About

Qiunan Liu is a highly skilled Sr. Software Engineer at LinkedIn with over 5 years of relevant experience. He holds a Master's degree in Electrical and Computer Engineering from Carnegie Mellon University and is a CFA Level II Candidate. Qiunan is an expert in back-end web application development and has a strong command over Java, Spring boot, and RESTful web services. He has worked on a variety of projects throughout his career, including Wallet Events Stream Application and Transaction History Service, both of which were developed for ApplePay Services Team at Visa. At Transaction History Service, Qiunan developed a RESTful web service from scratch, which is a key component of VISA Apply Pay Service Global and Localization. He also integrated security protocols like SSL, ESI/WSI routing, LDAP Authentication, and set up firewalls. Qiunan's contribution to all levels of testing, from unit testing to end-to-end testing, has resulted in the delivery of high-quality code. Qiunan has also leveraged Kafka and modern distributed Hazelcast caching solutions to achieve high performance, supporting more than 3,500 TPS peak volume and reducing 50% network overhead of the current solution in production. He also supported application migration from Virtual Machine to Containers, achieving high scalability and significantly reducing CPU usage and downtime. In addition to his professional experience, Qiunan has also completed a Summer School program at the University of California, Los Angeles. His technical skills include Software Engineering, Web Development, Test Automation, Kafka, and Integration. Overall, Qiunan is a highly skilled and experienced software engineer with a proven track record of delivering high-quality code and developing complex back-end web applications.