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Distinguished Engineer, Machine Learning Systems - Discovery

Roblox · San Mateo, CA, United States

onsiteunknown$419,390–$419,390Posted Sep 25, 2026machine learningsearchrecommendation systemstransformersLLMsembeddingstraining infrastructuremodel serving

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About this role

**Every day, tens of millions of people come to Roblox to explore, create, play, learn, and connect with friends in 3D immersive digital experiences—built 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 they can imagine to life. Our vision is to reimagine how people come together—from anywhere in the world, on any device. We’re on a mission to connect a billion people with optimism and civility, and we’re looking for amazing talent to help us get there. --- ## Role Overview As a **Distinguished Engineer / Technical Director on Discovery**, you’ll own the overall technical vision and execution for **all machine learning initiatives across Search and Discovery teams**. The mission of these teams is to connect a billion users with the best connections and content at the right time, across a diverse range of search and recommendation problems at high scale—fundamental to personalizing the Roblox experience and driving engagement and retention. --- ## You Will - Own the technical direction and implementation for ML solutions powering **search and recommendation systems**, driving Roblox content distribution. - Author specs for new features and improvements—setting AI strategy and pushing the frontier across **candidate generation, ranking, objective functions, and value delivery** for both users and developers. - Build and evolve infrastructure for **training, serving, and evaluating** traditional ML models and **Generative AI models** (e.g., embedding-based retrieval, transformers, LLM-based workflows). - Co-design models and systems at the intersection of **model architecture and infrastructure**, partnering closely with core modelers, data/AI infrastructure engineers, and product teams to push large-scale training and serving. - Lead other engineers by example through technical direction as an individual contributor, and help build an engineering culture of excellence. - Become an authority on the technology stack and ensure new solutions are built the right way. - Collaborate with other Roblox teams to build products with a **community- and company-first** mindset. - Balance researching new technologies with practical execution to bring research into Roblox products. - Collaborate with industry and communities where applicable and serve as an ambassador for Roblox. --- ## You Have - **10+ years** of experience with a consistent record delivering and improving **large-scale search and recommendation systems**. - Experience crafting and building large-scale ML models with **billions of parameters**, and launching them into production. - Ability to break down long-term product requirements into iterative, deliverable stages. - Experience initiating and facilitating challenging technical decisions across multiple teams and organizations; empathetic and able to build shared understanding. - Deep technical expertise with a user-first mindset (Roblox users and internal engineers). - A generalist approach with mastery of multiple languages/technologies; able to adapt quickly. - Ability to roll up your sleeves to tackle data and ML problems as they arise. - Creative and strategic approach to hard problems—simplifying the complex and bringing fresh ideas from new places. - **BS in Computer Science or related**; **MS/PhD** is a plus. --- ## Location / Work Schedule Roles based at Roblox headquarters in **San Mateo, CA** are **onsite

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