Staff Software Engineer, AmazingTalker  Mar. 2021 – present

• Responsible for an infrastructure migration plan. Include cloud service, database, programming language, and framework research.
•  Providing a service template allows developers to copy the Github repository to build a new service/cronjob in our Kubernetes. Include code generator, repository structure, CI/CD, and helm-charts templates.
  
• Contribute and lead our backend code base from 0 to 1. Include internal Golang packages that integrate with the service template. The template provides completed features like in-memory cache, Redis cache, metric integrated with NewRelic, monitoring, logger, database connection pool
  
• Lead into IaC within pulumi, starting from our complex CDN and IAM management. Now, most of AmazingTalker's infrastructure resources are in Github code management.
  
• Building the hiring process, start the engineer-level policy draft delivered by our CTO, interview assessment, and interview questions.
  

Backend developer, Dcard,  Jun. 2017 – Feb. 2021

• Support data-team built data pipeline and data center for our home page recommendation system.
• Implemented dictionary compression utility for a high writing-load database with a 95% compression rate and 60% insert speed improvement.
  
• Improved Elasticsearch performance and conducted new query implementation. Rewrote index mapping; as a result, the new index was reduced by 40%, allowing us to build an auto-reindex trigger.
• Created the Node.js service template and CloudFlare worker’s template. Provided a quick and easy environment for developers.
• Added or removed indices and materialised view for our PostgreSQL. Improved query performance. Reduced API response time to 400ms.
• Analyse and optimise multi-layer cache, including service internal local cache, Redis cache, CDN, and CDN internal worker.
• Constructed a dynamic server-side rule-based configuration service that now handles at least 100 different rules.
• Developed a subscription feed service that handles thousands of new posts every hour and feeds to millions of subscribers.
• Cooperated directly and efficiently with the sales department. Responsible for the scheduled ticketing system, check-in system, real-time participant calculations, and activity website. Developed a highly successful offline activity with the sales team, attracting over 10,000 participants.
• Established a ticketing and gift delivery service, which handled 15,000 draw requests per minute at the peak time. More than ten thousands gift delivery campaigns were processed.
• Responsible for advertisement system, e-commerce service (including the checkout process, in-stock management, and all web pages), and advertising post scheduling system.

Fandora Shop, Backend developer intern, 2015 Dec - 2016 Sep