Senior Machine Learning Engineer (Economy ML)

Location: San Mateo, California, United States; office-based roles are onsite Tuesday, Wednesday, and Thursday, with optional presence on Monday and Friday.

Salary: $260,300–$312,970 annual base pay, plus equity and benefits for full-time employees.

Company

Roblox builds a platform and tools for creating and participating in 3D immersive digital experiences, including a virtual economy for users, creators, and developers.

What you will do

• Design and iterate on retrieval, ranking, generative recommendation, pricing, and optimization models across Marketplace, Developer Monetization, and Payments.
• Build and deploy end-to-end ML solutions, covering data and feature exploration, modeling, evaluation, and production deployment.
• Optimize models for training and serving at scale while balancing quality, latency, compute, and cost through distributed training and production serving.
• Design A/B and multi-cell experiments tied to engagement, bookings, conversion, revenue, and creator earnings.
• Monitor data and prediction quality, detect drift and regressions, and contribute to on-call practices for ML services.
• Partner with Product, Backend, Data Science, Design, Marketplace, and Economy teams; shape technical direction and mentor engineers.

Requirements

• 3+ years of industry experience building recommendation, search, or ranking systems for a high-scale product; pricing or content-understanding experience is a plus.
• Hands-on expertise with recommender architectures such as sequence models, multi-task ranking, and large sparse embeddings, including efficient multi-GPU training and serving.
• Experience taking ML problems from messy data and product ambiguity through modeling, evaluation, and stable production deployment.
• Strong coding skills in Python and PyTorch.
• Ability to reason about the impact of model choices on LTV, engagement, conversion, and creator earnings.
• Experience designing experiments, diagnosing metric movements, and maintaining statistical rigor and ecosystem guardrails.
• Ability to collaborate with engineers, product managers, data scientists, and designers across multiple stakeholders.
• Comfort balancing short-term improvements with foundational investments in data, infrastructure, and modeling quality.

Nice to have

• Experience with pricing or content understanding.
• Experience applying LLM or multimodal techniques to recommendation.

Culture & Benefits

• Full-time employees are eligible for equity compensation and benefits.
• Work involves cross-functional collaboration across Marketplace, Payments, Developer Monetization, and broader Economy teams.
• Roblox provides equal employment opportunities and reasonable accommodations during the recruiting process.
• The company may not be able to employ candidates whose United States work authorization is tied to certain U.S. visa categories and does not currently support future H-1B sponsorship.