Seojin Han
SSoftware Engineer at Rakuten · Developer tools
- Rakuten
- Seoul, South Korea · KST (UTC+9)
- 1+ years experience
- Yonsei University
- English, Korean
Messaging unavailable
Overview
Based in Seoul. I work on developer tools at Rakuten. Grew the developer experience team from 5 to 32 engineers. I mentor students through university programmes.
Good reasons to reach out
- Second opinions on TypeScript decisions
- Working sessions on CLI design
- Thoughtful intros to people in my field
Please don't message about
- SEO and link-building offers
- Requests to fix your code for free
- Offshore staffing offers
Best reached early in the week
Skills
TypeScriptVS Code extensionsCLI designLSPcompilersRust
Experience
- Software EngineerOct 2025 - PresentRakuten · 1 yr · Full-time · Seoul, South Korea
- Cut p99 latency on the developer experience services from 682ms to 146ms.
- Shipped a rewrite that took build times from 42 minutes to under 4.
- Moved 76% of developer experience traffic off a legacy monolith without a customer-facing incident.
References
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Education
- Yonsei UniversityBA, Computer Science2021 - 2025
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