I'm a passionate developer specializing in building modern, responsive, and user-friendly web applications. Welcome to my personal space on the internet where ideas come to life.
As a senior mobile engineer with 5+ years of expertise in Flutter and Android, I build high-performance, responsive applications that deliver exceptional user experiences. My development process is accelerated by cutting-edge AI tools like Cursor and Gemini, enabling me to deliver robust, high-quality code with greater speed and efficiency.
I excel at translating complex design prototypes into pixel-perfect applications. Whether working independently or collaboratively, I am committed to building scalable, maintainable solutions that drive results.
Featured Projects
A selection of my recent work, showcasing my skills and creativity.
Gamma Time - True Stories
As a Flutter Developer on the Gamma Time team, I was instrumental in building core functionalities for the app. My contributions include implementing an infinite video scrolling feed, robust user authentication, seamless in-app purchases, and integrating rewarded ad monetization.
As a key contributor to the Letshego team, I played a vital role in developing their fintech app, which provides various loan services. Initially, I worked with the MSE squad to deliver a product facilitating loans for qualified customers. Subsequently, I transitioned to the BAU team, where I was responsible for resolving production issues and ensuring the app's stability.
As part of the WAKI project, I worked as a Flutter Developer focusing on delivering key features for canteen and attendance management. I worked on integrating QR code scanning to enable seamless payments and attendance tracking, and implemented functionality for managing and switching between multiple user accounts within the app. I also collaborated on integrating Firebase services and utilized ML Kit for smart scanning features, while ensuring smooth Bluetooth connectivity where required. My work helped deliver a reliable, secure, and user-friendly mobile experience for organizations and users managing daily operations.
As a Flutter Developer on the Stereopark project, I worked on building essential app features. I developed a custom audio player for seamless playback, implemented a real-time chat system using GetStream, and ensured secure user authentication. Together, these contributions helped create a smooth and engaging experience for users.
Flutter
GetStream
Firebase
Matematyka Gryzie
As a Flutter Developer on the Matematyka Gryzie project, I worked on delivering key features for the web learning platform. I contributed to building interactive course modules, optimizing video lessons and task handling for smooth performance, and ensuring a responsive, user-friendly interface across devices. I also collaborated with the team on implementing secure authentication, payment integrations, and scalable features that supported thousands of students. My work helped provide a reliable and engaging web experience for learners preparing for exams.
As part of the Involved Community App project, I worked as a Flutter Developer on building and maintaining features that connect local Christian communities. I restructured core parts of the source code to significantly enhance the app’s performance and reliability. On a daily basis, I contributed by integrating new API endpoints, implementing user-facing screens, reviewing code, fixing bugs, and keeping dependencies up to date. I also took ownership of release activities, ensuring smooth deployments to both app stores at the end of each sprint. My contributions helped deliver a stable, scalable, and engaging platform for communities to stay connected and engaged
A breakdown of my technical capabilities and the tools I use.
Mobile
Flutter (Dart)
Android (Kotlin/Java)
Backend & BaaS
Firebase
Supabase
AI-Powered Development
Cursor
Gemini
Monetization
RevenueCat (Subscriptions & IAPs)
Stripe
Feature Integration
Get-Stream (Chat Systems)
Map APIs
GraphQL
Websockets
Admin Panels
Flutter
React
DevOps & Cloud
Azure DevOps
AWS
DataDog
Sentry
OpenAI
What Clients Say
Feedback from people I've had the pleasure to work with.
"Yonatan is an all-around great developer. Good communication, fast work, quality code. Highly recommended. We have already referred him to other organizations where he has also done great work."
John Steele
Involved
"Great work ethic and delivery of quality work; good teamwork."
Michael Inambao
Letshego Holdings
Get In Touch
Have a project in mind? I'd love to hear from you.