lansing, Michigan, USA · Remote, contract

Software Engineer (Mobile, Flutter)

CLIMDES Research Group

Flutter

• •Delivered a cross-platform climate data application for agricultural field decisions by working directly with a US-based research team to turn complex data models into usable interfaces.
• •Made the app usable in low-connectivity field conditions by implementing offline-first data sync and map-based features over REST APIs.

Feb 2021 – Oct 2025

Lagos, Nigeria · Fully remote

Software Engineer

Yalla Technologies

Flutter, React / Next.js, GraphQL

• •Yalla.ng, savings and investment (Feb 2021 – Jan 2024): launched the company's Islamic savings and investment product by building savings vaults, profit-sharing calculations, and onboarding flows across the Flutter mobile app and the React web frontend.
• •Maintenance (2024): kept the live savings product supported on a reduced, part-time basis through the company's transition year.
• •Yalla Ride, ride-hailing (Jan 2025 – Oct 2025): carried the codebase through the company's pivot from savings and investment to ride-hailing, building the new product on the existing mobile and web foundations.
• •Shipped both the customer and driver applications for Yalla Ride to production on iOS and Android.
• •Enabled live trip visibility for riders by developing real-time ride booking, driver matching, and trip tracking.
• •Gave drivers self-service operations by building trip request management, an earnings dashboard, and navigation integration.

Jan 2025 – Jun 2025

Remote · Contract

Software Engineer (Mobile, Flutter)

Bitnob

Flutter

• •Cut development time across the team by 25% by building a reusable UI component library adopted product-wide.
• •Supported cross-border payments, virtual cards, and digital asset transactions by engineering real-time wallet and transaction flows that held up under live load.