Jongsun Suh
Senior Software Engineer II at MetaMask
New York, New York, United States
Summary
🤩
Rockstar🎓
Top SchoolJongsun Suh is a Senior Software Engineer II based in New York with eight years of experience specializing in TypeScript, React/Node.js full-stack development, and type-safe architecture. At MetaMask he has driven large-scale refactors and performance work—reducing startup costs, migrating hundreds of Redux selectors to TypeScript, and cutting unnecessary runtime work across a 15k+ LoC surface. He champions pragmatic type safety (authoring org-wide TypeScript style guidance and slashing "any" usage) and builds developer tooling and AST scripts to automate tedious migrations. An active open-source contributor, he improves TypeScript type-challenge test suites and contributes full-stack work to tooling like Swell for streaming API testing. Trained originally in economics and quantitative analysis, he brings a data-informed mindset to engineering tradeoffs and a creative, collaborative approach inspired by music and film.
8 years of coding experience
1 year of employment as a software developer
Bachelor of Arts, Economics, Bachelor of Arts, Economics at Seoul National UniversityDaewon Foreign Language High School
Korean, Japanese, Chinese
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (17)
javascript10
testing10
typescript10
ch10
type-system10
typescript-types10
typescripts10
react10
wpgraphql9
wordpress-graphql9
api9
openapi9
graphql9
eslint8
websocket7
Programming languages (4)
Github contributions (5)
open-source-labs/Swell
Jul 2021 - Aug 2021
Swell: API development tool that enables developers to test endpoints served over streaming technologies including Server-Sent Events (SSE), WebSockets, HTTP2, GraphQL, gRPC, and tRPC..
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:1 review, 35 commits, 4 PRs in 22 days
Contributions summary:Jongsun primarily worked on the Swell project, contributing to both the frontend and backend aspects of the API development tool. Their commits show a focus on improving the user interface, updating import statements, and merging branches, indicating involvement in feature integration and overall project maintenance. The user also made changes related to build configurations and linting rules, demonstrating a familiarity with project setup and code quality standards. Furthermore, they worked on functionality related to GraphQL and Open API integrations.
grpcendpointsendpointswellmonitoring
type-challenges/type-challenges
Jan 2023 - Jan 2023
Collection of TypeScript type challenges with online judge
Role in this project:QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:5 commits, 5 PRs, 9 comments in 3 days
Contributions summary:Jongsun contributed primarily to the test suite of the `type-challenges/type-challenges` repository. Their work involved fixing false negatives in existing test cases, ensuring the accuracy of type challenges. They added new test cases to cover edge cases and larger inputs, improving the robustness of the type-checking exercises. This activity focused on verifying the correct behavior of TypeScript type definitions.
online-judgelodashtype-systemutilitiestypescript
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