[2025] Senior Machine Learning Engineer, PhD New Grad - Communication Safety

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.

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, and we make Roblox accounts secure and free from compromise. We also keep the platform compliant for changing regulations and growth markets. We cover a broad area of the tech spectrum, including machine learning, experimentation, automation, highly scalable distributed backend systems, detection workflows, and AI-powered text filters. Aligned and partnering with product teams, we use this tool belt to discover new opportunities, influence and shape the product roadmap and prioritization, build safety products, and measure the impact on our community of users and developers. In doing so, we keep Roblox safe, civil, and inclusive, and we foster positive relationships between people around the world.

As a Senior Machine Learning Engineer in Communications Safety, you will build and develop systems to ensure that user-generated content across Roblox is safe and civil. You'll work on some of the most challenging problems we face, from real-time voice and text safety, to using LLMs at the cutting edge of content moderation.

You Will:

• Build end-to-end ML systems to detect and address problematic content on Roblox.
• Design tools and systems that serve millions of Roblox users every day.
• Partner up with ML and Software engineers alike, enabling ML at all levels of the stack.
• Help define the team's roadmap and long-term strategy towards keeping content and features on Roblox safe.

You Have:

• Possess or pursuing a Ph.D. in Computer Science, Computer Engineering, Data Science, or a similar technical degree.
• Experience designing and supporting data systems (pipelines, tables, telemetry, batch/streaming jobs, etc.)
• Deep expertise in PyTorch or equivalent ML frameworks.
• Proficiency with distributed data processing systems like Spark.
• Interest in building and deploying ML systems to production at scale for voice or text.
• A passion for Building scalable AI solutions for real-time moderation and detection systems.

You Are:

• Data-Literate: Schema design, telemetry, batch and streaming frameworks at scale. You understand the challenges of keeping data both intuitive to use and trustworthy.
• Responsible: You build systems that are robust, and use production incidents to learn and improve.
• Resourceful: You're adaptable in any situation and can always find a path forward.
• Analytical: Excited to investigate large, ambiguous problems, and quantify the problems and the solutions.
• Team Oriented: You lift up your peers and find ways to make the team stronger. You foster a culture of technical excellence.
• Mission Oriented: You stay laser-focused on the mission and are versatile, creative, and strategic to achieve it. You think long-term, and find ways to deliver short-term value on the way to get there.
• User Oriented: You always start with the needs of the user, whether they are Roblox users or internal engineers before architecting a solution.

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.

Annual Salary Range$218,540—$218,540 USD

Roles that are based in our San Mateo, CA Headquarters are in-office Tuesday, Wednesday, and Thursday, with optional in-office on Monday and Friday (unless otherwise noted).

You’ll Love: 

• Industry-leading compensation package
• Excellent medical, dental, and vision coverage
• A rewarding 401k program
• Flexible vacation policy (varies by exemption status)
• Roflex - Flexible and supportive work policy 
• Roblox Admin badge for your avatar
• At Roblox HQ: 
• Free catered lunches five times a week and several fully stocked kitchens with unlimited snacks
• Onsite fitness center and fitness program credit
• Annual CalTrain Go Pass

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 for all candidates during the interview process.