Roblox is hiring a Principal Machine Learning Engineer to lead the development of our Code Intelligence platform. You'll move beyond basic code suggestions to architect agentic reasoning systems for our massive, 20-year-old engine. Your work will define how AI-driven code evolution operates at planetary scale while ensuring quality, safety, and performance.
What You'll Do
- Architect the Reasoning Layer and design systems that allow agents to navigate a billion-line codebase with high precision.
- Ensure AI infrastructure is performant and cost-effective as it scales to become our primary compute driver.
- Develop new methods for synthetic data generation and agent evaluations that outperform current industry benchmarks.
- Implement Reinforcement Learning from Compiler Feedback (RLCF) and Domain-Specific Distillation.
- Fine-tune models to understand the unique constraints of the Roblox Luau language, internal APIs, and our proprietary high-performance engine architecture.
- Architect the infrastructure for continuous learning loops from human-corrected diffs.
What We're Looking For
- Expertise moving beyond basic LoRA or full-parameter fine-tuning to implement Reinforcement Learning from Compiler Feedback (RLCF) and Domain-Specific Distillation.
- Ability to fine-tune models to understand the unique constraints of the Roblox Luau language, internal APIs, and proprietary high-performance engine architecture.
- Experience architecting continuous learning infrastructure for models.
- Comfortable with ambiguity in null or open-ended problem spaces.
- Pragmatic, scrappy, and impact-oriented builder.
- Inspiring leader passionate about developing the next generation of technical talent.
- Highly effective executive communicator for both engineering teams and non-technical leadership.
- Data & System oriented, designing infrastructure for scale, correctness, and reliability.
- Curious & creative problem solver.
Team & Environment
You will be part of the Engineering Efficiency AI Infrastructure Pod, bridging the gap between AI teams, Eng Efficiency, and Feature development teams.
Benefits & Compensation
- Salary range: $345,040—$399,420 USD
- Eligible for equity compensation
Work Mode
This is a hybrid position based in our San Mateo, CA office.
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.
