Senior Software Engineer - Marketplace Foundation

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. What You’ll Do: As a Senior Backend Engineer on the Avatar Marketplace team, you will be building an international marketplace for millions of virtual items that users acquire to customize their avatars and identities on the Roblox platform. You will design, implement, and operate the frameworks and services you and the team build that help control the supply and demand of the Roblox economy. The team is responsible for building systems that will help content creators become more successful sellers. With millions of users, we are looking for an experienced engineer who is passionate about designing and building scalable systems for both sides of the marketplace. The Marketplace Foundation team's focus is to provide reliable and scalable solutions for critical systems supporting both Avatar Marketplace creators and users. We aim to invent new and evolve existing core concepts to support new and future use cases in a holistic manner, such as Bundles, Limiteds, and Price Optimization. We help the creators to improve their earning while scaling Roblox's economy. The team is also responsible for ensuring 10x scalability headroom on critical Marketplace systems, improving the efficiency, enhancing fault tolerance and decreasing the number and time to resolution of production customer support tickets related to these systems. You will: Design and architect scalable, reliable, and fault-tolerant distributed systems, including microservices, message queuing systems, distributed databases, and cloud-based solutions. Implement high-quality and dependable code with thorough unit and integration tests. Develop backend systems to ensure the seamless and efficient operation of our services. Troubleshoot and resolve intricate technical issues within distributed systems. Optimize system performance, minimize latency, and maximize throughput. Collaborate effectively with cross-functional teams, including product managers, research scientists, and other engineering teams. Mentor and guide junior engineers, fostering continuous learning and professional development. Actively participate in code reviews, architectural discussions, and technical design sessions. Establish and advocate for best practices throughout the software development lifecycle. You Have: 6+ years of professional experience in software development, with a significant focus on distributed systems. A deep understanding of core distributed systems concepts, including the CAP theorem, consistency models, concurrency control, fault tolerance, and consensus algorithms (Paxos, Raft, PBFT). Proficiency in one or more systems programming languages such as C#, Go, Rust, Java, C++, or Python. Strong practical experience with containerization (Docker) and orchestration tools (Kubernetes, Terraform, Helm). Experience with big data technologies such as Hadoop, Spark, and Kafka, and distributed databases like Cassandra and MongoDB. Familiarity with monitoring and observability tools such as Grafana, Datadog, Prometheus, and the ELK stack. Strong analytical and problem-solving abilities, with a proactive approach to identifying and resolving complex challenges. Experience defining technical vision and providing technical leadersh