Jun Choi
Senior Software Engineer at bunch
Berlin, Germany
Summary
👤
Senior🎓
Top SchoolJun Choi is a Senior Software Engineer based in Berlin with six years of hands-on experience designing high-performance backend systems, optimizing RDBMS queries and indexes, and building event-driven architectures on AWS. He has a strong track record improving API latency and scalability—delivering multi-threaded message systems with SNS/SQS, implementing idempotent retry strategies, and modularizing Terraform to reduce deployment errors. Jun blends engineering with mentorship, having guided 300+ aspiring backend developers in functional TypeScript and Nest.js while also simplifying legacy codebases through functional patterns and DI. His work spans low-latency video streaming, reliable push notification systems, and ad-serving platforms where index tuning and query redesign cut response times dramatically. Comfortable across the stack from infra to database design, he brings a pragmatic focus on measurable outcomes—faster responses, lower costs, and higher delivery success rates.
6 years of coding experience
3 years of employment as a software developer
Master of Engineering - MEng, Information Technology, Master of Engineering - MEng, Information Technology at Korea Aerospace University
English, German, Korean
Github Skills (40)
sql-query10
javascript10
sqlite10
postgresql10
query-builder10
cockroachdb10
mysql10
mariadb10
prisma10
sql-server10
orm10
mssql10
orm-library10
unit-of-work10
nodejs10
Programming languages (6)
Github contributions (5)
wechicken/wechicken-backend-2
Jul 2021 - May 2022
Contributions:17 reviews, 40 commits, 32 PRs in 9 months
Jun4928/posts
May 2020 - Apr 2024
Contributions:88 pushes, 1 branch in 3 years 11 months
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