Staff Software Engineer, Core Engine

The opportunity

We're looking for a Staff Engineer to join the Runtime team within the Core Engine group here at Unity. You'll be responsible for designing, implementing, and maintaining the low-level systems that form the backbone of the Unity runtime. You'll work across subsystems including transforms, the player loop, the job system, serialization, and support higher level features like physics and netcode. Your work will directly impact the performance, stability, and capabilities available to millions of developers worldwide.

This is a highly technical individual contributor role with significant influence over architectural decisions and engineering practices. You'll collaborate closely with teams across rendering, physics, animation, scripting, and platform engineering to ensure the core engine meets the evolving needs of real-time 3D content creation.

This role requires deep expertise in C++ and systems programming, a track record of technical leadership, and the ability to mentor engineers while driving critical initiatives that shape how creators build with Unity.

What you'll be doing

Design and implement core runtime systems with a focus on performance, memory efficiency, and cross-platform compatibility

Lead technical initiatives spanning multiple teams, driving alignment on architecture and implementation approaches

Profile, analyze, and optimize engine performance across diverse hardware targets including consoles, mobile devices, desktop, and emerging platforms

Mentor and support engineers across the organization, raising the bar for code quality and engineering rigor

Contribute to technical strategy and roadmap planning for the core engine

Write clear technical documentation and participate in design reviews

Debug complex, system-level issues that span multiple subsystems

Evaluate and integrate new platform capabilities and hardware features