Junย Choi
Senior Software Engineer at bunch
Berlin, Germany
Summary
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Top SchoolJun Choi is a senior software engineer based in Berlin with 5 years of backend-focused experience architecting high-performance systems and optimizing RDBMS queries and indexes. He has engineered scalable, event-driven architectures and media pipelines, delivering resilient solutions on AWS for both enterprise and streaming workloads. At CIETY, he implemented an asynchronous, at-least-once message delivery system using SNS/SQS, modularized Terraform to reduce deployment errors by 80%, and achieved over 90% message handling success with dead-letter queues. At Yanolja, he boosted ad relevance by 25%, cut data retrieval times by 40% through MySQL index tuning, and introduced functional programming and DI practices to improve code quality and maintainability. He has mentored developers and contributed to education initiatives, including a Node.js curriculum at wecode and hands-on coaching for aspiring engineers. He holds an MEng in Information Technology and a BE in Computer Systems Networking and Telecommunications from Korea Aerospace University, underscoring a strong formal foundation paired with practical production delivery.
5 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 (45)
sql-query10
javascript10
node-js10
sqlite10
query-builder10
cockroachdb10
postgresql10
mysql10
mariadb10
postgres10
mongo10
prisma10
sql-server10
orm10
mssql10
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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