Open to opportunities

Demilade Ologuntoye

@demiladeologuntoye

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Senior software engineer specializing in React, React Native, and scalable web/mobile systems for fintech products.

Nigeria

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What I'm looking for

I’m looking for a team where I can lead high-quality React/React Native product development, own scalable architecture (APIs, performance, testing), and mentor engineers while shipping fintech-grade user experiences.

I’m a results-driven Senior Software Engineer focused on building modern, maintainable web and cross-platform mobile experiences. I specialize in React, React Native, and Next.js, and I’m passionate about turning complex requirements into reliable, user-centric products that perform in production.

In my current role, I lead cross-platform mobile development with React Native alongside web solutions powered by Next.js. I architect and integrate REST and GraphQL APIs, enforce testing and code-quality standards, and drive performance improvements through caching and targeted code optimizations—so teams ship faster and users feel the difference.

Previously, at Peerless (Sterling Bank), I led key modules within SeaBaaS, a next-generation core banking platform. I implemented a micro-frontend architecture to enable modular, independently deployable UI components, contributed to microservices and cloud-native integrations, and integrated open APIs and AI-driven analytics to support smarter, data-driven banking decisions.

I’ve also delivered high-impact features across fintech and enterprise projects, including the FGN Treasury Portal and the Maestro digital account opening and payment flow. From building responsive interfaces with React and Sass/SCSS to integrating APIs using Swagger and Postman, I consistently improve reliability with unit testing, strengthen maintainability through refactoring, and boost performance through profiling and caching.

Experience

Work history, roles, and key accomplishments

Current

Lead Frontend Developer

Current

Technology Citadels Solution

Mar 2025 - Present (1 year 3 months)

Led development of cross-platform mobile apps with React Native and web solutions using Next.js. Architected REST and GraphQL integrations, enforced testing/code quality standards, and optimized performance with caching to improve responsiveness and load times.

React Native Next.js REST APIs GraphQL Cross Platform Development Performance Optimization Caching Testing Code Quality

Senior Frontend Engineer

Peerless (Sterling Bank)

Mar 2024 - Apr 2025 (1 year 1 month)

Led key modules for SeaBaaS, a core banking platform, by implementing a micro-frontend architecture and building responsive user interfaces with React. Strengthened quality with unit testing, supported cloud-native microservices integrations, and enabled smarter decisions via open APIs and AI-driven analytics.

React Microservices Unit Testing APIs

Senior Software Engineer

Simplify International Synergy Ltd

Mar 2023 - Mar 2024 (1 year)

Developed secure revenue-payment capabilities for the FGN Treasury Portal using React Native and React. Built and optimized high-performance modules across Maestro and Monibag, improving application performance by 30–40% through caching strategies and profiling, while raising reliability via unit testing and code reviews.

React Native React SASS Caching Strategies Performance Profiling Unit Testing Code Review Agile Delivery API Integration

Software Engineer

System Specs

May 2022 - Apr 2023 (11 months)

Designed and maintained cross-platform mobile applications with React Native and supported responsive web pages using React and SCSS. Integrated APIs using Swagger/Postman, implemented CI/CD with CodeMagic, refactored the codebase for maintainability, and improved reliability with unit testing and QA collaboration.

React Native React SCSS API Integration Swagger Postman CI CD Codemagic Unit Testing Refactoring

Full Stack Developer

Freelance

Jan 2020 - May 2022 (2 years 4 months)

Independently designed and built Android and iOS mobile applications with React Native and delivered client websites using React, PHP, and Node.js. Managed projects using Jira and Asana, supported marketing-related activities to drive client acquisition, and maintained client satisfaction through clear communication and regular updates.

React Native React PHP Node Jira Asana Client Communication Mobile App Development

Information Technology Intern

NASD PLC

Aug 2019 - Dec 2019 (4 months)

Contributed to an internal dashboard for tracking business initiatives and operational income using PHP. Implemented a Mandate Web portal with HTML/CSS/JavaScript/MySQL/PHP to automate customer record management and signature verification, and supported quality through unit testing and defect resolution.

PHP MySQL HTML CSS JavaScript Unit Testing Documentation Web Portals