[2026] Senior Machine Learning Engineer (Systems), Embodied AI/NPCs, ML Platform - PhD Early Career

• Pioneer next-generation AI tooling to enhance the efficiency, cost, and usability of ML@Roblox.
• Build and maintain core platform components: Serving Layer, Model Registry, Pipeline Orchestrator, and Training/Inference control planes.
• Design great developer experiences (paved-road templates, tooling, visualizations) to reduce time-to-production and ensure foundational AI systems are scalable and reliable.

• Architect and implement scalable distributed inference systems for efficiently serving LLMs and Large Recommender Models at massive scale.
• Optimize our inference engine to serve millions of QPS at low latency.
• Conduct deep, low-level performance analysis and optimize ML models (using techniques like continuous batching, speculative decoding, and quantization) and systems on GPU architectures to maintain peak performance and stability.

• Possessing or pursuing a Ph.D. in Computer Science, Computer Engineering, Mathematics, Statistics, or a related technical field, with a thesis aligned to Roblox’s research areas.
• Built end-to-end ML pipelines and managed model inference and deployment.
• Experience with novel datasets, and building real-world agentic applications.
• Scaled high-performance, high-availability architectures.
• Handled infrastructure using Kubernetes and major cloud providers (AWS, Azure, or GCP).

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 as described on this page .

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.

For US based roles only, please note the Company may not be able to employ candidates for this role who have United States work authorization related to certain U.S. visa categories, or support future H-1B sponsorship at this time.