Senior Tools Software Engineer needed with 5+ years of Unity development experience and 2+ years of editor development. Responsibilities include designing and developing a library of UI primitives for editor creation, building editors and tools for various teams (programmers, artists, designers, localizers), integrating solutions across teams, and contributing to system documentation. Strong skills in Unity UI Toolkit, complex system architecture, UI/UX, and code reviews are essential. Experience with large-scale game projects and game development is a plus.