Senior Software Engineer, Client Systems (C++)

About the Role

The Luau App Foundations team is responsible for the core infrastructure of the Roblox application. They bridge the gap between app and the performance-heavy Roblox game engine. This team is building the unified stack that powers mission-critical surfaces like Home, Avatar, and Social for millions of concurrent users. They make it possible for "Web-style" development efficiency to exist within a high-performance C++ game engine.

Why is this role exciting:

• Technical Pioneer: Write libraries and modules using C++ inside a world-class proprietary Game Engine.
• Systematic Impact: Build frameworks and components used by dozens of other engineering teams.
• Complex Problem Solving: Manage smooth data flow across client devices ranging from low-end mobile phones to high-end gaming PCs.
• 0 to 1 Transitions: Lead the charge in shaping crucial components of the App written in C++ inside the Game Engine.

Key Challenges:

• Bridging Tech Stacks: Libraries sit between a modern UI (Luau) and the Core Game engine layer and platform layers.
• Large-Scale Performance: Diagnosing memory usage and framerate issues across millions of daily active users.
• Standardizing Chaos: Enforcing clean, modular, and testable code standards across the organization.
• Platform Universality: Ensuring foundation works across iOS, Android, Windows, Mac, and Consoles.

Responsibilities

• Be the primary C++ expert in the team and drive frontend C++ strategy for extending the interface layer.
• Work with stakeholders across Engineering, Product, and Design to expand frontend ecosystems and drive technical enhancements.
• Implement innovative solutions to feature requests and collaborate with Roblox Surface owners on new initiatives.
• Work with internal team members and community developers to improve the overall state of Lua App on Roblox.

Qualifications

• 4+ years of experience with significant knowledge of system or mobile programming.
• Strong C++ programming skills with an ability to write high quality, performant code.
• Experience with Lua is a plus.
• Passion for building frameworks and libraries with world-class design patterns and system architecture.
• Strong performance focus, with an ability to implement performant solutions for platforms including mobile.
• Self-sufficient, self-organized, and able to take ownership of projects throughout their full lifecycle.
• Strong interpersonal and communication skills.