Principal Software Engineer (Physics)

TL;DR

Principal Software Engineer (Physics): Developing Roblox's proprietary distributed physics engine with an accent on mathematical models, rigid body dynamics, and real-time performance. Focus on innovating physics features, optimizing solver robustness, and integrating low-level systems across multiple platforms.

Location: Hybrid (San Mateo, CA). Must be onsite Tuesday, Wednesday, and Thursday.

Company

Roblox is a global platform that empowers a community of developers to create immersive 3D digital experiences.

What you will do

• Innovate and implement powerful physics features to enable immersive and dynamic user experiences.
• Drive research and rapid prototyping to translate new ideas into practical, long-term technical solutions.
• Optimize and enhance the robustness and performance of the proprietary physics engine.
• Collaborate with internal teams and external developers to resolve technical challenges and improve feature utilization.

Requirements

• 10+ years of professional experience in high-performance C++ development (2+ years with an advanced degree).
• Expertise in multithreading and SIMD optimization techniques and modern computer architecture.
• Practical experience applying numerical methods to real-time physics simulation.
• Proven track record of deploying real-time and online multiplayer physics simulations.
• Hands-on experience with physics SDKs such as PhysX, Havok, or Bullet.
• Degree in Computer Science, Mathematics, Physics, or Engineering.
• Valid US work authorization (some visa categories and H-1B sponsorship may not be supported).

Culture & Benefits

• Equity compensation and comprehensive benefits package.
• Flexible work schedule with optional office presence on Mondays and Fridays.
• Opportunity to work on unique technical challenges at a massive global scale.