Kai Pei
Senior Software Engineer at Sezzle
Austin, Texas Metropolitan Area United States
Summary
👤
Senior🎓
Top SchoolKai Pei is a senior software engineer with eight years of experience building and scaling mission-critical backend systems, having joined Sezzle as the 9th employee in 2017 and helped evolve its payments and checkout infrastructure from thousands to tens of millions of requests per day. With a BA in Mathematics and Computer Science from Carleton College, Kai brings a strong theoretical background—especially in combinatorics, graph theory, and abstract algebra—that informs pragmatic system design and algorithmic thinking. He has led teams and owned customer-facing and merchant APIs, balancing reliability, performance, and product needs in a high-growth startup environment. Based in Austin, Kai pairs hands-on engineering with long-term architectural thinking and a curious, interdisciplinary mindset, and outside of code he channels pattern-driven thinking into guitar, rhythm games, and hiking.
8 years of coding experience
7 years of employment as a software developer
Bachelor of Arts - BA Mathematics and Computer Science, Bachelor of Arts - BA Mathematics and Computer Science at Carleton College
Github Skills (10)
wsdl4
soap-client4
soap4
golang-server4
reader4
validation4
golang3
scheduling1
job-scheduling1
parser1
Programming languages (2)
Github contributions (5)
sezzle/ach
Oct 2017 - Jan 2019
ACH(Automated Clearing House) GoLang library implementing NACHA file creation and validation via reader and writer
Contributions:8 commits, 12 PRs, 6 pushes in 1 year 3 months
golanggolang-libraryhousefile-creationvalidation
sezzle/goat
Jun 2018 - Aug 2019
generate soap requests for Go at runtime
Contributions:3 PRs, 5 pushes, 2 branches in 1 year 2 months
golangruntimesoapwsdlsoap-client
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