Senior Backend Software Engineer (Co-Experience)

• As a Senior Software Engineer (Backend) on the Co-Experience team, you will work on high-visibility initiatives that define the future of age-appropriate communication
• You will build and maintain the services behind a social ecosystem that keeps interactions safe, civil, and meaningful across diverse age groups
• We are kind, highly collaborative, and draw on a mix of startup and large company backgrounds to iterate faster within Roblox
• Our primary product is a platform-level Party System. As the heartbeat of social interaction on Roblox, this system enables users to coordinate, form groups, and stay connected as they navigate across servers and immersive experiences
• We already have a strong foundation of chat, private gameplay, gameplay mechanics, and creator APIs
• We need your expertise to strengthen the backend infrastructure underneath it, build out new features, and accelerate our path toward product-market fit. As we scale, your work will directly impact our global community and support the company’s top-line growth
• Collaborate within a cross-functional team that includes product, design, UXR, frontend and backend engineering
• 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
• Maintain, improve and scale the Roblox party system to support millions of concurrent users, with a safety-first mindset
• Partner with other engineering teams (matchmaking, recommendations, voice, economy) to integrate multiple systems in a reusable, performant and safe manner, working through alignment challenges autonomously
• Uphold high quality standards while iterating on features with live production traffic, and resolve escalations within your team
• Raise the team’s technical bar and accelerate the productivity of junior engineers

The ability to author a clear, actionable technical design document that aligns stakeholders and holds up in architectural reviewProduct-opinionated: You don’t just execute plans, you proactively shape our roadmap, and push for the right product outcomes5+ years of experience working on microservice architectures, with a proven track record in addressing scalability and reliability challenges (4+ years with a graduate degree in computer science or a related field)An AI advocate: You actively push the boundaries of AI-assisted development, for yourself and for your teamAll-round: You’re a generalist, open to learning new languages and technologies, and drawn to the parts of the system you haven’t worked on yetContinuously growing: You take pride in your craft and hold yourself to a higher standard each quarterStrong understanding of server-side development and design principles, with proficiency in at least one compiled language such as C#, C++, Java, Golang, or otherKind 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 enough3+ years of experience building systems behind consumer-facing APIs that handle large numbers of concurrent usersA track record of leveraging AI-assisted development tools to maximize engineering velocity, allowing you to navigate large codebases, iterate on complex logic, and move from idea to production-ready code with high efficiency