Principal Software Engineer - Avatar Personalization

San Mateo, CA · San Mateo · USD 295,250-345,040 / year · 8+ years experience · Full-time · Onsite · Posted Oct 15, 2026

At a glance

The Principal Software Engineer on the Avatar Personalization team will use the Roblox game engine to build features that push the boundaries of avatar technology.
This role involves tackling major architectural projects, providing technical leadership, and coordinating across teams to build systems for millions of players and developers.

Implement groundbreaking features in the Roblox game engine to build an advanced avatar system.
Build APIs for Roblox developers to enable in-experience creation of avatars from scratch.
Enhance avatar fidelity and uniqueness on the platform.
Build vertical applications for mobile, tablet, PC, and console platforms using the Roblox game engine.
Refactor and improve existing codebase.
Establish architectural standards for system reliability, performance, and test coverage.
Collaborate with numerous teams to build a user-generated gaming platform.
Implement systems using a combination of C++ and Lua.

8+ years of professional experience working on a consumer-facing game engine and/or game application.
Proficiency with C++, 3D math, data structures, algorithms, and networking.
Experience working on character building and customization systems, editors, and content creation tools.
Experience building online console or mobile game titles.
Experience with game or film character systems such as animation, rigid-body or cloth/hair physics, or shading.