We are seeking a Senior Machine Learning Engineer to join our AI Platform team. As a Senior Machine Learning Engineer, you will be responsible for building and maintaining the cutting-edge systems that power AI at Roblox. You will focus on one of three high-impact tracks: AI Platform Projects, Distributed Inference & Systems Optimization, or Information Retrieval & RAG for Gen AI.

What you'll do

• Pioneer next-generation AI tooling to enhance the efficiency, cost, and usability of ML@Roblox.
• Build and maintain core platform components: Serving Layer, Model Registry, Pipeline Orchestrator, and Training/Inference control planes.
• Design great developer experiences (paved-road templates, tooling, visualizations) to reduce time-to-production and ensure foundational AI systems are scalable and reliable.

What you need

• Possessing or pursuing a Ph.D. in Computer Science, Computer Engineering, Mathematics, Statistics, or a related technical field, with a thesis aligned to Roblox’s research areas.
• Experience with high performance distributed systems, ML Infrastructure, LLM fine tuning/RL, Information Retrieval and Gen AI context generation.