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Definition of Reputation Credits
Denny Cheng ( 鄭翔元 )
I am a software engineer with diverse skills. From 2016 to 2018, I was responsible for Android and backend development (Python Flask). From 2019 to 2023, my main focus was on Flutter and React. In addition, I also use C# for side project development. My skill set spans across the development of applications for various platforms, and I maintain a curious and learning-oriented attitude towards new technologies.
Taipei, Taiwan [email protected]
Education
2010 - 2014
National Cheng Kung University ( 國立成功大學 )
Computer Science and Information Engineering ( 資訊工程學系 )
Work Experience
Software Engineer • Velodash ( 沛司科技股份有限公司 )
Apr 2019 - Oct 2023 | Taipei, Taiwan
In this company, I am responsible for the development of both mobile apps and webpages. I worked on two major projects. The first one is the B2B-side application called Staff (Web/Android/iOS), and the second is the B2C-side project called Velodash (Web/Android/iOS). Due to the similarity in functionality between the web and app, to reuse the same codebase, both are developed using Dart. The difference lies in the web version using Dart React, while the app utilizes Flutter. I also place emphasis on the separation of business logic and UI design.
The scope of the project covered various features such as adding new route and events, exploring events and routes created by others, viewing live events, personal profiles, inboxes, user communication, disaster reporting, and more. The following are some key aspects:
- Utilized MobX as a state manager and Drift as a local database. WebSocket was employed to ensure synchronization between local data and server data.
- In 2020, due to the immaturity of Flutter Web, the web version was developed using the Dart version of React.
- While web and app share common business logic, there are still some differences in implementation (e.g., which API to use). Therefore, I utilize get_it and injectable as Dependency Injection tools to facilitate easier implementation swapping.
- On the app side, when certain native functionalities lacked plugin support, communication with the native platform was established using Method Channel, for example, with flutter_barometer.
- On the web side, since Dart React developers do not primarily focus on static typing, I created a custom tool called type_react . It uses code generation technology to automatically parse class field names and convert them into corresponding React objects.
- Docker was employed for deploying the web version.
Skills Summary: Dart, Flutter, react, mobx, drift, event_bus, method channel, code generation, Docker
Software Engineer • Addweup ( 艾威奧普股份有限公司 )
Sep 2016 - Feb 2019 | Taipei, Taiwan
During my time at Addweup, I independently developed the mobile and tablet app components of the project. DEMO Video 1 and DEMO Video 2.
- Initially, I used Java, and later transitioned to Kotlin for development.
- The project was built using the MVP (Model-View-Presenter) architecture.
- Communication between devices was facilitated through Bluetooth, and additional features on the mobile side involved utilizing the camera and microphone.
- A significant use of Fragments was incorporated in the project to simplify data transfer between different screens.
- For enhanced security, AES encryption was applied when sending requests to the backend.
I also provide additional support for Python Flask backend development.
- Add type hints and unit tests to legacy code.
- Fixed issues related to login/logout, timezone, and refunds.
- Drafting the encryption process.
Skills Summary: Java, Kotlin, Android, MVP, Python, Flask, Pycrypto, Restful API, pytest
Other Projects
GodotSharpKit ( C# Source Generator ) • Jun 2023 - Now
Nuget / Github / Motivation behind the production ( 製作緣由 )
A C# Source Generator designed for the Godot game engine. The motivation behind this project stems from the engine's issues with C# support, often requiring extensive boilerplate code. To address this, a new project was initiated to automate code generation. The main functionalities of this project include:
- Generating OnReady code.
- Generating code for resource locations.
- Generating code for communication with GDScript.
- When producing code, utilizing "record" to carry metadata, enhancing the efficiency of the Source Generator. This helps prevent redundant code generation resulting from edits to the source code.
Skills Summary: C#, Godot, Source Generator
Remnant 2 - DPS Calculator (Flutter Web) • Nov 2023
Demo / Github / Introduction (Chinese).
I created this program to save time on manual calculations during gaming.
- Expectancy and DPS Calculation.
- Users can add equipment, items, and skills. User also can save builds.
- Users can export/import builds and items.
- Utilizes Bloc for state management. Incorporates the freeze library, making it easier to create immutables.
- Deployed on Netlify.
Skills Summary: Dart, Flutter Web, bloc
回家 - Homeward ( Godot ) • Mar 2020 - Feb 2022
Steam version / Android version / iOS version
A small game developed with friends. This game is created using the Godot engine and is a casual puzzle-solving game. Players can use clicks to move obstacles and help the character reach the destination.
Skills Summary: Godot
節奏遊戲與刻字大師 ( Android ) • Aug 2017 - Nov 2017
This is a contracted piece of work. DEMO
It contains two small games: one involves a beat game controlled through gestures, while the other allows users to 'write' a word by rotating their eyes.
- Adopted MVP as the primary architecture.
- Integrated eye tracking and gesture recognition APIs provided by the contracted vendor.
- Extensively utilized TextureView for customized animations.
Skills Summary: Android, Java, MVP, TextureView
家有大貓 - Nekojishi ( Renpy / Python ) • Jul 2016 - Apr 2018
A PC game developed in collaboration with several friends. The game is built using the Ren'Py game engine, which employs a substantial amount of custom language and a minimal amount of Python (used for plugin functionality). My primary responsibilities include:
- Game Main Script: Involves scripting for branching narratives and flag creation.
- Multilingual Tool: Due to the small team size and limited resources for multilingual translation, a tool was created to allow the community to independently generate translations and import them into the game. This tool is written in Python using the PyQt library and distributed using pyinstaller.
Skills Summary: Renpy, python, pyinstaller
Denny Cheng ( 鄭翔元 )
I am a software engineer with diverse skills. From 2016 to 2018, I was responsible for Android and backend development (Python Flask). From 2019 to 2023, my main focus was on Flutter and React. In addition, I also use C# for side project development. My skill set spans across the development of applications for various platforms, and I maintain a curious and learning-oriented attitude towards new technologies.
Taipei, Taiwan [email protected]
Education
2010 - 2014
National Cheng Kung University ( 國立成功大學 )
Computer Science and Information Engineering ( 資訊工程學系 )
Work Experience
Software Engineer • Velodash ( 沛司科技股份有限公司 )
Apr 2019 - Oct 2023 | Taipei, Taiwan
In this company, I am responsible for the development of both mobile apps and webpages. I worked on two major projects. The first one is the B2B-side application called Staff (Web/Android/iOS), and the second is the B2C-side project called Velodash (Web/Android/iOS). Due to the similarity in functionality between the web and app, to reuse the same codebase, both are developed using Dart. The difference lies in the web version using Dart React, while the app utilizes Flutter. I also place emphasis on the separation of business logic and UI design.
The scope of the project covered various features such as adding new route and events, exploring events and routes created by others, viewing live events, personal profiles, inboxes, user communication, disaster reporting, and more. The following are some key aspects:
- Utilized MobX as a state manager and Drift as a local database. WebSocket was employed to ensure synchronization between local data and server data.
- In 2020, due to the immaturity of Flutter Web, the web version was developed using the Dart version of React.
- While web and app share common business logic, there are still some differences in implementation (e.g., which API to use). Therefore, I utilize get_it and injectable as Dependency Injection tools to facilitate easier implementation swapping.
- On the app side, when certain native functionalities lacked plugin support, communication with the native platform was established using Method Channel, for example, with flutter_barometer.
- On the web side, since Dart React developers do not primarily focus on static typing, I created a custom tool called type_react . It uses code generation technology to automatically parse class field names and convert them into corresponding React objects.
- Docker was employed for deploying the web version.
Skills Summary: Dart, Flutter, react, mobx, drift, event_bus, method channel, code generation, Docker
Software Engineer • Addweup ( 艾威奧普股份有限公司 )
Sep 2016 - Feb 2019 | Taipei, Taiwan
During my time at Addweup, I independently developed the mobile and tablet app components of the project. DEMO Video 1 and DEMO Video 2.
- Initially, I used Java, and later transitioned to Kotlin for development.
- The project was built using the MVP (Model-View-Presenter) architecture.
- Communication between devices was facilitated through Bluetooth, and additional features on the mobile side involved utilizing the camera and microphone.
- A significant use of Fragments was incorporated in the project to simplify data transfer between different screens.
- For enhanced security, AES encryption was applied when sending requests to the backend.
I also provide additional support for Python Flask backend development.
- Add type hints and unit tests to legacy code.
- Fixed issues related to login/logout, timezone, and refunds.
- Drafting the encryption process.
Skills Summary: Java, Kotlin, Android, MVP, Python, Flask, Pycrypto, Restful API, pytest
Other Projects
GodotSharpKit ( C# Source Generator ) • Jun 2023 - Now
Nuget / Github / Motivation behind the production ( 製作緣由 )
A C# Source Generator designed for the Godot game engine. The motivation behind this project stems from the engine's issues with C# support, often requiring extensive boilerplate code. To address this, a new project was initiated to automate code generation. The main functionalities of this project include:
- Generating OnReady code.
- Generating code for resource locations.
- Generating code for communication with GDScript.
- When producing code, utilizing "record" to carry metadata, enhancing the efficiency of the Source Generator. This helps prevent redundant code generation resulting from edits to the source code.
Skills Summary: C#, Godot, Source Generator
Remnant 2 - DPS Calculator (Flutter Web) • Nov 2023
Demo / Github / Introduction (Chinese).
I created this program to save time on manual calculations during gaming.
- Expectancy and DPS Calculation.
- Users can add equipment, items, and skills. User also can save builds.
- Users can export/import builds and items.
- Utilizes Bloc for state management. Incorporates the freeze library, making it easier to create immutables.
- Deployed on Netlify.
Skills Summary: Dart, Flutter Web, bloc
回家 - Homeward ( Godot ) • Mar 2020 - Feb 2022
Steam version / Android version / iOS version
A small game developed with friends. This game is created using the Godot engine and is a casual puzzle-solving game. Players can use clicks to move obstacles and help the character reach the destination.
Skills Summary: Godot
節奏遊戲與刻字大師 ( Android ) • Aug 2017 - Nov 2017
This is a contracted piece of work. DEMO
It contains two small games: one involves a beat game controlled through gestures, while the other allows users to 'write' a word by rotating their eyes.
- Adopted MVP as the primary architecture.
- Integrated eye tracking and gesture recognition APIs provided by the contracted vendor.
- Extensively utilized TextureView for customized animations.
Skills Summary: Android, Java, MVP, TextureView
家有大貓 - Nekojishi ( Renpy / Python ) • Jul 2016 - Apr 2018
A PC game developed in collaboration with several friends. The game is built using the Ren'Py game engine, which employs a substantial amount of custom language and a minimal amount of Python (used for plugin functionality). My primary responsibilities include:
- Game Main Script: Involves scripting for branching narratives and flag creation.
- Multilingual Tool: Due to the small team size and limited resources for multilingual translation, a tool was created to allow the community to independently generate translations and import them into the game. This tool is written in Python using the PyQt library and distributed using pyinstaller.
Skills Summary: Renpy, python, pyinstaller