Principal Software Engineer, Economy ML (Backend)

The Economy ML team is building the machine learning backbone that powers Roblox’s Marketplace, Developer Monetization, and Payments ecosystems. From intelligent pricing and personalized storefronts to dynamic layout optimization and avatar understanding, we’re reimagining how the Roblox economy drives user engagement, monetization, and creator success at scale.

As a Principal Software Engineer, you will architect, build and deploy high-scale, reliable backend and data systems for personalization, search and recommendation across various product surfaces in Marketplace, Developer Monetization and Payments. You will be involved in key projects such serving heterogeneous content recommendation for whole page construction, making our real-time feature serving more flexible and reliable, enabling exploration and multi-armed bandit learning, and scaling our systems to support a very large corpus. 

You Will

• Design and build the systems that powers content recommendation, search and personalization across Economy product surfaces.
• Lead the implementation of our backend and data infrastructure and mentor the Economy ML backend engineering team.
• Collaborate with partner and platform teams across Roblox to make sure we are building products with a community first approach.
• Research and leverage industry-leading practices while making product impact.

You Have

• 8+ years of experience as a backend engineer in search, recommendation, advertising or personalization systems.
• Experience in building and scaling high-scale distributed systems.
• Experience with real-time stream processing, feature stores and other machine learning infrastructure (exposure to GPU inferencing and deep learning frameworks is a big plus).
• Ability to design and architect systems for personalization and related domains.

You Are

• A Technical Leader: You have initiated and facilitated challenging technical solutions. Your technical expertise influences product direction. You nurture a culture of technical excellence.
• Versatile: You're a generalist and you are comfortable with several languages and technologies already; you are adaptable in any situation. You are resourceful, and take a creative and strategic approach to solving hard problems.
• Analytical: Excited to investigate large, ambiguous problems, and quantify the problems and the solutions.
• User Oriented: You always start with the needs of the user, whether they are Roblox users or internal engineers before architecting a solution.
• Team Oriented: You lift up your peers and find ways to make the team stronger.

Why Economy ML @ Roblox?

• Cross-surface impact: Your work will influence virtual item recommendations, Robux pricing, page layout, avatar generation, and more.
• Scalable infrastructure: Build on top of Roblox’s ML Platform to accelerate experimentation and deployment.
• High-leverage mission: Directly contribute to key growth levers: retention, engagement, monetization, and creator success.
• Flexible structure: Work in a fluid pod model, allocating effort to the most strategic initiatives without rigid silos.