Principal Machine Learning Engineer, Content & Communication Safety Job at Roblo

Every day, tens of millions of people come to Roblox to explore, create, play, learn, and connect with friends in 3D immersive digital experiences– all created 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 that they can imagine to life. Our vision is to reimagine the way people come together, from anywhere in the world, and on any device. We’re on a mission to connect a billion people with optimism and civility, and looking for amazing talent to help us get there. A career at Roblox means you’ll be working to shape the future of human interaction, solving unique technical challenges at scale, and helping to create safer, more civil shared experiences for everyone. Why Safety? At Roblox, we strive to connect a billion people with optimism and civility, and the Safety organization’s mission is to become the leader in civil immersive online communities. We systematically and proactively detect, remove, and prevent problematic content and behavior. In doing so, we keep Roblox safe, civil, and inclusive, fostering positive relationships between people around the world. Why Safety AI Systems? As a Principal Machine Learning Engineer for Safety AI Systems, you will define the future of proactive moderation, driving immense social impact through cutting-edge, innovative ML solutions. This role is a fusion of a Principal Engineer's technical authority and an Engineering Manager's leadership, focused on the most critical and ambiguous safety challenges. You will set the 3-5 year technical strategy and architectural blueprint for how Roblox uses machine learning—from high-velocity text filtering to leveraging multimodal Generative AI—to combat the most complex critical harms on the platform. You will own the execution roadmap and technical planning, directly guiding the launch of high-priority new ML projects. You will be responsible for defining the standards of innovation in data quality, model robustness, and ethical deployment across the entire Content & Communication Safety ML pillar. You will lead and scale a high-performing group of individual contributors, providing both strategic oversight and hands-on guidance to the teams responsible for the architectural development of massive-scale systems that mitigate abuse and harassment before it impacts our community. You will feel a deep sense of responsibility in proactively protecting our community—thoughtfully and fairly—while balancing user freedom with platform civility. Your efforts will ensure Roblox remains one of the safest places on the internet for users. You will: Define and Own the Technical Vision: Define and lead the multi-year technical vision, architectural strategy, and execution for machine learning solutions across Content and Communication Safety, ensuring these systems proactively and effectively detect and prevent high-severity, critical harms at massive scale. Provide Principal-Level Architecture: Act as the highest technical authority for the Content Safety ML domain, guiding the architecture and long-term maintainability of foundational models, data pipelines, and real-time inference services. Drive Cross-Org Alignment: Identify and champion the most ambiguous, high-leverage technical problems, driving alignment and securing investment for organization-wide ML infrastructure and platform development initiatives that benefit all of Trust & Safety. Lead Innovation in Safety: Oversee the adoption and safe deployment of innovative technologies (e.g., advanced NLP, self-supervised learning, multimodal LLMs) to anticipate and mitigate novel abuse vectors, moving beyond reactive detection to proactive intervention . Strategic Stakeholder Partnership: Collaborate with executive-level Product, Data Science, Policy, and Operations leaders to define and prioritize the strategic machine learning roadmap, influencing product strategy and demonstrating the impact of ML on user trust and safety outcomes. You have: 8+ years of experience designing, developing, and operating large-scale, high-impact machine learning systems in a production environment. 5+ years of experience in technical leadership, management, or mentorship roles, ideally having managed Engineering Managers or Principal/Staff-level individual contributors. A proven track record of successfully setting the long-term technical direction for an entire ML domain or pillar, demonstrating the ability to take ambiguous problems from concept to scaled production impact. Deep expertise in advanced ML architectures, including Large Language Models (LLMs) , transfer learning, or other foundation model technologies, especially applied to text or multimodal data. Expertise in architecting scalable, real-time ML inference services and robust data pipelines operating at millions of requests per second. Demonstrated success in leading and resolving high-stakes, cross-functional conflicts and technical disagreements, with an ability to build consensus among diverse stakeholders. Exceptional product sense and strategic planning ability: able to translate platform safety requirements into an achievable, iterative technical roadmap. You are: A Visionary Architect: Capable of synthesizing complex business and safety goals into a clear, compelling, and actionable technical strategy. An Inspiring Leader: Passionate about developing the next generation of technical leaders, managers, and engineers. Comfortable with Ambiguity: You thrive in undefined or open-ended problem spaces, providing structure, clarity, and decisive direction to your teams. An Executive Communicator: Highly effective at communicating complex technical concepts to both engineering teams and non-technical executive leadership. Committed to Ethical AI: Dedicated to building ML systems that are fair, transparent, and operate with the utmost responsibility toward user safety and platform civility. For roles that are based at our headquarters in San Mateo, CA: The starting base pay for this position is as shown below. The actual base pay is dependent upon a variety of job-related factors such as professional background, training, work experience, location, business needs and market demand. Therefore, in some circumstances, the actual salary could fall outside of this expected range. This pay range is subject to change and may be modified in the future. All full-time employees are also eligible for equity compensation and for benefits as described on this page. Annual Salary Range $289,460 — $338,270 USD Roles that are based in an office are onsite Tuesday, Wednesday, and Thursday, with optional presence on Monday and Friday (unless otherwise noted). Roblox provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws. Roblox also provides reasonable accommodations to candidates with qualifying disabilities or religious beliefs during the recruiting process. #J-18808-Ljbffr In Summary: At Roblox, we strive to connect a billion people with optimism and civility . The Safety organization’s mission is to become the leader in civil immersive online communities . We systematically and proactively detect, remove, and prevent problematic content and behavior . En Español: Cada día, decenas de millones de personas vienen a Roblox para explorar, crear, jugar, aprender y conectarse con amigos en experiencias digitales inmersivas 3D creadas por nuestra comunidad global de desarrolladores y creadores. En Roblox estamos construyendo las herramientas y plataformas que permitan a nuestra comunidad dar vida a cualquier experiencia que puedan imaginar. Nuestra visión es reinventar la forma en que la gente se reúne, desde cualquier lugar del mundo y en cualquier dispositivo. Estamos en una misión de conectar a un billón de personas con optimismo y civilidad, buscando talento increíble para ayudarnos a llegar allí. Una carrera en Roblox significa que trabajarás para moldear el futuro de la interacción humana, resolver desafíos técnicos únicos a escala y crear experiencias más seguras y civiles para todos. ¿Por qué? Esta función es una fusión entre la autoridad técnica de un ingeniero principal y el liderazgo de un gerente de ingeniería, enfocado en los desafíos de seguridad más críticos e ambiguos. Usted establecerá la estrategia técnica de 3 a 5 años y el plan arquitectónico para cómo Roblox utiliza el aprendizaje automáticodesde filtración de texto de alta velocidad hasta aprovechar la IA generativa multimodalpara combatir los daños críticos más complejos en la plataforma. Poseerá la hoja de ruta de ejecución y la planificación técnica, guiando directamente el lanzamiento de nuevos proyectos de alta prioridad. Será responsable de definir los estándares de innovación en calidad de datos, robustez de modelos y implementación ética en todo el pilar de Seguridad del Contenido & Comunicación ML. Dirigirá y escalará un grupo de colaboradores individuales de alto rendimiento, proporcionando tanto supervisión estratégica como guía práctica a los equipos de desarrollo de sistemas civiles responsables que protegen a través de las mismas plataformas ML mientras que sus usuarios se sienten equilibrados con su responsabilidad por el uso masivo de la libertad civil y mitigar el impacto social sobre nuestra comunidad de desarrollos de derechos humanos. Definir y poseer la Visión Técnica: definir y liderar la visión técnica plurianual, estrategia arquitectónica y ejecución de soluciones para el aprendizaje automático en seguridad del contenido y las comunicaciones, asegurando que estos sistemas detecten de manera proactiva y efectiva y previenen daños críticos a gran escala. Proporcionar Arquitectura de nivel principal: actuar como la más alta autoridad técnica para el dominio de Seguridad del Contenido ML, guiando la arquitectura y mantenimiento a largo plazo de modelos fundamentales, pipelines de datos y servicios de inferencia en tiempo real. Impulsar una alineación transorgánica: identificar y defender los problemas técnicos más ambiguos con alto apalancamiento, alinear e invertir por infraestructura y iniciativas de desarrollo de ML en toda la organización que benefician a todas las plataformas de confianza & Seguridad del producto. Innovación en seguridad: ver la adopción de tecnologías avanzadas innovadoras (por ejemplo, NLP) y su implementación estratégica de tecnología de abuso de datos. Tiene: 8+ años de experiencia en el diseño, desarrollo y operación de sistemas de aprendizaje automático a gran escala con alto impacto en un entorno productivo. 5 + años de experiencias en roles técnicos de liderazgo, gestión u tutoría, idealmente teniendo gerenciado Gerentes de Ingeniería o colaboradores individuales del nivel Principal/Staff. Un historial comprobado de establecer exitosamente la dirección técnica a largo plazo para todo un dominio o pilar ML, demostrando la capacidad de tomar problemas ambiguos desde el concepto hasta los efectos de producción escaladas. Comodidad con la ambigüedad: Prospera en espacios problemáticos indefinidos o abiertos, proporcionando estructura, claridad y dirección decisiva a sus equipos. Un comunicador ejecutivo: altamente eficaz para comunicar conceptos técnicos complejos tanto a los equipos de ingeniería como al liderazgo ejecuctivo no técnico. Comprometido con la IA ética: Dedicado a construir sistemas ML que sean justos, transparentes y operen con la máxima responsabilidad hacia la seguridad del usuario y la civilidad de la plataforma. Para roles basadas en nuestra sede central en San Mateo, CA: La base inicial paga por este puesto es como se muestra a continuación. Roblox proporciona igualdad de oportunidades laborales a todos los empleados y solicitantes de empleo y prohíbe la discriminación y el acoso de cualquier tipo sin importar raza, color, religión, edad, sexo, origen nacional, estado de discapacidad, genética, estatus de veterano protegido, orientación sexual, identidad o expresión de género u otra característica protegida por leyes federales, estatales o locales.