Roblox Corporation is hiring: Principal Machine Learning Engineer, Engineering E
Roblox Corporation, San Mateo, CA, United States
Principal Machine Learning Engineer, Engineering Efficiency
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 Engineering Efficiency?
The Engineering Efficiency AI Infrastructure Pod acts as Roblox’s center of excellence for applying AI to software engineering. We develop the Code Intelligence components of the Builder AI Platform, enabling first‑party agents to automate engineering toil such as refactoring and unit test generation
At Roblox, we aren't just trying to build another autocomplete tool or a basic LLM wrapper; we are architecting a Code Intelligence platform. Our mission is to move beyond simple code suggestions and into the realm of "agentic reasoning", creating a system that understands the deep, multi‑dimensional context of a massive, 20‑year‑old engine and can autonomously handle the mechanical toil of modern development.
As AI makes it possible to generate code at an unprecedented velocity, our team’s focus shifts from writing code to maintaining quality, safety, and performance at a planetary scale. We are building the reasoning layer and the "Human‑in‑the‑Loop" (HITL) gates that ensure this AI‑driven evolution doesn't compromise the stability of a platform serving 100M+ daily active users. We aren't just using the industry standard; we are inventing the new one .
Joining this team means you will be a leader, bridging the gap between our AI teams, Eng Efficiency and Feature devolvement teams. We are looking for a visionary who can build platforms and first‑party agents that don't just suggest code, but actually understand how to refactor, tune, and evolve the Roblox ecosystem.
You Will:
Architect the Reasoning Layer and design systems that allow agents to navigate a billion-line codebase with high precision.
AI Workload Optimization: Ensure our AI infrastructure is performant and cost‑effective as it scales to become our primary compute driver.
Lead New Techniques: Develop new methods for synthetic data generation and agent evaluations that outperform current industry benchmarks.
You Have:
Beyond "Off‑The‑Shelf": We are looking for an expert who can move past basic LoRA or full‑parameter fine‑tuning to implement Reinforcement Learning from Compiler Feedback (RLCF) and Domain‑Specific Distillation.
Code‑Specific Optimization: The goal is to fine‑tune models to understand the unique constraints of the Roblox Luau language, our internal APIs, and our proprietary high‑performance engine architecture.
Continuous Learning Loops: Architecting the infrastructure that allows our models to "learn" from every human‑corrected diff, ensuring our internal models stay ahead of general‑purpose industry standards.
You Are:
Comfortable with Ambiguity: You thrive in undefined or open‑ended problem spaces, providing structure, clarity, and decisive direction to your teams.
A Pragmatic Builder: You are scrappy and impact‑oriented. You view undefined data and messy systems as opportunities to build structure rather than blockers to progress.
An Inspiring Leader: Passionate about developing the next generation of technical leaders, managers, and engineers.
An Executive Communicator: Highly effective at communicating complex technical concepts to both engineering teams and non‑technical executive leadership.
Data & System Oriented: You understand that robust data and systems are the foundation of any production application, and you design infrastructure for scale, correctness, and reliability.
Curious & Creative : You enjoy tackling hard problems, exploring new technologies, and driving continuous improvements in both systems and workflows.
Annual Salary Range
$345,040 — $399,420 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: The Engineering Efficiency AI Infrastructure Pod acts as Roblox’s center of excellence for applying AI to software engineering . We develop the Code Intelligence components of the Builder AI Platform, enabling first‑party agents to automate engineering toil such as refactoring and unit test generation . Joining this team means you will be a leader bridging the gap between our AI teams, Eng Efficiency and Feature devolvement teams .
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 reimaginar la forma en que la gente se une, desde cualquier lugar del mundo y en cualquier dispositivo. Estamos en una misión de conectar a mil millones de people con optimismo y civilidad, y buscando increíbles talentos para ayudarnos a llegar allí. Nuestra misión es ir más allá de las simples sugerencias de código y entrar en el ámbito del "razón agencial", creando un sistema que entienda el contexto profundo, multidimensional de un motor masivo de 20 años y pueda manejar autónomamente la tarea mecánica del desarrollo moderno. A medida que la IA hace posible generar código a una velocidad sin precedentes, nuestro equipo se enfoca en cambiar de escribir código para mantener calidad, seguridad y rendimiento a escala planetaria. Estamos construyendo la capa de razonamiento y los puertos "Human-in-the-Loop" (HITL) que aseguran que esta evolución impulsada por AI no comprometa la estabilidad de una plataforma 100M + usuarios activos diarios. No somos solo el estándar de la industria; estamos utilizando uno nuevo . Buscamos un visionario que pueda construir plataformas y agentes de primera parte que no solo sugieran código, sino que realmente entiendan cómo refactar, sintonizar y evolucionar el ecosistema Roblox. Usted: Arquitecto de la capa de razonamiento y sistemas de diseño que permitan a los agentes navegar por una base de códigos de mil millones de líneas con alta precisión. AI Optimización de carga de trabajo: Asegurar que nuestra infraestructura de IA sea eficaz y rentable en su escala para convertirse en nuestro motor primordial de computación. Nuevas Técnicas líderes: Desarrollar nuevos métodos de generación de datos sintéticos y evaluaciones de agentes que superen las benchmarks actuales de la industria. Un líder inspirador: apasionado por desarrollar la próxima generación de líderes técnicos, gerentes e ingenieros. Un comunicador ejecutivo: altamente eficaz para comunicar conceptos técnicos complejos tanto a los equipos de ingeniería como al liderazgo executivo no técnico. Datos y Sistemas orientados: entiende que datos robustos y sistemas son la base de cualquier aplicación de producción, y diseña infraestructura para la escala, precisión y fiabilidad. Curioso y creativo: Disfruta abordando problemas difíciles, explorando nuevas tecnologías y impulsando mejoras continuas en ambos sistemas y flujos de trabajo.
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 Engineering Efficiency?
The Engineering Efficiency AI Infrastructure Pod acts as Roblox’s center of excellence for applying AI to software engineering. We develop the Code Intelligence components of the Builder AI Platform, enabling first‑party agents to automate engineering toil such as refactoring and unit test generation
At Roblox, we aren't just trying to build another autocomplete tool or a basic LLM wrapper; we are architecting a Code Intelligence platform. Our mission is to move beyond simple code suggestions and into the realm of "agentic reasoning", creating a system that understands the deep, multi‑dimensional context of a massive, 20‑year‑old engine and can autonomously handle the mechanical toil of modern development.
As AI makes it possible to generate code at an unprecedented velocity, our team’s focus shifts from writing code to maintaining quality, safety, and performance at a planetary scale. We are building the reasoning layer and the "Human‑in‑the‑Loop" (HITL) gates that ensure this AI‑driven evolution doesn't compromise the stability of a platform serving 100M+ daily active users. We aren't just using the industry standard; we are inventing the new one .
Joining this team means you will be a leader, bridging the gap between our AI teams, Eng Efficiency and Feature devolvement teams. We are looking for a visionary who can build platforms and first‑party agents that don't just suggest code, but actually understand how to refactor, tune, and evolve the Roblox ecosystem.
You Will:
Architect the Reasoning Layer and design systems that allow agents to navigate a billion-line codebase with high precision.
AI Workload Optimization: Ensure our AI infrastructure is performant and cost‑effective as it scales to become our primary compute driver.
Lead New Techniques: Develop new methods for synthetic data generation and agent evaluations that outperform current industry benchmarks.
You Have:
Beyond "Off‑The‑Shelf": We are looking for an expert who can move past basic LoRA or full‑parameter fine‑tuning to implement Reinforcement Learning from Compiler Feedback (RLCF) and Domain‑Specific Distillation.
Code‑Specific Optimization: The goal is to fine‑tune models to understand the unique constraints of the Roblox Luau language, our internal APIs, and our proprietary high‑performance engine architecture.
Continuous Learning Loops: Architecting the infrastructure that allows our models to "learn" from every human‑corrected diff, ensuring our internal models stay ahead of general‑purpose industry standards.
You Are:
Comfortable with Ambiguity: You thrive in undefined or open‑ended problem spaces, providing structure, clarity, and decisive direction to your teams.
A Pragmatic Builder: You are scrappy and impact‑oriented. You view undefined data and messy systems as opportunities to build structure rather than blockers to progress.
An Inspiring Leader: Passionate about developing the next generation of technical leaders, managers, and engineers.
An Executive Communicator: Highly effective at communicating complex technical concepts to both engineering teams and non‑technical executive leadership.
Data & System Oriented: You understand that robust data and systems are the foundation of any production application, and you design infrastructure for scale, correctness, and reliability.
Curious & Creative : You enjoy tackling hard problems, exploring new technologies, and driving continuous improvements in both systems and workflows.
Annual Salary Range
$345,040 — $399,420 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: The Engineering Efficiency AI Infrastructure Pod acts as Roblox’s center of excellence for applying AI to software engineering . We develop the Code Intelligence components of the Builder AI Platform, enabling first‑party agents to automate engineering toil such as refactoring and unit test generation . Joining this team means you will be a leader bridging the gap between our AI teams, Eng Efficiency and Feature devolvement teams .
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 reimaginar la forma en que la gente se une, desde cualquier lugar del mundo y en cualquier dispositivo. Estamos en una misión de conectar a mil millones de people con optimismo y civilidad, y buscando increíbles talentos para ayudarnos a llegar allí. Nuestra misión es ir más allá de las simples sugerencias de código y entrar en el ámbito del "razón agencial", creando un sistema que entienda el contexto profundo, multidimensional de un motor masivo de 20 años y pueda manejar autónomamente la tarea mecánica del desarrollo moderno. A medida que la IA hace posible generar código a una velocidad sin precedentes, nuestro equipo se enfoca en cambiar de escribir código para mantener calidad, seguridad y rendimiento a escala planetaria. Estamos construyendo la capa de razonamiento y los puertos "Human-in-the-Loop" (HITL) que aseguran que esta evolución impulsada por AI no comprometa la estabilidad de una plataforma 100M + usuarios activos diarios. No somos solo el estándar de la industria; estamos utilizando uno nuevo . Buscamos un visionario que pueda construir plataformas y agentes de primera parte que no solo sugieran código, sino que realmente entiendan cómo refactar, sintonizar y evolucionar el ecosistema Roblox. Usted: Arquitecto de la capa de razonamiento y sistemas de diseño que permitan a los agentes navegar por una base de códigos de mil millones de líneas con alta precisión. AI Optimización de carga de trabajo: Asegurar que nuestra infraestructura de IA sea eficaz y rentable en su escala para convertirse en nuestro motor primordial de computación. Nuevas Técnicas líderes: Desarrollar nuevos métodos de generación de datos sintéticos y evaluaciones de agentes que superen las benchmarks actuales de la industria. Un líder inspirador: apasionado por desarrollar la próxima generación de líderes técnicos, gerentes e ingenieros. Un comunicador ejecutivo: altamente eficaz para comunicar conceptos técnicos complejos tanto a los equipos de ingeniería como al liderazgo executivo no técnico. Datos y Sistemas orientados: entiende que datos robustos y sistemas son la base de cualquier aplicación de producción, y diseña infraestructura para la escala, precisión y fiabilidad. Curioso y creativo: Disfruta abordando problemas difíciles, explorando nuevas tecnologías y impulsando mejoras continuas en ambos sistemas y flujos de trabajo.