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

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.

The Marketplace team at Roblox is reimagining how the Roblox community discovers, interacts with, and personalizes avatar content. From search and recommendation systems to cutting-edge models for understanding text and visual content, our mission is to drive discovery and personalization for avatar bodies, clothing, accessories, outfits, and beyond. Our work impacts both users and creators, ensuring that the Marketplace serves the diverse needs of the Roblox ecosystem.

The focus areas for this team include:  recommender systems, search systems, personalization, multimodal models, content understanding, and computer vision.

You Will:

• Build end-to-end machine learning solutions for search, recommendation, and content understanding by working backward from product needs.
• Design, implement, and optimize deep learning models that drive discovery and personalization across the Marketplace.
• Explore novel modeling approaches for ranking, retrieval, multimodal content understanding, and query understanding.
• Develop robust and scalable production systems to serve high-scale search and recommendation requests.

You Have:

• Possess or pursuing a Ph.D. in Computer Science, Computer Engineering, Data Science, or a similar technical degree.
• Proficiency in one or more programming languages such as Go, Node.js, Ruby, Python, C++, Lua, Swift, C#, or Java
• Expertise in areas such as recommender systems, search technologies, personalization strategies, or advanced content understanding techniques
• Experience with state-of-the-art techniques in deep learning, including LLMs, multimodal models, NLP, or computer vision.
• Excel at building and working on end-to-end ML systems, from data analysis and ML modeling to production pipelines.
• Published and presented peer-reviewed articles in top-tier venues.

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.