As a Principal Frontend Engineer on the Co-Experience team, you will drive mission-critical initiatives that define the future of communication. 

Our flagship product is the platform-level Party System: the heartbeat of social interaction on Roblox, enabling users to form groups and stay connected across servers and experiences. We have strong foundations, but we're accelerating toward product-market fit and need a principal who delivers.

Your scope extends beyond Party to the full Communication surface — chat, voice, video, and future formats we haven't built yet, across both traditional UI and immersive 3D environments. You'll design the systems and APIs that let Roblox creators add rich social features to their own experiences, shaping how an entire generation communicates through play.

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.Deep systems-level audio or video expertise.
• You have a history of tackling hard problems, e.g. performance and memory optimization, streaming, rendering, buffer pooling.
• You are comfortable diving into complex, low-level client codebases.
• End-to-end social product delivery. You have led user-facing social or communication products.
• 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 where you stop building.
• An AI advocate: You actively push the boundaries of AI-assisted development for yourself and your team.
• Continuously growing: You take pride in your craft and hold yourself to a higher standard each quarter.