Senior Backend Engineer at 畢竟科技股份有限公司，2022 / 07 - 2023/12

• Skills: Golang, PostgreSQL, Redis, Nats, MongoDB, Docker, Git
• Highlight:
1. BITGIN Exchange
• add unit test framework for project to make sure code's quality
• coupon and point system for marketing
• develop Defi strategy tool to make user more easy to participate in Defi investment
  
• questionnaire system for EKYC flow 
2. REYIELD.fi
• design and implement project framework
• telegram bot design and develop
  
• uniswapv3 bot with very simple flow:
• support auto rebalance to make investor get higher profit
• workflow framework to manage event handling

Technical Product Manager And Backend Team Lead at 天堂遊戲 (Paradise Soft)，2020 / 10 - 2022/05

• Skills: Golang, MySQL, Redis, Kafka, MongoDB, TiDB, Docker, Git
• Highlight:
  
1. Team Management
   
• Management of the backend team (25-30 members) includes performance evaluation, team cooperation, target planning, and training members.
  
• Lead team to implement unit test on every project and increase test coverage about 20%
• Holding a technical sharing session monthly
• Lead DevOps team to reduce about 33% cloud services cost
  
2. System infrastructure design
• Drive design architecture of the sportsbook system
  
• Average latency on odds synchronization is less than one second
• Wager throughput on single node is about 900 per second
• Lead team refactor report system for stable, flexible and maintainable
  
• Simplify data synchronization process, replace Canal, Cassandra to TiDB
• Make our system data latency seldom over 1 minute
• Reduce a half time on new feature development
3. Coding
• Design  and implement architecture of P2P payment system
  
• Optimize slow SQL query and reduce our system requirement
• Refactor payment system to reduce overall development time 30% on add a new payment

Backend Engineer at 天堂遊戲 (Paradise Soft)，2018 / 01 - 2020 / 10

• Skills: Golang, MySQL, Redis, Kafka, MongoDB, Docker, Git
• Highlight:
  
1. Save clients' time by automatically generating financial reports for them
2. Support clients to make the best business strategy by our BI system
   ex. warning our clients while there is a game with an abnormal loss 
3. Design an inquiry system to support fast, flexible and real-time updating queries for huge data.
   - querying for about 50 million rows of data to get statistics only takes 100 milliseconds.
   - querying for about 50 million rows of data with ordered output only takes 2 seconds.
   
4. Build a data pipeline system base on Kafka and Golang service to Extract-Transform-Load(ETL) data automatically. (we have 12 gaming platforms on production)
   - average handling events about 5000~8000 rows/sec for single platform
   - average bytes in and bytes out on system about 5~10 mb/sec for single platform

Data Analyst at 早餐吃麥片 (Morning Shop)，2016 / 10 - 2018 / 01

• Skills: Python, MySQL, Git
• Highlight:
  
1. Use the Apriori algorithm to find the best combination of products and the sales of the new product set is 7 times more than the sales of the old one. 
   
2. Calculate repurchase rate for each product and find a strategy to increase members' repurchase rate 5%.
   
3. Build customer segmentation and VIP system to increase members' average purchase times from 1.43 to 1.74.
   
4. Based on the behavior of members, find the best time for app push and increase the conversion rate from avg. 1.7% to avg. 2.3%.
   
5. Calculate net promoter score (NPS), customer lifetime value (LTV) and cohort analysis to check the health of our eCommerce.
   

Intern at 台灣工銀證券 (IBT Securities)，2013 / 07 - 2013 / 09