Senior ML Engineer, Next-Gen Recommender Systems

WeHireYou; San Mateo; On-site; PHP 12,290,000 - 15,198,000; Full time

Job summary

Roblox is seeking a Senior Machine Learning Engineer for recommendation systems with a PhD focus. You will design and deploy large-scale ranking, retrieval, and personalization solutions across Roblox surfaces, partnering with researchers and product teams to move from theory to production.

The role emphasizes a strong research track record, publications, and expertise in Python/C++/Go/Java, with exciting opportunities to impact hundreds of millions of users daily.

Qualifications

• Possessing or pursuing a PhD in computer science, engineering, or a related field, with a thesis aligned to Roblox’s research areas.
• Expertise in one or more areas: recommender systems, search systems, information retrieval, or generative models (e.g., LLMs, VLMs, VLAs)
• Ability to design and architect systems for efficient personalization and user interest modeling using advanced attention mechanisms (e.g., sparse/linear attention).
• A strong research track record, evidenced by multiple publications and presentations in top-tier, peer-reviewed venues (e.g., SIGIR, KDD, RecSys, ICLR, ICML, NeurIPS)
• Proficiency in one or more programming languages (e.g., Python, C++, Go, Java) and experience building and optimizing large-scale systems.

Responsibilities

• Design and implement large-scale recommendation systems that power discovery across Roblox’s surfaces — experiences, avatars, and creator content.
• Develop deep learning models for ranking, retrieval, and personalization using approaches in multimodal models, LLMs, and generative AI.
• Collaborate with applied researchers, engineers, and product teams to advance experimentation and accelerate innovation.
• Translate research into production systems that impact hundreds of millions of daily active users.
• Work backward from user and product needs to deliver ML solutions that drive engagement, retention, and ecosystem growth.

Skills

Research experience

Publications

Team collaboration

Education

PhD in CS/Engineering

Tools

Python

C++

Go

Java

Job description

Roblox is seeking a Senior Machine Learning Engineer for recommendation systems with a PhD focus. You will design and deploy large-scale ranking, retrieval, and personalization solutions across Roblox surfaces, partnering with researchers and product teams to move from theory to production.

The role emphasizes a strong research track record, publications, and expertise in Python/C++/Go/Java, with exciting opportunities to impact hundreds of millions of users daily.