Senior ML Infrastructure Engineer — Text Safety & Moderation

Requirements

• 5+ years of experience designing, building, and deploying large-scale machine learning systems in production environments
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• A graduate degree or equivalent experience in Computer Science, Engineering, or a related technical field
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• Strong communication skills and a collaborative, solution-oriented approach to problem solving
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• Hands-on experience with fine-tuning VLMs, LLMs, or large multimodal models to improve model quality, safety, and performance is a plus
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• Data & System Oriented:
  You understand that robust data and systems are the foundation of any production applications, and you design infrastructure for scale, correctness, and reliability
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• Collaborative:
  You thrive in cross-functional teams, partnering effectively with Product and Engineering to solve complex challenges
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• Curious & Creative:
  You enjoy tackling hard problems, exploring new technologies, and driving continuous improvements in both systems and workflows
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• Impact Driven:
  You focus on outcomes - prioritizing product impact, reliability, and measurable success over code volume or complexity

• As a Senior Engineer you will play a key role in advancing large-scale AI systems that strengthen text safety and integrity
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• You’ll leverage cutting-edge ML models to build intelligent tools to curate high-quality training and evaluation data to train machine learning models
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• These systems will continuously refine and enhance model performance, enabling proactive detection and mitigation of safety risks across the platform in real time
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• In this role, you’ll work closely with cross-functional teams of engineers, product managers, policy experts, and safety specialists to turn complex safety challenges into scalable, impactful solutions
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• You’ll establish best practices and technical standards that define the next generation of safety AI, ensuring the platform remains secure, inclusive, and resilient
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• Your contributions will directly empower robust, AI-driven moderation and detection systems that foster a safe and positive experience for all users
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• Design, build, and own critical components of the AI based text safety components, with a focus on usability, reliability, scalability, and performance
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• Implement robust AI service to ensure text quality on all Roblox properties (Avatar, Game Description etc.)
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• Advance our AI systems infrastructure by developing strong frameworks and APIs to support the text filtering needs for hundreds of clients in Roblox
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• Partner with cross-functional teams of engineers, product managers, policy experts, and safety specialists to to deliver scalable data and AI solutions to power next-generation safety systems
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• Develop text safety quality metrics and eval tooling to support the continued quality iteration over time
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• Stay current with emerging technologies and push forward innovation in AI space to enhance user and platform safety