Back-end Engineer
Server Reliability Engineer

Design architecture and data structure.
Build the product from 0 to 1.

Developed a health group monitoring system, specifically for the cardiovascular health and respiration related diseases.
Brings a smart and comfort way helping people identify if they are deemed at the risk of CVD and OSA then go for further medication. 

• Products:
  • Beatinfo Mountain
    • Health monitoring system for climbers, could record real-time physiological signals such as respiration, skin temperature, one-lead ECG signals, and the location of climbing party.
    • Providing climbing plan, temperature, RH, and POP for climbers.
    • Aiming to prevent mountaineering disasters.
      
      
  • Beatinfo Health
    • Health monitoring system for health management, could record real-time physiological signals such as respiration, skin temperature and one-lead ECG signals.
    • Providing HRV analysis, PSG, CVD, and health report.
      
      
• Design and build the Cloud Architecture.
  
  • Firebase authentication as user verification.
  • Nginx as a reverse proxy server for HTTP, HTTPS and Web Socket protocols, as well as a load balancer.
  • Gunicorn as a Python WSGI HTTP Server.
    
    
• Design and build the project architecture with Flask.
  
  • Writing integration test with Pytest to ensure the reliability.
    
    
• Design the data structure of MySQL and MongoDB.
  
  • Use SQLAlchemy and ORM to defined MySQL data table and accessed database.
  • Use MongoEngine and ORM to accessed NO-SQL database.
    
    
• Assist Product Manager in defining System flow.
  

E-Commerce Team (2019/01~2020/06)

Develop shopping services and increasing sales performance by promotion modules.
Design and build payment flow and payment logistics integration.

• Sales promotion Module
  • Re-design and built new promotion module with Factory Pattern, and made the following new types of promotion could reuse it.
  • Writing unit test to ensure the reliability. (xUnit)
    
    
• Promotion Engine
  • Co-working with the arch team to build the calculation method of sales promotion on docker.
    
    
•  Add payment method: JKoPay
  • Designed and built new Third-Party Payment flow. (LinePay, ApplePay, MoPay, JKoPay)
  • Designed and built repay flow.

Server Reliability Group (2017/09~2019/01)

Improving system effective to make sure system reliability and online 24 hours.

• Consultant
  • Giving feature teams advice on avoiding performance issues.
  • Supporting the DBA team to improve query performance with T-SQL tuning and LINQ tuning.
  • Identified potential risks by user behavior analysis. (Application Insight, Cloud Watch)
    
    
• Special forces 
  • Complete urgent tasks in time.
    
    
• Emergency department
  • Identified the cause of emergency issues, and advised feature team how to fix it.
  • Giving the first aid treatment to the emergency issues, preventing enlargement loss.

• Successfully supervised 3 members to achieved the most efficient team
  • Reached a historic high count of monthly fixed issue.
  • Identified the causes of system that troubled for many years and fixed them perfectly.
    
    
• Re-architecture cloud machines of Online store management System
  • Separated the website server and the API server, rewriting CI/CD flow behavior.
  • Reducing the cost of EC2 on AWS about 57%.
  • Increasing the speed of CI/CD flow twice as the origin.
    
    
• Re-designed the CI/CD flow of the foreground system
  • Increasing the efficiency by 6 times.
    
    
• Designed and Built the CI/CD flow of the queue system (use Golang)
  • Saving 40 minutes per deployment.
  • Improving education cost of “how to release”.
    
    
• Create operating manuals for all the CI/CD flows
  • Making a simple way to learn CI/CD.

Developed Manufacturing Execution System(MES) and import it to promote customer's production efficiency.

• Develop Hybrid Application with Angular/Cordova.
• System Analysis.
• System Design.
• Testing Report.