Emmanuel is available for hire
Hire EmmanuelEmmanuel Ogie
Verified Expert in Engineering
Software Developer
Toronto, ON, Canada
Toptal member since September 15, 2025
Bio
Emmanuel is a product-centric software developer with 5+ years of experience building scalable web and mobile apps in proptech and fintech using React and React Native. He has delivered 5+ apps with over five million active users, including work at Flutterwave, where he doubled the user base and improved merchant retention, serving enterprise clients like Microsoft and Booking.com. Skilled in building high-performance apps, Emmanuel thrives in Agile teams and drives measurable business impact.
Portfolio
Flutterwave
React Native, React, TypeScript, JavaScript, Testing, Agile, Enterprise...
Anthony Curreri
JavaScript, iOS, Node.js, Capacitor, React, Responsive Layout...
RedNine Inc. d/b/a Rebolt
React Native, Expo, Next.js, Ownership, Clerk, Google API, Jest
Experience
- JavaScript - 6 years
- Communication - 6 years
- React - 6 years
- React Native - 6 years
- Expo - 6 years
- Testing - 5 years
- TypeScript - 4 years
- Firebase - 4 years
Preferred Environment
React, React Native, Fintech, Android, iOS, API Integration, User Experience (UX), Mobile App Development, Front-end Development, Full-stack Development
The most amazing...
...thing I've built is a mobile app that powers payments for 5+ million users, enabling 200+ million transactions annually and driving $20+ billion in revenue.
Work Experience
React Native Mobile Engineer
2023 - PRESENT
Flutterwave
- Headed the development of new products, creating innovative features, and ensuring the ongoing maintenance of the web and mobile codebase.
- Architected, developed, and maintained F4B for Uber, Microsoft, Booking.com, and others, enabling merchants worldwide to accept customer payments and resulting in a transaction volume of 200+ million.
- Identified and resolved bugs within the codebase by writing tests using Jest and the React JavaScript library.
- Authored comprehensive technical documentation for fellow developers to integrate this feature seamlessly.
- Collaborated with UI/UX designers to translate design mock-ups and wireframes into high-quality, interactive user interfaces.
- Stayed informed of industry trends, emerging technologies, and front-end development best practices in React Native, applying this expertise to enhance and optimize team projects using Kotlin.
Technologies: React Native, React, TypeScript, JavaScript, Testing, Agile, Enterprise, Communication, CSS, iOS, Node.js, API Integration, Android, HTML, REST APIs, Scalability, Query Optimization, Performance Optimization, CI/CD Pipelines, UI Testing, Mobile UI, Mobile, User Experience (UX), Slack, Agile Project Management, Architecture, Startups, User Interface (UI), Google Play Store, App Store, Mobile Apps, Firebase Authentication, Messaging, Mobile App Development, GitHub Actions, ESLint, HTML5, RESTFul APIs, OpenAI, Hybrid Apps, Mobile Applications, Stripe, Code Review, Unit Testing, HTTP REST, Kotlin, Swift, Design Patterns, Front-end Development, Mobile Development, App Development, Debugging, Expo.io, SDKs, SwiftUI, Caching, React Navigation, React Hooks, Offline Data Synchronization, Application State Management, Asynchronous Programming, Android App Development, iOS App Development, Security, Office 365 API, Web App Development, Figma, Gmail API, Audit Testing, Digital Payments, Maintenance, Bug Fixes, SaaS, Front-end, AI Integration, Ownership, Responsive Layout, Native Mobile Apps, Technical Leadership, App Design, Jest, Swagger
Full-stack Mobile Application Developer
2026 - 2026
Anthony Curreri
- Led the development and deployment strategy for a startup platform built with React, React Native, and Supabase, successfully delivering responsive web and mobile applications while preparing and launching the iOS application to the Apple App Store.
- Optimized back-end workflows, database interactions, and security protocols using Supabase, including authentication, API integrations, and database migration support outside low-code environments to improve scalability and maintainability.
- Enhanced UI/UX across mobile devices and desktop browsers by building responsive, user-friendly interfaces with React, while collaborating directly with founders and stakeholders to communicate technical solutions in clear, business-focused terms.
Technologies: JavaScript, iOS, Node.js, Capacitor, React, Responsive Layout, AI-generated Code, AI Tools, Mobile Apps, Stripe, React Native, Jest, PostgreSQL
React Native Developer
2026 - 2026
RedNine Inc. d/b/a Rebolt
- Developed and maintained scalable CRM mobile applications using React Native for both iOS and Android platforms, delivering responsive and high-performance user experiences for thousands of users.
- Implemented OTA updates using Expo EAS alongside CI/CD pipelines with GitHub Actions, and introduced AI-powered code review workflows, improving release efficiency and reducing deployment time to the app stores by over 40%.
- Integrated monitoring and analytics tools such as Sentry and FullStory to track crashes, monitor app performance, capture user sessions, and improve overall application stability and user experience.
- Collaborated closely with product managers, designers, and back-end engineers to build features such as scheduling, notifications, task management, API integrations, and real-time data synchronization within agile development environments.
Technologies: React Native, Expo, Next.js, Ownership, Clerk, Google API, Jest
Front-end Mobile and Web Developer
2020 - 2023
Octo5 Holdings
- Led the architecture and design of the OE Manager mobile application, developing reusable components and a design system for the product.
- Integrated and consumed ERP Next APIs to streamline and enhance accounting processes.
- Oversaw and offered mentorship to interns and junior engineers, meticulously reviewed pull requests, and fostered close collaboration with product, project, and design teams to devise impactful implementation strategies for feature reviews.
- Headed the development team in revamping and enhancing the performance of both the mobile and web apps, resulting in a notable 10% increase in revenue.
- Integrated Firebase for push notifications, analytics, and crash analysis, identifying and resolving bugs within the codebase.
- Implemented comprehensive testing frameworks, including React Testing Library, Jest, and Cypress for both unit and end-to-end testing environments.
- Participated in Agile development, contributing to sprint planning, stand-ups, and retrospectives to achieve team goals.
- Oversaw the deployment of a mobile application to both iOS and Android stores. Optimized deployment process using Microsoft Code push.
Technologies: React Native, React, Next.js, TypeScript, Firebase, Expo, Remote Team Leadership, JavaScript, Testing, Agile, Communication, iOS, Node.js, API Integration, APIs, Android, HTML, GraphQL, REST APIs, Scalability, Query Optimization, Performance Optimization, CI/CD Pipelines, UI Testing, Mobile UI, Mobile, User Experience (UX), GitHub, Agile Project Management, Leadership, Architecture, Web Development, Real Estate, Full-stack, Multiple Listing Services (MLS), User Interface (UI), Google Play Store, App Store, Mobile Apps, Firebase Authentication, Messaging, Mobile App Development, SendBird, ESLint, HTML5, RESTFul APIs, Hybrid Apps, Mobile Applications, Code Review, Unit Testing, HTTP REST, Kotlin, Swift, Design Patterns, Front-end Development, Mobile Development, App Development, Debugging, Expo.io, Payment APIs, Caching, React Navigation, React Hooks, Offline Data Synchronization, Application State Management, Asynchronous Programming, Android App Development, iOS App Development, Security, Office 365 API, Web App Development, Figma, Gmail API, Audit Testing, Digital Payments, Full-stack Development, Instant Messaging, Maintenance, React Query, Workflow, Bug Fixes, Pre-launch, Vite, Front-end, Back-end, Ownership, Responsive Layout, Native Mobile Apps, Technical Leadership, App Design, Jest, Swagger, Material UI
Front-end Web Developer
2019 - 2020
West Africa Virus Epidemiology
- Collaborated with other programmers to develop and maintain web applications for conducting research surveys.
- Designed and implemented a dashboard for the company to efficiently monitor customer activities.
- Identified and resolved software issues using debugging techniques, resulting in a 10% decrease in website downtime.
- Collaborated with cross-functional teams to understand project requirements and contribute to designing and implementing user interfaces for payment and onboarding processes.
- Participated in Agile development, contributing to sprint planning, stand-ups, and retrospectives to achieve team goals.
Technologies: React, JavaScript, Redux, GitLab, A/B Testing, Testing, CSS, Bootstrap, API Integration, REST APIs, Performance Optimization, User Experience (UX), GitHub, Web Development, User Interface (UI), HTML5, RESTFul APIs, Code Review, HTTP REST, Data Source Types, Debugging, Vercel, Application State Management, Asynchronous Programming, Security, Office 365 API, Web App Development, Excel Add-ins, Figma, Audit Testing, Maintenance, Bug Fixes, Front-end, Responsive Layout, Material UI
Experience
Flutterwave4Business
https://apps.apple.com/ca/app/flutterwave/id1534897339The Flutterwave F4B mobile app is a financial platform that enables businesses and merchants to seamlessly collect payments and manage their online presence. It powers global transactions for over five million active users.
I worked across the collections and store teams. On collections, I developed merchant checkout features that allowed businesses to securely accept payments. On the store team, I built functionality for merchants to create online stores, upload products, and generate shareable purchase links that automatically collect payments.
My contributions included integrating RESTful APIs, implementing CI/CD pipelines, and managing deployments to the App Store and Google Play Store. I also collaborated closely with QA teams to debug and resolve issues, ensuring a reliable and high-quality experience.
The impact was significant: merchants could scale their businesses globally with secure, easy-to-use tools, and the app achieved over 95% merchant retention. My work directly improved adoption, streamlined payment flows, and strengthened Flutterwave’s position as a leading fintech platform.
I worked across the collections and store teams. On collections, I developed merchant checkout features that allowed businesses to securely accept payments. On the store team, I built functionality for merchants to create online stores, upload products, and generate shareable purchase links that automatically collect payments.
My contributions included integrating RESTful APIs, implementing CI/CD pipelines, and managing deployments to the App Store and Google Play Store. I also collaborated closely with QA teams to debug and resolve issues, ensuring a reliable and high-quality experience.
The impact was significant: merchants could scale their businesses globally with secure, easy-to-use tools, and the app achieved over 95% merchant retention. My work directly improved adoption, streamlined payment flows, and strengthened Flutterwave’s position as a leading fintech platform.
SaveToOwn
https://apps.apple.com/ng/app/stow/id1525639962SavetoOwn is a real estate investment and property purchase mobile app built in React Native. It was designed to solve the challenge of affordable home ownership by enabling customers to purchase properties through flexible installment payments.
The users can track payment schedules, receive push/email reminders, and complete transactions seamlessly. It also introduced a group ownership feature, where multiple users could co-invest in a property, rent it out, and share ROI, opening new pathways for property investment.
I led the revamp of the application, overseeing end-to-end development and deployment. Key contributions included building installment tracking and reminder systems, implementing group co-investment features, and integrating Firebase Crashlytics and Bugsnag to proactively detect and fix crashes. I also implemented webhooks for payments and subscription billing, ensuring secure, real-time updates for customer transactions.
The impact was significant: stability improvements boosted customer retention to over 98%, while reliable subscription handling and new features increased adoption and engagement. SavetoOwn strengthened Octo5’s mission of making home ownership more accessible and attractive to a wider audience.
The users can track payment schedules, receive push/email reminders, and complete transactions seamlessly. It also introduced a group ownership feature, where multiple users could co-invest in a property, rent it out, and share ROI, opening new pathways for property investment.
I led the revamp of the application, overseeing end-to-end development and deployment. Key contributions included building installment tracking and reminder systems, implementing group co-investment features, and integrating Firebase Crashlytics and Bugsnag to proactively detect and fix crashes. I also implemented webhooks for payments and subscription billing, ensuring secure, real-time updates for customer transactions.
The impact was significant: stability improvements boosted customer retention to over 98%, while reliable subscription handling and new features increased adoption and engagement. SavetoOwn strengthened Octo5’s mission of making home ownership more accessible and attractive to a wider audience.
OE Manager
https://apps.apple.com/ng/app/oe-manager/id1604058712OEManager is a real estate management app developed for Octo5 Holdings to streamline estate operations and enhance resident experience. The app enables users to pay utility bills, manage dependents, generate visitor passes, and handle other property-related tasks. As the sole React Native developer on the project, I led the end-to-end development, implementation, and deployment of the app, designing the architecture, integrating APIs, and building core features for payment processing, visitor management, and resident services. I also integrated the app with ERPNext to manage accounting and financial workflows seamlessly. My work improved estate security, simplified daily tasks for residents, and replaced manual processes with automated, reliable workflows. The outcome was a 100% adoption rate across the estate households, higher resident satisfaction, and a modernized property management experience, positioning Octo5 as a technology-forward real estate company.
Zojapay Admin Dashboard
ZojaPay Admin Dashboard is an administrative platform for a financial services company, designed to streamline operations, user management, and customer support. It allows admin users to monitor user activities, manage customer KYC levels, and efficiently handle inquiries through a ticketing system.
Built for a financial services company, it addressed challenges related to manual user tracking, slow customer inquiry resolution, and limited visibility into compliance processes. The target users are the admin and operations teams, who manage platform users and ensure regulatory compliance.
I architected, developed, and maintained the dashboard using React and TypeScript, collaborating with design, product, and project teams to translate requirements into a robust, user-friendly system. Key contributions included building the ticketing system, monitoring user activity, and developing KYC modules to manage customer verification levels.
The impact was significant: admin workflows became more efficient, KYC tracking became more accurate, and customer inquiries were resolved faster. The outcome was a more organized, compliant, and responsive administrative process, enhancing operational efficiency and platform reliability.
Built for a financial services company, it addressed challenges related to manual user tracking, slow customer inquiry resolution, and limited visibility into compliance processes. The target users are the admin and operations teams, who manage platform users and ensure regulatory compliance.
I architected, developed, and maintained the dashboard using React and TypeScript, collaborating with design, product, and project teams to translate requirements into a robust, user-friendly system. Key contributions included building the ticketing system, monitoring user activity, and developing KYC modules to manage customer verification levels.
The impact was significant: admin workflows became more efficient, KYC tracking became more accurate, and customer inquiries were resolved faster. The outcome was a more organized, compliant, and responsive administrative process, enhancing operational efficiency and platform reliability.
Youverify Agent
YouCheck is a cross-platform mobile application designed to streamline address verification tasks for field agents. The app allows agents to capture, verify, and submit address data efficiently, even in areas with limited or no internet connectivity, thanks to its offline-first capabilities.
Built for YouVerify, it solved challenges related to delayed verification and unreliable connectivity, improving operational efficiency. The target users are field agents and verification officers, and the app successfully onboarded companies such as Bolt, enabling them to verify drivers quickly and reliably.
As the lead developer, I architected, developed, and implemented the app using React Native, integrating RESTful APIs with JSON payloads, WebSocket for real-time messaging, and SQLite for local data storage. I collaborated with product and design teams to translate requirements into a robust, user-friendly application.
The impact was significant: agents could perform verifications faster, reducing errors and improving productivity. The outcome was a more efficient verification workflow, higher agent satisfaction, and measurable operational improvements for YouVerify and its clients.
Built for YouVerify, it solved challenges related to delayed verification and unreliable connectivity, improving operational efficiency. The target users are field agents and verification officers, and the app successfully onboarded companies such as Bolt, enabling them to verify drivers quickly and reliably.
As the lead developer, I architected, developed, and implemented the app using React Native, integrating RESTful APIs with JSON payloads, WebSocket for real-time messaging, and SQLite for local data storage. I collaborated with product and design teams to translate requirements into a robust, user-friendly application.
The impact was significant: agents could perform verifications faster, reducing errors and improving productivity. The outcome was a more efficient verification workflow, higher agent satisfaction, and measurable operational improvements for YouVerify and its clients.
React Native Developer
I led the mobile development and deployment stabilization of a healthcare application built with React Native, Expo, and TypeScript, designed exclusively for iPads. The project focused on bug fixes, improving deployment reliability and enhancing front-end quality across approximately 18 screens. I standardized the build and deployment process to ensure stable, reproducible releases while refactoring components to improve maintainability, type safety, and UI consistency. Working directly with the client in a milestone-driven environment, I delivered reliable iPad deployments and strengthened overall confidence in the application’s front-end stability
Full-stack Mobile Engineer
Led the development of a mobile MVP for a universal predictive engine designed to deliver complex analyses such as betting predictions, with future expansion into financial insights and health forecasting. Using React Native, I built a cross-platform application that translated predictive data into clear, user-friendly interfaces while establishing a scalable front-end architecture. Throughout the project, I collaborated closely with the client to shape the MVP’s scope and align the product with subscription features using Stripe. The result is a functional MVP that validated the betting use case and laid a strong foundation for future growth across multiple predictive domains.
Point of Sale Web Platform
https://warhousesales.com/productsI developed a scalable point-of-sale web platform using Next.js, Tailwind, and Supabase, enabling secure and real-time transaction processing. I integrated Stripe S700 payment terminals to support seamless in-store payments. I also implemented security best practices and managed deployment pipelines. This solution was successfully rolled out across four cities in the United States.
React Native App for Forecasting
A cross-platform React Native application that integrates AI-based predictive analytics to deliver intelligent, personalized sports forecasts. By learning from each user’s behaviors and preferences, the app provides tailored recommendations designed to enhance strategy, increase confidence, and optimize the overall user experience.
Education
2023 - 2024
Graduate Certificate in Project Management
Humber College - Toronto, Canada
2013 - 2017
Bachelor's Degree in Microbiology
Covenant University - Ota, Nigeria
Skills
Libraries/APIs
React, React Navigation, Office 365 API, Gmail API, REST APIs, SendBird, Google Maps API, Stripe, Google Maps, React Query, Google APIs, Google API, Node.js, Stripe API, Claude API
Tools
Expo, GitHub, Crashlytics, Firebase Authentication, Expo.io, Claude Code, Claude, GitLab, Slack, Multiple Listing Services (MLS), Figma, Capacitor
Languages
JavaScript, TypeScript, CSS, HTML, HTML5, GraphQL, CSS3, Kotlin, Swift
Frameworks
React Native, Redux, Jest, Next.js, Swagger, Material UI, Bootstrap, Tailwind CSS, SwiftUI
Paradigms
Agile Project Management, Unit Testing, Mobile Development, App Development, Responsive Layout, Agile, Testing, Design Patterns, Asynchronous Programming, Role-based Access Control (RBAC)
Platforms
Firebase, Mobile, iOS, Android, Vercel, Clerk
Storage
Google Cloud, Data Source Types, SQLite, PostgreSQL
Other
Communication, API Integration, Scalability, Performance Optimization, Fintech, Proptech, User Experience (UX), Mobile UI, UI Testing, Architecture, Web Development, Minimum Viable Product (MVP), Real Estate, Startups, User Interface (UI), Google Play Store, App Store, Mobile Apps, Mobile App Development, ESLint, Hybrid Apps, Mobile Applications, Code Review, HTTP REST, Front-end Development, Debugging, Payment APIs, Caching, Push Notifications, React Hooks, Application State Management, Web App Development, Digital Payments, Maintenance, Bug Fixes, Pre-launch, SaaS, Front-end, Ownership, App Design, AI Agents, Remote Team Leadership, Enterprise, Leadership, IT Project Management, Query Optimization, Deployment, CI/CD Pipelines, RESTFul APIs, OpenAI, SDKs, QR Codes, Offline Data Synchronization, WebSockets, Android App Development, iOS App Development, Security, Excel Add-ins, Quality Assurance (QA), Audit Testing, Instant Messaging, Workflow, Vite, AI Integration, AI Tools, AI-generated Code, Native Mobile Apps, Supabase, Technical Leadership, AI-assisted Development, Scrum Master, A/B Testing, APIs, ERPNext, Full-stack, Messaging, GitHub Actions, Local Networking, iPad, Artificial Intelligence (AI), Full-stack Development, Lovable, superbase, Back-end, Large Language Models (LLMs), Real-time Data
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