Principal Frontend Engineer, Co-Experience

Every day, tens of millions of people come to Roblox to explore, create, play, learn, and connect with friends in 3D immersive digital experiences– all created by our global community of developers and creators. At Roblox, we’re building the tools and platform that empower our community to bring any experience that they can imagine to life. Our vision is to reimagine the way people come together, from anywhere in the world, and on any device. We’re on a mission to connect a billion people with optimism and civility, and looking for amazing talent to help us get there. A career at Roblox means you’ll be working to shape the future of human interaction, solving unique technical challenges at scale, and helping to create safer, more civil shared experiences for everyone. As a Principal Frontend Engineer on the Co-Experience team, you'll define how hundreds of millions of Roblox users talk, hang out, and stay connected. If you've shipped consumer real-time audio/video calling — and you understand the reliability, latency, and trust constraints that come with it — this is your chance to bring that craft to a product unlike any other. Our flagship surface is the platform-level Party System: the heartbeat of social interaction on Roblox, where users form groups and stay together across servers and games. Our technical foundations are strong; we're accelerating toward product-market fit and need a principal who delivers. Your scope will span the full Communication surface — chat, voice, video — and formats we haven't built yet, across both traditional UI and immersive 3D environments. You'll shape the systems and APIs that let Roblox creators add rich social features to their own worlds, and lead technical strategy across multiple pods to bring it all together. You Will Lead with empathy and invest in the people around you. Mentor and grow senior engineers, remove roadblocks for your teammates, and cultivate an environment where everyone can do their best work. Shape the frontend engineering culture across the Communication team. Your influence extends beyond your immediate pod to improve how we build, review, and ship software across the entire org. Act as the technical lead for cross-functional initiatives. Collaborate across multiple pods alongside product, design and both frontend and backend engineers. Take end-to-end ownership of projects. Drive initiatives from the creation of comprehensive technical plans and architecture through to successful launch, iteration, and measurable impact. Remain hands-on in the codebase. Our principal engineers actively develop the platform and review the code. Design empowering systems. Build architectures that enable Roblox creators to unlock entirely new forms of co-experience for their users. You Have 8+ years of frontend or client engineering experience (11+ years without a CS or related degree), with a focus on building complex UIs and partnering closely with Product and Design. Real-time calling product expertise. You have led consumer audio/video calling experiences at scale — think WhatsApp, Google Meet, FaceTime, Discord, or similar. Leveraged AI for high-velocity execution. You have used AI-assisted development tools to accelerate prototyping, iterate quickly, and drive concepts to production. Technical leadership. Proven experience mentoring and leveling up senior engineers into independent technical leaders. Robust system design skills. Demonstrated ability to author clear, actionable technical design docs that align stakeholders and hold up well in architectural reviews. You Are Kind and generous: You treat colleagues with respect, assume good intent, and go out of your way to help others succeed. You believe technical excellence without kindness is not enough. Product-opinionated: You don't just execute plans, you proactively shape our roadmap, and push for the right product outcomes. Hands-on: You write code, review code, and stay close to the product. You're not looking for a role