Yafei Chai
Greenbelt,MD
Summary
- Experienced permanent resident with 6 years of expertise in Android Java development, including knowledge of Kotlin and Jetpack Compose.
- Demonstrated leadership and participation in various projects, such as developing crime scene investigation information systems for Android tablets, autopsy systems for Android tablets, facial detection SDK for smartphones, handheld identity verification devices, and turnstile identity verification systems.
- Possesses strong understanding of Java multithreading and exceptional problem-solving and analysis skills.
- Self-motivated learner who quickly acquired proficiency in Flutter cross-platform and backend development within a year.
- Currently overseeing external testing of a church app on the App Store and internal testing on Google Play.
Overview
6
6
years of professional experience
Work History
Technical Manager
Beijing Ivsign Technology Co., Ltd.
02.2016 - 05.2018
- Company Overview: As a subsidiary of Beijing Hisign Technology Co., Ltd
- I was transferred to this subsidiary as the technical manager of the Android development department in2016 to manage the product of Live Face Matching for Android
- Live Face Matching is developed into several products and projects that are used in many scenarios, such as access control for hotels and shopping malls, verification of real-name ticketing, surveillance systems, and so on
- My main tasks and responsibilities were as follows:
- Resolved bugs that were difficult to fix within the department to ensure project progress
- Guided the algorithm department, testing department and development department to solve the problem of occasional abnormal exit of the application to ensure the stability of the product
- Assigned development tasks, was responsible for interviews with the Android team, maintained team stability, and promoted team development
- Collaborated with product department and testing department to ensure the progress of different projects meets expectations
Android Software Developer
Beijing Hisign Technology Co., Ltd
04.2013 - 02.2016
- 2013 -2015 developed and maintained the tablet side of the Crime Scene Investigation Information System
- The Crime Scene Investigation Information System is used for the input and preservation of information on the crime scene
- That makes it possible to standardize and digitize the input of information at all levels of the public security sector, and the scene information is the basis for case analysis
- Digitization and standardization make crime case information easier to query and search and serve as an information entry point for other criminal case analysis systems
- My main jobs were to solve memory leaks, fix bugs, and regular feature development
- My biggest value to the product was solving the stability issues
- 2013.5 -2015.8 Pre-technical research and development of the Alpha version of the autopsy system for the tablet
- This product was used for forensic autopsy, using the tablet instead of paper to input, save and display information, and uploaded to the server as a data source for other crime case analysis systems
- I was responsible for the3D human body model display and interaction
- That was the difficult point of this product, also the key point to attract customers to buy and use it
- Since the3D models needed to be displayed and operated on the desktop, and the C# developers on the desktop lacked the knowledge of3D and Unity, I helped to develop the relevant programs for the desktop version
- Live Face Matching for android development
- As a team leader, my team and I accomplished the following:
- Implemented basic functions, such as head nodding, head shaking, blinking motion recognition, and user interaction
- Tested the feasibility of various indicators
- For example, testing the effectiveness of parameters such as light intensity and sharpness on image quality control in the real environment
- Collaborated with the algorithm department to help them optimize the performance or metrics
Android Engineer
Beijing Xinyuan Ruiji Information Technology Co. Ltd.
06.2012 - 03.2013
- Customized component development
- Solved computational as well as technical implementation difficulties due to the use of non-rectangular touch areas for custom components
Day Trader
Freelance
05.2008 - 09.2010
Education
Undergraduate diploma - Electronical Information Science and Technology
Hubei University of Automotive Technology (HUAT)
06.2007
Skills
- JVM GC
- Android
- C#
- Mobile Application Development
- Technology Management
- Eclipse
- Android Studio
- Kotlin
- Git
- Java programming
- UI and UX design
Career Break
- Full-time parenting
- May2021 - Nov2023
- 2 yrs7 mos
- Prince George's County, Maryland
- Hard but happy times. Parenting is harder than I thought but words can't describe the joys of raising children.
Community Service
CRU's campus ministry at UMD, Friday Night for International Student Club (IFC), Voluntary work, Prince George's County, Maryland, 2018-08, 2021-05, I came to the United States in May of2018 due to my wife's work at the University of Maryland as a scientist. Starting in August, I began to participate as a volunteer in CRU's campus ministry at UMD, Friday Night for International Student Club (IFC)., During this period, I have met many international students and have seen the differences and common needs of people of different faiths. I saw the huge differences between China and the United States, both on a societal level and in individual thinking. These differences have changed my understanding of the world.
Timeline
Technical Manager
Beijing Ivsign Technology Co., Ltd.
02.2016 - 05.2018
Android Software Developer
Beijing Hisign Technology Co., Ltd
04.2013 - 02.2016
Android Engineer
Beijing Xinyuan Ruiji Information Technology Co. Ltd.
06.2012 - 03.2013
Day Trader
Freelance
05.2008 - 09.2010
Undergraduate diploma - Electronical Information Science and Technology
Hubei University of Automotive Technology (HUAT)
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