Senior Software Engineer (Foundation & Luau Platform)
Posted Updated
Summary
Senior Software Engineer to build and maintain Roblox's shared UI platform (Foundation & Luau), including component libraries, server-driven UI, navigation, and core frameworks using Luau and React-style frameworks. Focus on performance, cross-platform consistency, and enabling product teams.
- The Foundation and Luau Platform team builds the shared platform that Roblox’s user interface runs on. Our UI is written in Luau, Roblox’s scripting language, using React-style frameworks. We own the core pieces that product teams across Roblox rely on: a component library used across Roblox’s apps and tools, server-driven UI, the core app frame and navigation, and the frameworks and libraries underneath them
- Our goal is to make that platform fast, consistent, and reliable for the engineers who build on it. As a Senior Software Engineer, you will help shape and build it, working across systems, platforms, and infrastructure
- Design and build the frameworks and APIs that Roblox’s UI is built on, including layout and navigation systems, server-driven UI, and a shared component library
- Build and evolve the core systems beneath the UI, such as navigation, routing, state management, and data flow, so features load quickly and behave consistently
- Drive startup performance, transition smoothness, and layout stability across the client on phones, tablets, and desktop, using traces and telemetry to set measurable quality bars
- Roll out platform changes safely at scale, using feature flags, staged rollouts, and side-by-side validation of old and new implementations, with fast rollback when needed
- Drive adoption of the platform across Roblox by partnering with product, design, and feature engineering teams to guide them onto our frameworks and components, and turning their feedback into a better platform
- Raise the quality bar through thoughtful code review, strong test coverage, and clear documentation, and mentor other engineers
- 4+ years of professional experience building and shipping client applications, ideally on mobile (iOS, Android) or desktop, with a strong foundation in application architecture
- Experience designing shared frameworks, UI platforms, or core libraries that other engineers build on
- A solid understanding of client rendering and layout performance across multiple screen sizes, form factors, and orientations
- Strong hands-on experience with React and a solid understanding of how it works, including its component model, state management, and rendering behavior, ideally in an application setting such as React Native rather than purely web
- Comfort working in a large, evolving codebase and migrating legacy code incrementally
- Strong debugging and profiling skills, with experience diagnosing performance issues such as slow startup, visual stutter, and memory pressure
- Strong written and verbal communication skills, and the ability to align multiple teams around a technical plan
- Experience with feature flagging, staged rollouts, and experiment-driven launches
- Experience with Luau or Lua
- Experience with React Navigation or comparable routing libraries
- Experience with native mobile development on iOS or Android
- Experience with server-driven UI or dynamic UI delivery systems
- Experience building cross-platform applications that run on mobile, desktop, and console
- Experience supporting other engineers in adopting a shared platform, through documentation, migration guides, or direct developer support