Ahmed is available for hire
Hire AhmedAhmed Harmouche
Verified Expert in Engineering
Mobile Developer
Pécs, Hungary
Toptal member since February 1, 2022
Bio
Ahmed is a full-stack engineer with seven years of experience building applications for the photo and video editor apps and medical industry. He worked on award-winning Android applications with hundreds of thousands of monthly active users and has experience with the whole Firebase stack. Besides full-stack development, Ahmed enjoys low-level Android programming and graphics programming using Android NDK and OpenGL ES.
Portfolio
Mobile Action Inc.
Reverse Engineering, Android SDK, Decompilation, Python, Cryptography, Mobile...
Habbly Ltd.
React Native, JavaScript, FlutterFlow, Mobile Apps, Expo, Replit, React...
Freelance
iOS, Kotlin, Android, Expo, Swift, React Native, App Clips, WebSockets, React...
Experience
- Android - 10 years
- Android SDK - 7 years
- JavaScript - 7 years
- Kotlin - 7 years
- Node.js - 5 years
- Firebase - 5 years
- Python - 4 years
- Android NDK - 2 years
Preferred Environment
MacOS, Git, Visual Studio Code (VS Code), Android Studio
The most amazing...
...thing I've developed is a multi-award winning photo editor application that has more than 10 million downloads.
Work Experience
Android Reverse Engineer
2025 - 2025
Mobile Action Inc.
- Reverse engineered a data encoding and decoding algorithm from an Android SDK.
- Decompiled and analyzed the highly obfuscated Java code and low-level smali code to find target functions.
- From the obfuscated decompiled output, I recovered the encoding and decoding functionality and hand-ported it to Python.
- Tested and validated the ported encoder and decoder Python script against various test inputs to ensure robustness.
- Identified and handled decompiler errors, including a misdecompiled method that reads along from a ByteBuffer at a given position.
Technologies: Reverse Engineering, Android SDK, Decompilation, Python, Cryptography, Mobile, Mobile Applications, APIs, Libraries, Push Notifications, Design, Vibe Coding, Software Development Toolkits (SDK), Application Architecture, Model View ViewModel (MVVM), Performance Optimization, Security, User Permissions
React Native Developer
2025 - 2025
Habbly Ltd.
- Prototyped a novel language learning app featuring a TikTok-style video feed.
- Consulted with the client and proposed the tech stack for the app.
- Wrote a prototype in Expo using the Replit sketch the client already had.
- Improved the Replit prototype using the AI agent and also modified the React code the agent generated.
Technologies: React Native, JavaScript, FlutterFlow, Mobile Apps, Expo, Replit, React, WebSockets, REST APIs, Mobile, Mobile Applications, Hybrid Apps, Push Notifications, App Development, React Native for Web, TypeScript, Design, Front-end Development, Cursor AI, Vibe Coding, PostgreSQL, Application Architecture, User Permissions
Polyglot Mobile (Android & iOS) Engineer
2025 - 2025
Freelance
- Forked and customized Expo Go for a client who got into Y Combinator. The fork development included both JavaScript and Native-side changes (Objective-C and Swift).
- Refactored the Expo Go fork to run in App Clip (the 1st ever App Clip to allow JavaScript side-loading).
- Rewrote the React Native Core WebSocket native module to use my custom NSURLSession-based WebSocket library instead of SocketRocket.
- Modified the Expo CLI tooling used in Expo Go to deploy to our own EAS and the App Store.
- Developed every aspect of the fork and made it go from initial build to approval in the App Store.
- Wrote back-end functions using Convex for CodeSandbox health checks and to start idle VMs before user apps are loaded.
- Used WidgetKit to create widgets that display user-created apps, with widget handling available on the native bridge for JavaScript interaction.
Technologies: iOS, Kotlin, Android, Expo, Swift, React Native, App Clips, WebSockets, React, REST APIs, Convex, Mobile, Mobile Applications, Hybrid Apps, APIs, SDKs, Libraries, Artificial Intelligence (AI), Push Notifications, Full-stack Development, Webhooks, Redux, Large Language Models (LLMs), App Development, React Native for Web, TypeScript, Design, Front-end Development, Cursor AI, Vibe Coding, iOS App Development, Software Development Toolkits (SDK), Application Architecture, Model View ViewModel (MVVM), Performance Optimization, SwiftUI, User Permissions
Android Reverse Engineer
2025 - 2025
MobileAction
- Reverse-engineered a custom Base64 encoding used in a mobile SDK.
- Leveraged JADX to decompile an APK and find the character mapping used for Base64 obfuscation.
- Conducted a combination of speculative reversing and brute force o reverse engineer another mapping used on the iOS part of the SDK.
Technologies: Android, Reverse Engineering, Android SDK, Kotlin, Cryptography, Mobile Apps, REST APIs, Mobile, Mobile Applications, APIs, SDKs, Push Notifications, Design, Vibe Coding, Software Development Toolkits (SDK), Application Architecture, Performance Optimization, Security, User Permissions
Python and C++ Developer
2025 - 2025
Arcadia Impact, CIC
- Evaluated LLM chip design capabilities using the inspect ai Python framework.
- Worked with the OpenAI API and used GPT-4o as an agent to perform chip component design in Verilog.
- Wrote test benches in C++ using Verilator to validate Verilog modules.
- Used Yosys to check the synthesizability of the generated Verilog modules.
Technologies: Python, C++, Docker, Large Language Models (LLMs), Kubernetes, Linux, Unix, Verilog, REST APIs, APIs, SDKs, Libraries, Artificial Intelligence (AI), Cursor AI, Vibe Coding, Application Architecture, User Permissions
iOS, Swift, and SwiftUI Developer
2024 - 2024
Ghost Notes Inc.
- Developed and ported audio-visual fragment shaders from GLSL to Metal Shading Language (MSL).
- Refactored the video effects/filters so that they have user-modifiable parameters.
- Worked on improving our video effects' performance to hit our target of 30 FPS.
Technologies: iOS, ARKit, Swift, SwiftUI, Agile, AWS HA, Objective-C++, Objective-C, Android, Mobile Apps, REST APIs, Machine Vision, Mobile, Mobile Applications, Hybrid Apps, APIs, SDKs, Push Notifications, Full-stack Development, Webhooks, App Development, Design, Front-end Development, iOS App Development, Software Development Toolkits (SDK), Application Architecture, Model View ViewModel (MVVM), Performance Optimization, Kotlin Multiplatform Mobile (KMM), User Permissions
iOS Developer
2024 - 2024
Fogale Optique
- Researched and developed a GPU-based focus finder algorithm using Swift + Metal.
- Architected and developed a photo stabilization algorithm using OpenCV.
- Integrated a depth estimation neural network into the application.
- Gave directions and suggestions to increase the efficiency of our development efforts.
Technologies: iOS, iOS Camera, Camera API, Unity, Virtual Reality (VR), Core ML, Quantization, Mobile Apps, REST APIs, Optical Character Recognition (OCR), Machine Vision, Code Scanning, Mobile, Mobile Applications, Hybrid Apps, APIs, Libraries, App Development, Ktor, Design, Front-end Development, iOS App Development, Software Development Toolkits (SDK), Application Architecture, Model View ViewModel (MVVM), Performance Optimization, Kotlin Multiplatform Mobile (KMM), SwiftUI, Security, User Permissions
Senior Android Full-stack Developer
2024 - 2024
Marcin Tobala Digital Media
- Wrote up the Firebase back-end architecture for a travel app with gamification elements.
- Designed the NoSQL database schema, cloud functions, and storage layout.
- Sketched out the offline behavior of the application.
- Estimated the cost of the back-end services, including the DB, storage, cloud functions, and CDN.
Technologies: Android, Architecture, Kotlin, Firebase, Google Cloud, Amazon Web Services (AWS), Mobile Apps, REST APIs, Mobile, Mobile Applications, Geolocation, Push Notifications, Full-stack Development, App Development, Kotlin Multiplatform, Ktor, Design, Front-end Development, PostgreSQL, Application Architecture, Model View ViewModel (MVVM), SwiftUI, User Permissions
Senior Android Developer
2023 - 2023
MySeat.com Media Inc.
- Developed features into various apps of the client's portfolio. I used Kotlin, Java, and Jetpack Compose combined with the classic Android View system.
- Developed, tested, and deployed a major feature into one of the apps in the 1st week of the engagement.
- Helped transition the codebase from legacy networking to Retrofit-based and from the Android View system to Jetpack Compose, and made various improvements.
Technologies: Kotlin, Java, Android, Android Jetpack, Figma, Jetpack Compose, Mobile Apps, REST APIs, Mobile, Mobile Applications, Geolocation, Push Notifications, App Development, Ktor, Design, Front-end Development, PostgreSQL, Application Architecture, Model View ViewModel (MVVM), Kotlin Multiplatform Mobile (KMM), SwiftUI, User Permissions
iOS Developer
2023 - 2023
Honk Honk Punch Pty Ltd
- Researched the Criminisi algorithm to implement it on Metal for iOS.
- Ported a Lua and OpenGL-based Criminisi implementation to Metal for iOS.
- Converted GLSL shaders to Metal Shading Language and translated Lua code to Swift.
- Wrote a single-file Swift library that performs the Criminisi computation as a series of fragment shader executions. The library renders results to frame buffers and feeds intermediate buffers to subsequent computations.
Technologies: Image Processing, Machine Learning, Swift, Metal, iOS, ImageIO, Image Manipulation, 2D, WebGL, Shaders, Mobile Apps, REST APIs, Machine Vision, Mobile, Mobile Applications, Hybrid Apps, APIs, SDKs, Libraries, App Development, Design, Front-end Development, iOS App Development, Software Development Toolkits (SDK), Application Architecture, Model View ViewModel (MVVM), Performance Optimization, Kotlin Multiplatform Mobile (KMM), SwiftUI, User Permissions
Android Engineer
2022 - 2023
Cruise
- Worked on the in-car experience team of Cruise. I was in charge of the in-car UX development of the Bolt and Origin vehicles.
- Developed the first full-screen features of the in-car app in the Bolt vehicles deployed in San Francisco.
- Built full-screen feature, a game that riders can play while they travel to their destination. I built it using Kotlin and Android Views. Kotlin Flows were used heavily.
- Developed the FM music feature in the Bolt vehicle.
- Wrote Jetpack Compose components for the new Origin vehicle's in-car experience. I developed the 1st trip experience and parts of Federal Motor Vehicle Safety Standards (FMVSS) self-certification.
Technologies: Android, Kotlin, Functional Reactive Programming, Android Architecture, Coroutines, Android Jetpack, Jetpack Compose, Mobile App Development, Mobile Development, Mobile Apps, REST APIs, Mobile, Mobile Applications, Geolocation, App Development, Kotlin Multiplatform, Ktor, Advanced Driver-assistance Systems (ADAS), Design, Front-end Development, PostgreSQL, Software Development Toolkits (SDK), Application Architecture, Model View ViewModel (MVVM), Performance Optimization, Kotlin Multiplatform Mobile (KMM), User Permissions
Android Developer
2022 - 2022
Berbix
- Worked on the client's Android SDK and refactored legacy code to modern standards for the image processing pipeline.
- Reduced memory usage by architecting a reusable buffer system.
- Resolved long-standing bugs related to memory exhaustion.
- Prototyped a machine learning system for automatic object detection and recognition.
Technologies: Android, Android App Design, SDKs, Android Architecture, Architecture, Kotlin, Gradle, Image Processing, Firebase, Mobile App Development, Mobile Development, Mobile Apps, REST APIs, Optical Character Recognition (OCR), Machine Vision, Code Scanning, Mobile, Mobile Applications, APIs, Libraries, Push Notifications, App Development, Kotlin Multiplatform, Ktor, Design, Front-end Development, Software Development Toolkits (SDK), Application Architecture, Model View ViewModel (MVVM), Performance Optimization, User Permissions
C++ Software Engineer
2021 - 2022
Varian Medical Systems International
- Contributed to high and low-level parts of the software stack, wrote and designed UI elements in C++ and Qt, and worked on the DICOM layer.
- Fixed numerous bugs in the Android app running on a handheld device.
- Improved the overall responsiveness by eliminating ANRs and modernized the outdated app codebase.
Technologies: Qt, C++, Ubuntu, Linux, Android, Android SDK, Gradle, Git, Jenkins, Optical Systems, User Experience (UX), Full-stack, C++14, C++17, Mobile App Development, Leadership, REST APIs, Machine Vision, Mobile, Mobile Applications, SDKs, Artificial Intelligence (AI), App Development, Design, Front-end Development, PostgreSQL, Application Architecture, Model View ViewModel (MVVM), User Permissions
Android Developer | Co-founder
2016 - 2021
VIMAGE App Ltd.
- Developed a photo editor Android application and helped it become a leader in mobile photo animation, reaching more than five million downloads and winning multiple awards.
- Trained and deployed a neural network with PyTorch that selects the sky on a photo. Wrote tools in Python and Java to scrape training data, process the scraped images, train the network, convert the network to TorchScript, and generate data for QA.
- Developed a path-based animation tool using OpenGL ES and OpenCV for triangulation. To avoid the need to rewrite our whole rendering pipeline, I wrote a bridge to bring this tool into our Canvas-based library.
- Built the asset handling stack, including the admin tools for asset uploading (JavaScript, Firebase SDK), the back end for asset processing mechanism (Node.js, Firebase Cloud Functions, DigitalOcean Spaces), and Android side asset caching.
- Wrote a prototype iOS app that can apply dynamic GLSL shaders to photos. Wrote bridges to connect SwiftUI with GLKView and Swift with the underlying C++ rendering engine.
- Brought a spin-off app from conception to production. Being the sole developer of the app, it reached more than 100,000 downloads. Built a cross-platform rendering engine in C++, wrote shaders, and built tooling scripts in Python.
- Wrote a shader editor in JavaScript using Web Components, built a code editor with full GLSL syntax highlighting based on CodeMirror, and wrote automatic UI generation for the uniform parameters in the fragment shader.
- Led a team of five developers, conducted the technical screening of our applicants, and came up with and evaluated the take-home exercises.
Technologies: Android SDK, Android NDK, OpenGL ES, PyTorch, Firebase, Node.js, JavaScript, Kotlin, Java, Gradle, JSON, HTML, CSS, HTML5, User Experience (UX), RxJava, GitHub, Android Development, Google Play Store, App Store, Android App Design, AVFoundation, Core Image, UIKit, Video Editing, React, 3D Graphics, Amazon Web Services (AWS), Full-stack, Electron, Xcode, Mobile App Development, Mobile Development, Image Processing, Machine Learning, Metal, Image Manipulation, Leadership, FFmpeg, Skia, x264, 2D, Technical Leadership, Shaders, React Native, Expo, Core ML, Quantization, Mobile Apps, FlutterFlow, REST APIs, Machine Vision, Google Vision AI, Mobile, Mobile Applications, Hybrid Apps, APIs, Libraries, Geolocation, Artificial Intelligence (AI), Push Notifications, Full-stack Development, Webhooks, App Development, React Native for Web, TypeScript, Design, PostgreSQL, Application Architecture, Model View ViewModel (MVVM), Azure DevOps, Security, User Permissions
Windows Phone Developer
2014 - 2016
Bitnet Group Ltd.
- Developed online shopping applications for multi-national companies. Implemented multiple check-out mechanisms and worked with the PayPal API. Implemented an automatic background polling mechanism to sync the users' virtual basket with the back end.
- Introduced a way to implement real-time barcode scanning in Windows Runtime apps. Before that, there were no working real-time solutions for barcode scanning, only for Silverlight applications.
- Wrote an app with fully dynamic UI, where all the UI elements, screen flow, and actions were described by a JSON. Wrote a custom rich-text parser and renderer as part of this project.
Technologies: C#, Visual Studio, .NET, Mobile Development, Mobile Apps, REST APIs, Code Scanning, Mobile, Mobile Applications, Push Notifications, App Development, Design, Front-end Development, Application Architecture, User Permissions
Experience
VIMAGE App
https://play.google.com/store/apps/details?id=com.vimage.androidVIMAGE is an Android application that can animate photos.
I played a key role in handling the effect uploader, OpenGL ES-based rendering tools, our on-device sky segmentation neural network on PyTorch, Firebase back end, and admin tools. I led a team of five developers.
I played a key role in handling the effect uploader, OpenGL ES-based rendering tools, our on-device sky segmentation neural network on PyTorch, Firebase back end, and admin tools. I led a team of five developers.
Expose App
https://play.google.com/store/apps/details?id=com.vimage.exposeExpose is a Koltin-based Android application that can apply GLSL shaders to photos, with the core rendering engine written in C++ to make it reusable and cross-platform.
I built a prototype shader editor in JavaScript, a prototype iOS app to showcase the cross-platform engine, and Python-based utility tools for shader processing.
I built a prototype shader editor in JavaScript, a prototype iOS app to showcase the cross-platform engine, and Python-based utility tools for shader processing.
MedNES
https://github.com/wpmed92/MedNESAn open-source, cross-platform NES emulator written in C++. It has 200 stars on GitHub and contributions received from other users. I ported it to the web by compiling it to WebAssembly using Emscripten.
Radiosheets
https://github.com/wpmed92/xreportRadiosheets is a structured reporting platform for radiologists. It is a form builder tailored specifically to radiological use-cases.
I built a template builder and scripting language in JavaScript and shipped it as a library bundled with webpack. The app itself is a SPA built with Angular. I wrote an article about it in a peer-reviewed scientific journal called SoftwareX, made it open-source, and published it on GitHub.
I built a template builder and scripting language in JavaScript and shipped it as a library bundled with webpack. The app itself is a SPA built with Angular. I wrote an article about it in a peer-reviewed scientific journal called SoftwareX, made it open-source, and published it on GitHub.
Porting Stable Diffusion to tinygrad WebGPU
https://github.com/softwiredtech/stable-diffusion-webgpuI ported Stable Diffusion to WebGPU using tinygrad. For this, I added support for multi-input model export and wrote f16 to f32 conversion WebGPU kernel for fast client-side model decompression. The model is exported in three parts: text model, diffusor, and decoder. These three nets are invokable separately from JavaScript. The number of steps and guidance are controllable parameters. The model is cached on the client side in IndexedDB. Only decompression is needed to run the model when cached so it won't be re-downloaded.
tinygrad WebGL Back End
I built a WebGL2 back end by emulating a general-purpose graphics processing unit (GPGPU) using textures and fragment shaders.
Runtime: https://github.com/tinygrad/tinygrad/blob/master/extra/backends/ops_webgl.py
GLSL CodeGen: https://github.com/tinygrad/tinygrad/blob/master/extra/backends/cstyle.py
YOLOv8 demo: https://github.com/softwiredtech/yolov8-tinygrad-webgl/tree/main
Runtime: https://github.com/tinygrad/tinygrad/blob/master/extra/backends/ops_webgl.py
GLSL CodeGen: https://github.com/tinygrad/tinygrad/blob/master/extra/backends/cstyle.py
YOLOv8 demo: https://github.com/softwiredtech/yolov8-tinygrad-webgl/tree/main
Education
2017 - 2022
PhD in Medical Imaging
University of Pécs - Pécs, Hungary
2011 - 2017
Doctor of Medicine in Medicine
University of Pécs - Pécs, Hungary
Skills
Libraries/APIs
React, OpenGL ES, Node.js, Core Image, WebGL, FFmpeg, REST APIs, React Native for Web, PyTorch, RxJava, WebGPU, Skia, x264, Three.js, Camera API
Tools
Android Studio, Android NDK, Gradle, NPM, GitHub, Expo, Git, Emscripten, Visual Studio, Jenkins, Webpack, Angular CLI, Android Jetpack, Xcode, Figma, Google Vision AI
Languages
JavaScript, Kotlin, Java, C++, Python, Swift, TypeScript, C++14, C++17, C#, HTML, HTML5, CSS, Objective-C, Verilog
Frameworks
Android SDK, Electron, React Native, Flutter, Ktor, UIKit, SwiftUI, Core ML, .NET, Qt, Angular, Metal, ImageIO, Unity, ARKit, AWS HA, Redux
Paradigms
Mobile Development, App Development, Application Architecture, Model View ViewModel (MVVM), Functional Reactive Programming, GPGPU, Agile, Azure DevOps
Platforms
Firebase, Android, iOS, Amazon Web Services (AWS), Mobile, MacOS, Visual Studio Code (VS Code), Ubuntu, Linux, Docker, Kubernetes, Unix, FlutterFlow, Replit
Storage
JSON, PostgreSQL, Google Cloud
Other
Android Development, Video Editing, Image Manipulation, Mobile App Development, Stable Diffusion, Mobile Apps, WebSockets, Mobile Applications, Hybrid Apps, APIs, Architecture, Google Play Store, Android App Design, SDKs, Image Processing, AVFoundation, Full-stack, Jetpack Compose, Machine Learning, Shaders, Large Language Models (LLMs), Reverse Engineering, App Clips, Optical Character Recognition (OCR), Machine Vision, Libraries, Geolocation, Artificial Intelligence (AI), Push Notifications, Full-stack Development, Subscriptions, Kotlin Multiplatform, Design, Front-end Development, Cursor AI, Vibe Coding, iOS App Development, Software Development Toolkits (SDK), Performance Optimization, Kotlin Multiplatform Mobile (KMM), Security, User Permissions, Medical Imaging, WebAssembly (Wasm), CTO, Leadership, User Experience (UX), Optical Systems, App Store, Android Architecture, Coroutines, 3D Graphics, 2D, Technical Leadership, iOS Camera, Virtual Reality (VR), Objective-C++, Cryptography, Quantization, Convex, Decompilation, Code Scanning, Webhooks, Google AdMob, Ads, Advanced Driver-assistance Systems (ADAS)
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