Principal Software Engineer: Real-Time Physics & Performance

OneClick Smart Resume; San Mateo (CA); On-site; USD 295,000 - 345,000; Full time

Benefits offered by this job

Equity compensation

Job summary

Roblox is seeking a Principal Software Engineer, Physics, to lead the design and implementation of the distributed physics engine. You will develop high-performance C++ physics features and work on real-time multiplayer simulations for billions of concurrent experiences.

You will collaborate with cross-functional teams to optimize engine integrations, apply numerical methods, and ensure scalable, reliable physics across platforms.

Qualifications

• Advanced C++ development experience.
• Strong background in performance engineering (multithreading/SIMD).
• Experience applying numerical methods to real-time physics.
• Hands-on with real-time, online multiplayer physics simulations.
• Familiarity with physics SDKs such as PhysX, Havok, and Bullet.

Responsibilities

• Innovate and implement powerful physics features for Roblox developers to create immersive experiences.
• Drive research and rapid prototyping, turning ideas into durable solutions.
• Optimize robustness and performance of the physics engine and integrations.
• Collaborate with internal teams and external developers to resolve technical challenges and improve feature usage.

Skills

C++ Development

Performance Engineering

Numerical Methods

Real-time Physics

Physics SDK

Education

Bachelor's or higher in CS/Math/Physics/Engineering

Tools

PhysX

Havok

Bullet

Job description

Roblox is seeking a Principal Software Engineer, Physics, to lead the design and implementation of the distributed physics engine. You will develop high-performance C++ physics features and work on real-time multiplayer simulations for billions of concurrent experiences.

You will collaborate with cross-functional teams to optimize engine integrations, apply numerical methods, and ensure scalable, reliable physics across platforms.