Distinguished Engineer, Economy ML | Roblox

Roblox’s Economy ML team delivers scalable machine learning systems for personalization, pricing, search, and content understanding across all Economy surfaces:
Marketplace, Developer Monetization, Payments, and Avatar. Roblox is looking for a Distinguished Engineer / Technical Director to lead the strategy and technical direction for these ML systems, with a focus on large-scale recommendations, infrastructure, and emerging Generative AI applications. You will help build systems for retrieval, ranking, generative modeling, and LLM-powered personalization at massive scale. The role calls for deep systems thinking, hands-on ML expertise, and a vision for how traditional ML and GenAI come together to power the future of the Roblox economy.

• AI/ML is a top company priority with long-term investment
• Real-world scale: millions of daily economic interactions across ranking, pricing, fraud, and search
• Full-system ownership, from data ingestion to GPU training to live inference
• Complex surfaces and rich signals, including 3D content, UGC, avatar metadata, and behavioral and economic signals
• The chance to shape the Roblox economy while working on frontier ML infrastructure and GenAI workflows

• Set the technical direction and implementation for the ML solutions behind core economy experiences: personalization, ranking, generative modeling, and more
• Write specs for new features and improvements, set the AI strategy, push the frontier of recommendation technology, and drive business outcomes across candidate generation, ranking, objective functions, and value delivery for users and developers
• Build and evolve infrastructure for training, serving, and evaluating both 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 with core modelers, data and AI infrastructure engineers, and product teams to push the limits of large-scale training and serving
• Lead other engineers by example and through technical direction as an individual contributor, building a culture of engineering excellence
• Become an authority on the technology stack and make sure new solutions are built the right way
• Work with other Roblox teams to build products with a community-and-company-first attitude
• Balance researching new technologies with a practical approach to turning research into Roblox products
• Engage with industry and communities where applicable, and act as an ambassador for Roblox

• 10+ years of experience, with a consistent record of delivering and improving large-scale search and recommendation systems
• Experience building and improving large-scale ML models with billions of parameters and launching them into production, with substantial contributions to ML infrastructure and production systems
  
  Ability to break down long-term product requirements into iterative, deliverable stages
• A record of starting and facilitating challenging technical decisions across multiple teams and organizations, with empathy and a knack for finding common understanding
• A first-principles approach that starts with the needs of the user, whether Roblox users and creators or internal engineers
• A generalist approach, with mastery of several languages and technologies and the ability to adapt to any situation
• Willingness to roll up your sleeves and tackle data or ML problems as they arise
• A creative, strategic approach to hard problems, simplifying complexity and bringing in fresh ideas
• BS in Computer Science or a related discipline

Technical Skills

• Large-scale search and recommendation systems
• ML model training, serving, and evaluation infrastructure
• Embedding-based retrieval, transformers, and LLM-based workflows
• Generative AI and personalization
• Ranking, candidate generation, and objective function design

Soft Skills

• Technical leadership and influence across teams
• Strategic thinking and simplifying complexity
• Empathy and consensus building
• Mentoring and fostering engineering excellence

• MS or PhD in Computer Science or a related discipline

• Equity compensation for all full-time employees
• Benefits for full-time employees, with details on Roblox’s careers page