I'm Matthew Emmanuel, a full-stack mobile app developer building production-ready applications, backend systems and integrations for startups, businesses and product teams.
I'm a software developer focused on building mobile products and the backend systems behind them. My work spans fintech, AI, sports, real estate, logistics and marketplace products, with a focus on turning requirements into applications that can actually be shipped and used.
I build banking products at BellBank MFB, and work with product teams in the US and UK on contract — usually joining an app that is already live and taking it further.
Real mobile applications running in production on iOS and Android across fintech, AI, and logistics.
Nigeria's Central Bank digital currency app, letting people manage eNaira wallets, send peer-to-peer and bank transfers, and pay merchants.
A digital banking app for instant transfers, interbank payments, bill payments, fund requests and account management.
A cross-border payments platform for international transfers, virtual USD cards and virtual accounts, built for freelancers and businesses receiving money from abroad.
An AI negotiation coach that analyses contracts, offers, emails and conversations — identifying tactics, flagging risks and recommending responses.
Real-time baseball pitch tracking and performance analytics for athletes and coaches, with live session tracking and historical insights.
Browse all 16+ apps shipped across logistics, micro-pensions, food ordering, and marketplace platforms.
Explore All 16+ Shipped Apps →From user interface to database, I build complete applications ready for real users and scale.
iOS and Android apps built for real users, with attention to performance, maintainability and product experience.
Backend services and APIs that support mobile applications — business logic, authentication, data and integrations.
Connecting apps to REST APIs, Firebase and third-party platforms, from payment gateways to Gmail and Gemini APIs.
Registration, login and account management, including biometrics, two-factor authentication and KYC verification.
Transfers, bill payments, virtual cards, in-app purchases and subscription billing, wired to real payment providers.
Live tracking, transaction alerts and data synchronisation for apps where state has to stay current across devices.
Joining a live codebase to add features, fix bugs, improve performance and get releases out — most of my work starts here.
Taking an idea or spec to a functional mobile MVP that is ready for testing, the app stores and real users.
A mobile product is more than its interface. The backend, APIs, authentication, data, payments, integrations and application logic all have to work together.
I work across the mobile app and the backend systems required to support it, so the pieces are designed to fit together.
I build with real users, maintainability and deployment in mind — not a demo that works once.
I focus on understanding the actual product requirement and finding a practical way to implement it.
I communicate clearly with founders, designers, backend developers and product teams throughout development.
A production-proven technology stack across mobile clients, backend APIs, cloud architectures, and store deployments.
Transcribed verbatim from completed Upwork contracts across mobile product engineering and architecture.
"Working with Matthew is always a great experience. He was responsive, professional, and delivered high-quality work throughout the project. We completed a major redesign of my Flutter application, including a complex UI refresh, new analytics, Pitch Smart enhancements, and numerous bug fixes. Communication was excellent, deadlines were met, and the final product exceeded my expectations."
"Matthew did an outstanding job bringing the Negotix project to life. He demonstrated strong technical expertise, excellent communication, and a genuine commitment to delivering a high-quality product. Matthew successfully implemented complex features, paid close attention to detail, and remained flexible as requirements evolved."
"Matthew is consistently professional, reliable, and a pleasure to work with. He delivers high-quality work with exceptional attention to detail and demonstrates a deep understanding of both software development and technical architecture. He is among the strongest software developers and technical architects I have worked with."
"I'm extremely impressed with Matthew's work on our latest development project. His skill in migrating our email service to the Gmail API was evident, as the process was seamless. What truly stands out, however, is his integration of the Gemini API. The generative AI summaries are incredibly effective."
Listen to a verified client discuss their experience working with Matthew on Flutter application development, API integrations, and feature delivery.
Read all 24 Upwork Reviews ↗Whether you're starting from an idea, improving an existing application or looking for someone to take ownership of mobile development, let's talk about what you're building.