Senior Mobile & Full-Stack Engineer
Crafting mobile apps
& the systems behind them.
Hi, I'm Ajibola Akinmosin. I build cross-platform mobile apps with Flutter and Dart, and the secure, scalable backends behind them in C# and TypeScript.
- Focus
- Mobile engineering
- Mobile
- Flutter · Dart
- Backend
- C# · NestJS
- Based
- Lagos, Nigeria
01 / About
Mobile first, full-stack throughout.
I'm a mobile and full-stack engineer with 5+ years of experience building fintech, payments and secure communication products, currently shipping mobile at Busha and Yousend.
My focus is mobile client engineering: cross-platform Flutter apps built on clean architecture, predictable BLoC/Cubit state management, and features that feel native on iOS and Android. On the server side I build secure, scalable services in C# (ASP.NET Core) and TypeScript (NestJS).
I studied Computer Science at Federal University Lokoja, where coursework in algorithms, machine learning and cryptography laid the groundwork for the work I enjoy most: end-to-end encrypted messaging and compliant, high-volume payment systems.
02 / Skills
The toolkit.
From the widget tree to the database: the tools I reach for to ship and scale.
Mobile
- Flutter & Dart
- State Management (BLoC/Cubit)
- Clean Architecture & Dependency Injection
- iOS & Android Platform Integrations
- Biometric Auth & KYC Flows
Backend & APIs
- C# / ASP.NET Core
- TypeScript / NestJS
- REST APIs
- MQTT Real-Time Messaging
- JWT / SSO Authentication
Databases & Cloud
- PostgreSQL, MongoDB, MySQL
- Cassandra
- AWS & Google Cloud
- Docker & Linux
- Git
03 / Projects
Selected work.
Products I've designed, built and shipped across fintech, payments and secure messaging, plus open source.
- 01 · Open source · Flutter plugin
screenshot_shield
A Flutter plugin for protecting sensitive screens: it detects screenshots and screen recordings, blanks captures of a whole screen or a single region, and hides the app in the app switcher.
Highlights
- 01Published on pub.dev, with native implementations for Android, iOS, Windows and Linux
- 02Built on Android 14/15 screen-capture and recording APIs and iOS per-scene capture state
- 03Keeps a single region out of iOS recordings with a live, capture-excluded copy
- 04Route-aware guards that count their claims, plus app-switcher privacy
- Flutter
- Dart
- Kotlin
- Swift
- C++
- 02 · Yousend Inc.
Cross-Border Payments App
Fast, reliable money transfers across currencies on iOS and Android, built so several payment teams can ship in parallel.
Highlights
- 01Real-time currency conversion and cross-border flows with a 99.9% success rate
- 02Payment processing latency down 25% through optimised state management
- 03Mono-repo with clean architecture layers, cutting code duplication by 30%
- 04Crash rates down 20%; 85% test coverage on critical payment paths
- Flutter
- Dart
- BLoC/Cubit
- Clean Architecture
- 03 · Presence Inc.
End-to-End Encrypted Messenger
Private real-time chat, calls and media sharing where only the people in the conversation can read it.
Highlights
- 01End-to-end encryption with the Signal Protocol and RSA
- 02MQTT message relaying that cut messaging latency by 70%
- 03Encrypted audio/video calling and secure image/video transfer
- Flutter
- Dart
- Signal Protocol
- MQTT
- 04 · Centiiv
Fintech Remittance Platform
Sending money at scale, for individuals and businesses, across borders and in line with financial regulations.
Highlights
- 01Built end to end: Flutter client and NestJS backend
- 02Backend services scaled for secure, high-volume transactions
- 03B2B bulk transfers, corporate payments and real-time FX rate handling
- Flutter
- Dart
- NestJS
- TypeScript
- 05 · Opus Technology
Enterprise SSO & Search
Secure sign-on and faster data retrieval for internal applications used across a large employee base.
Highlights
- 01SSO middleware with JWT validation and payload extraction
- 02Redirect logic optimised to cut latency by 1,500 ms
- 0310+ critical React UI issues fixed, halving user-reported bugs
- C#
- ASP.NET Core
- React
- JWT
04 / Experience
Where I've worked.
Aug 2025 – Present
Mobile Engineer
Busha
Building and maintaining core Flutter features for crypto and financial transactions, with scalable UI components and robust API workflows across iOS and Android.
Aug 2025 – Present
Senior Software Developer
Yousend Inc.
Architected a clean-architecture mono-repo for 3+ payment teams and shipped cross-border flows with a 99.9% success rate, 40% faster feature delivery and 20% fewer crashes.
May 2024 – Mar 2025
Software Engineer
Opus Technology
Built secure SSO middleware in .NET Core, improved enterprise search, cut redirect latency by 1,500 ms and halved user-reported React UI bugs.
Mar 2022 – Mar 2024
Lead Software Engineer
Presence Inc.
Led a Flutter end-to-end encrypted messenger with Signal Protocol, encrypted calls and media, and MQTT relaying that cut latency by 70%.
Oct 2020 – Feb 2022
Lead Engineer
Centiiv
Built a fintech remittance platform end to end in Flutter and NestJS, extending it to B2B bulk payments and cross-border transfers with real-time FX.
05 / Blog
Latest writing.
Notes on mobile, backend and the craft of shipping software, published on Medium.
New articles are on the way.
Follow me on Medium ↗06 / Contact
Let's build something together.
Have a mobile product, backend system or collaboration in mind? Book a call or send me an email.