Pinglei Guo
March 2025 - Present Software Engineer Weight & Biases by CoreWeave, Remote, Canada
Sep. 2020 - Mar. 2025 Software Engineer at AWS, Vancouver, BC, Canada
Dec. 2019 - Sep. 2020
May 2019 - Nov. 2019 Software Engineer at Google, Sunnyvale, CA
May 2018 - May 2019 Software Engineer at PayPal, San Jose, CA
Sep. 2016 - Mar. 2018 MS Computer Science, University of California Santa Cruz (UCSC)
Nov. 2012 - June 2016 BS Material Science, Shanghai Jiao Tong University (SJTU)
I am working at Weight & Biases on models. Previously I worked at AWS CloudWatch on distributed tracing. Before that I worked at Google and PayPal on container and Kubernetes. I got my master degree in UCSC and bachelor degree in SJTU. My main (research) interests are time series database (see Xephon) and database benchmark (see BenchHub). I also maintain some Go libraries (see gommon) and am working on a DSL (see Reika). I spend most of my free time on GitHub, reinventing wheels.
During my two years at UCSC. I did three things, wrote gommon, built Xephon, designed BenchHub as my master thesis. Xephon includes course projects for all my system and programming language related courses in UCSC (CMPS232, CMPS278, CMPS229, CMPS203, CMPS253). Xephon-B is a benchmark suite. Xephon-K is a multi-backend time series database with its own columnar storage engine. Reika is a DSL for time series database started in Xephon.
I was a fullstack web developer and former president of Dongyue Web Studio, where students build web and mobile applications. I led the development of Tongqu for 2 years. Tongqu is an online campus event platform that had thousands of users and tackled high concurrency problem with limited hardware resource (another way of saying limited funding from school).
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GitCafe is the first git hosting company in China, focusing on enterprise and education. It is now acquired by Coding.net. I met Rainux and Simsicon at the Hackshanghai hackathon during a road show and got an internship opportunity. I worked as a Ruby engineer in Beijing during winter vacation. I closed many tickets. My knowledge of Git itself and Git workflow increased significantly since GitCafe is a git hosting company.
Following are my contributions related to GitCafe
Dongyue Web Studio is formed by students from Shanghai Jiao Tong University. Most of them are undergraduate students major in computer science and information security. It's the place where I started to learn real programming. Unlike course projects, I got chance to collaborate with experienced senior students and hear lectures from alumni working at Google and Microsoft. The product we developed is used by thousands of students in the campus and we also help startups to build their prototypes. I took an active part in the studio, though I majored in Material Science, my efforts helped me stand out and I ended up becoming the president of the studio. (The true reason is those better than me chose to spend the time in lab or with their SO)
Major contributions to Dongyue Web Studio
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| Language | Go, Java, Rust, C++, JavaScript, PHP, Python, SQL, Scala |
| Database | Cassandra, Solr, MySQL, Redis, TSDB |
| DevOps | Kubernetes, Docker, Mesos, Terraform, Vagrant |
| Framework | Angular, Laravel, Spring, Dropwizard, Express, Rails, CUDA, Hadoop |