Marshall Roch
UI Engineer at Meta
United States
Summary
🤩
Rockstar🎓
Top SchoolMarshall Roch is a UI Engineer with 15 years of experience building reliable, developer-facing tools and polished front-ends at Meta and across high-profile open-source projects. He blends deep language and systems knowledge—from JavaScript, Ruby, and PHP to OCaml and C—with a human-computer interaction background (BS/MS from Carnegie Mellon) to improve both usability and type safety. His contributions to flagship projects like React, React Native, Flow, Metro, Relay and the Flow VS Code extension show a rare full-stack fluency: shipping UX improvements, refactors, type-system enhancements, and build/devops fixes. Comfortable moving between parser and AST work, bundler and build-system maintenance, and mobile UI modules, he routinely tackles thorny integration and tooling problems that improve developer productivity. Notably, he pairs pragmatic bug fixes with larger architectural edits—such as React context and Flow integrations—demonstrating an ability to modernize legacy code while preserving stability.
15 years of coding experience
5 years of employment as a software developer
BS, Computer Science, Human Computer Interaction, BS, Computer Science, Human Computer Interaction at Carnegie Mellon University
Stackoverflow
510reputation
9kreached
9answers
0questions
Github Skills (64)
javascript10
develop10
parser10
mobile-development10
flow-control10
type-check10
react-native10
hacking10
ide10
work-flow10
language-server-protocol10
ui-design10
vscode-extension10
hhvm10
typechecker10
Programming languages (18)
Github contributions (5)
facebook/flow
Feb 2015 - Jan 2023
Adds static typing to JavaScript to improve developer productivity and code quality.
Role in this project:
Back-end & Language Infrastructure Engineer
Back-end & Language Infrastructure EngineerContributions:3 releases, 13 reviews, 3560 commits in 8 years
Contributions summary:Marshall primarily contributed to the development and maintenance of the Flow type checker, as evidenced by modifications to the parser, AST mappers, and code action functionalities. Their work focused on improving the accuracy and reliability of the type system, including fixing parsing errors and handling inconsistencies in various code constructs. The user also worked on adding new features related to autocompletion, such as sorting and handling more complex code scenarios.
javascriptstatic-typing
flow/flow-for-vscode
Sep 2021 - Jan 2023
Flow for Visual Studio Code
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:7 releases, 1 review, 28 commits in 1 year 4 months
Contributions summary:Marshall primarily contributed to the Flow for VS Code extension, focusing on improving its functionality and reliability. Their work included fixing flow-bin verification on Windows, removing the legacy non-LSP implementation, removing a deprecated configuration option, and upgrading the bundled node version. They also upgraded the extension's build process by upgrading rollup, and they addressed a security concern related to logging by disabling a specific option.
visual-studio-code
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