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Ayesh Qumhieh
Verified Expert in Engineering
Software Developer
Berlin, Germany
Toptal member since April 11, 2013
Bio
Ayesh is a self-motivated developer who loves challenges and problem-solving. He's always ready for tough assignments and enjoys learning new technologies and frameworks. Above all, Ayesh's goals are to continuously improve his development skills while achieving the best results for his clients.
Portfolio
Harri
Retrofit 2, Dagger 2, RxJava, Java, Kotlin, Android, Amazon Web Services (AWS)...
Delivery Hero
Android, Kotlin, Kotlin Flows, Coroutines, Jetpack Compose, Android Jetpack...
Squid Tooth
Kotlin, Android, Android Architecture, Firebase, Automated Testing, Analytics...
Experience
- Android - 13 years
- Java - 12 years
- Retrofit 2 - 7 years
- Dagger 2 - 6 years
- Kotlin - 6 years
- Coroutines - 4 years
- Kotlin Flows - 4 years
- Model View ViewModel (MVVM) - 4 years
Work Experience
Senior Android Engineer
2017 - PRESENT
Harri
- Introduced major architecture and codebase refactoring across multiple Android apps, improving code quality, scalability, and performance.
- Designed extremely complex UI widgets required for very specific and detailed features that are not available as open source.
- Oversaw team building, interviewing and evaluating engineering candidates, training, and skills and knowledge sharing, which significantly improved the quality of the Android engineering team.
Technologies: Retrofit 2, Dagger 2, RxJava, Java, Kotlin, Android, Amazon Web Services (AWS), Coroutines
Senior Android Engineer
2025 - 2025
Delivery Hero
- Contributed to the design, development, and testing of key features across Android application features.
- Worked on critical performance optimization solutions, reducing memory pressure, and managing critical resources in critical memory states.
- Contributed to a refactoring project, developing top-quality Compose UI screens.
Technologies: Android, Kotlin, Kotlin Flows, Coroutines, Jetpack Compose, Android Jetpack, Clean Architecture
Android Developer
2022 - 2023
Squid Tooth
- Performed major codebase refactoring to implement the latest Android Jetpack components.
- Implemented dependency injection using Hilt, improved unit and UI tests, and enhanced the app's performance.
- Fixed many bugs and memory leaks that the client did not notice.
- Conducted numerous Firebase experiments to improve user retention.
Technologies: Kotlin, Android, Android Architecture, Firebase, Automated Testing, Analytics, A/B Testing, Amazon Web Services (AWS)
Senior Android Engineer
2021 - 2022
ATN Channel 7
- Handled difficult bugs impacting navigation and user experience.
- Created various customized UI components, including different banners for the Android TV app.
- Worked on both unit and UI tests, as well as performance optimization.
Technologies: Kotlin, Android TV, Android, Amazon Web Services (AWS)
Expert Android Developer
2021 - 2021
Nouvel Angle
- Did complete code refactoring for an Android app using legacy Android Java. Also used Kotlin with the latest recommended Android Jetpack and architecture components. Here's the link: play.google.com/store/apps/details?id=com.souffleurderevesapp.app.
- Helped identify and fix back-end and API bugs and recommended future code improvements.
- Implemented the app's audio streaming player using ExoPlayer.
Technologies: Java, Android, Kotlin, Amazon Web Services (AWS)
Android Developer
2020 - 2021
Kit Enterprises
- Improved and debugged a point-of-sale Android application that works on an Android-based smart POS machine made by PAX Technology.
- Created a JavaScript bridge to communicate between HTML and JavaScript-based screens with app core functionality.
- Customized a secondary screen layout for showing the customer's cart and bill.
Technologies: Java, Android, Kotlin, Amazon Web Services (AWS)
Android Developer
2020 - 2020
Visual ID
- Implemented a "companion" Android application installed on custom Android TV devices.
- Worked on the application, which manages and reports custom devices by collecting analytics and performance metrics and remotely runs super-user commands: updating, downgrading, uninstalling, and installing other apps.
- Created the complete documentation of the app's architecture, as well as provided references and recommendations for future app development and improvement.
Technologies: Android, REST APIs, Kotlin, Amazon Web Services (AWS)
Senior Android Engineer
2015 - 2017
Microsoft ILDC
- Developed in native Android, JUnit, and UI testing, working closely with product and design when planning for new features.
- Tracked and fixed bugs using Microsoft's TFS as a reporting tool.
- Helped improving application performance and memory management drastically by redesigning cache architecture.
Technologies: Android, Amazon Web Services (AWS)
Software Engineer
2010 - 2015
InfiniteTiers, Inc.
- Designed, implemented, and marketed a location-aware Android application that facilitates the process of of car accident insurance investigations.
- Implemented HTTP multipart/form data for files uploaded from Android phones (images captured by phone camera), with Servlets for back-end development.
- Collaborated with development team members for a peer-to-peer chat application for Android which supported instant-messaging, group chat, peer-to-peer multi-files transfer, and audio calls.
- Built a complete end-to-end API for transfering files peer-to-peer over the web for Android, including both the client-and server-side components.
- Built and configured mutiple C/C++ APIs for the Android platform with Android NDK, CMake, and GNU-Make, which made use of JRTPLIB, EMIPLIB, and speex audio codecs.
- Handled remote installation and configuration of Asterisk VOiP server on CentOS linux.
Technologies: Android NDK, Android, Java SE (Core Java)
Software Engineer
2010 - 2010
InfiniteTiers, Inc.
- Worked as a member of a web development team in the creation of a purchase order management system.
- Researched performance optimization solutions for our, project which included client-side Ajax modifications and heavy transaction modifications in a SQL database.
- Contributed to the development of a POS product using Microsoft Windows Forms applications in C#.
- Created ASP.NET reporting tools for the POS product.
Technologies: C#
Project History
Aywa | Video on Demand
A video-on-demand streaming application for movies and TV shows targeting the Middle East and Arab audiences.
I worked on the core architecture and wireframe design for all screen sizes (phones, tablets, and Android TVs). I also implemented adaptive video streaming for movies and a list of TV show episodes using ExoPlayer.
I worked on the core architecture and wireframe design for all screen sizes (phones, tablets, and Android TVs). I also implemented adaptive video streaming for movies and a list of TV show episodes using ExoPlayer.
Microsoft Power BI
https://play.google.com/store/apps/details?id=com.microsoft.powerbimMicrosoft Power BI for Android.
Harri
https://play.google.com/store/apps/dev?id=7215430685200492330I was an Android engineer working simultaneously on five Android apps.
Harri mobile applications helps clients in the hospitality industry in different areas, from jobs searching, recruiting, and interview scheduling as well as phone screening, onboarding, and team management to schedules, shifts, breaks, clock-ins and outs, vacations, and much more.
My job on a daily basis includes design, architecture, new feature implementation, and code review.
Harri mobile applications helps clients in the hospitality industry in different areas, from jobs searching, recruiting, and interview scheduling as well as phone screening, onboarding, and team management to schedules, shifts, breaks, clock-ins and outs, vacations, and much more.
My job on a daily basis includes design, architecture, new feature implementation, and code review.
Topsort Analytics Android Library
An Android library for reporting customized analytical events, plus a sample Android application to showcase how to use the library in both Kotlin and Java, as well as documentation.
The developer who uses this library can easily setup the library first and do many kinds of events reporting. The library will cache all events seamlessly first, then start a background job that uploads all events based on the device's battery state, idle state, and network type.
The developer who uses this library can easily setup the library first and do many kinds of events reporting. The library will cache all events seamlessly first, then start a background job that uploads all events based on the device's battery state, idle state, and network type.
Vaulty Application
https://play.google.com/store/apps/details?id=com.theronrogers.vaultyfreeA native Android vault application to securely store, hide, and sync all kinds of media with a password, pin, and bio-metric credentials.
As a senior Android engineer, my tasks included optimizing the codebase to use the latest API available in the Android SDK, applying the latest and most recommended architecture and design patterns to improve codebase quality, improving the app's performance, and fixing major bugs the client had difficulty with. I also conducted numerous A/B tests using Firebase, significantly improving user retention.
As a senior Android engineer, my tasks included optimizing the codebase to use the latest API available in the Android SDK, applying the latest and most recommended architecture and design patterns to improve codebase quality, improving the app's performance, and fixing major bugs the client had difficulty with. I also conducted numerous A/B tests using Firebase, significantly improving user retention.
Education
2004 - 2009
Bachelor's (B.Sc.) Degree in Computer Science
An-Najah National University - Nablus, West Bank Palestine
Skills
Libraries/APIs
Google Gson, jQuery, jQuery UI, RxJava, Retrofit 2, REST APIs, Kotlin Flows
Tools
Android NDK, Java Concurrency, Android Studio, ExoPlayer, Microsoft Power BI, Android Jetpack
Languages
Java, Kotlin, C#, JavaScript, Java SE (Core Java)
Frameworks
Dagger 2, KOIN, Rx
Paradigms
Object-oriented Programming (OOP), Design Patterns, Model View ViewModel (MVVM), Agile Software Development, Automated Testing, Clean Architecture
Platforms
Android, Firebase, Android TV, Amazon Web Services (AWS)
Other
Hilt, Multithreading, Coroutines, Code Architecture, Android Architecture, Analytics, A/B Testing, Jetpack Compose, Software Engineering
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