Seonย Kim
Software Engineer at Toss Securities
Seoul, South Korea
Summary
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Top SchoolSeon Kim is a backend software engineer based in Seoul with five years of experience building and operating high-traffic fintech systems. At Toss Securities he helped architect services that scale from 1K to 40K TPS, built real-time ranking and complex stock screening engines, and implemented smart promotion and discovery features. He has strong open-source credentials, contributing server-side improvements to Armeria (a widely used microservice framework from the Netty creators) and expanding SQL-compatible functions for the Turso/Limbo project. Comfortable across Java, Rust-adjacent database work, Elasticsearch and Kubernetes ecosystems, he blends production-grade reliability with hands-on systems and database engineering. An uncommon background in aviation management (Summa Cum Laude) underscores his methodical, operations-minded approach to building resilient financial services.
5 years of coding experience
2 years of employment as a software developer
Bachelor's degree, Aviation/Airway Management and Operations, Summa Cum Laude, Bachelor's degree, Aviation/Airway Management and Operations, Summa Cum Laude at Hanseo University
English, Korean, Chinese
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (23)
strings10
sqlfunction10
text-manipulation10
http10
java10
javas10
exception-handling10
sql10
database-design10
logging10
rust10
server10
grpc10
server-side10
netty9
Programming languages (6)
Github contributions (5)
tursodatabase/limbo
Jul 2024 - Mar 2025
Limbo is a project to build the modern evolution of SQLite.
Role in this project:
Back-end Developer & Database Engineer
Back-end Developer & Database EngineerContributions:28 reviews, 71 PRs, 67 comments in 7 months
Contributions summary:Seon focused on implementing and enhancing database-related functionalities within the Limbo project. Their work included adding support for string manipulation functions like `substr` and `concat_ws`, and more SQL functions such as `ifnull`, `nullif`, and `sqlite_version`, demonstrating efforts to broaden the SQL feature set. These contributions involved modifying core files related to the virtual database engine and expression translation, as well as adding necessary supporting code for each function.
databaseembedded-databasesqlsqlite3webassembly
line/armeria
Jun 2022 - Jul 2024
Your go-to microservice framework for any situation, from the creator of Netty et al. You can build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard.
Role in this project:Back-end Developer
Back-end DeveloperContributions:205 reviews, 18 PRs, 283 comments in 2 years 1 month
Contributions summary:Seon primarily focused on improving the Armeria framework by addressing issues related to server-side exception handling and logging. They added an `ExceptionReportingServerErrorHandler` to report unhandled exceptions and fixed a bug in the javadocs related to endpoint selection. Furthermore, the user implemented features to allow masking sensitive headers in request logs using `HeadersSanitizer` and enhanced CORS functionalities with regex and predicate matching.
rpcmicro-frameworkretrofitprotobuftype-of
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