Open to opportunities

Oluwaseun Adeyeri

@oluwaseunadeyeri

Message

I build high-performance web and mobile fintech applications with Next.js, React, and React Native.

Nigeria

Message

What I'm looking for

I'm looking to build high-performance web and cross-platform mobile products, especially secure fintech experiences, while collaborating closely with product, design, and backend teams.

At Bellfast, I architect and optimize production React Native/Expo features, improving rendering speeds and load times by 15%. I also integrate secure RESTful APIs, offline-first capabilities, financial transactions, and Firebase real-time notifications.

Previously at Nebula, I built responsive Next.js interfaces from complex Figma prototypes, increased test coverage by 25%, and modularized legacy React components to improve development velocity by 30%.

I've also launched cross-platform mobile apps and web tools at SQI College of ICT, with a focus on performance, accessible design-to-code execution, secure fintech integrations, and reliable automated testing.

Experience

Work history, roles, and key accomplishments

Current

Frontend and Mobile Developer

Current

Bellfast

Apr 2025 - Present (1 year 4 months)

Architected and optimized key features for a production React Native/Expo application, achieving a 15% improvement in rendering speeds and load times. Collaborated with backend engineers to design and integrate secure, scalable RESTful APIs, and led the end-to-end integration of real-time notifications using Firebase.