Senior UI Compositing Engineer

Cupertino, California, United States Software and Services

Apple's Compositing, Color, and Display Software organization provides the graphics software foundation for all of Apple's innovative products, including iPhone, iPad, Apple TV, Mac, Apple Watch and Vision Pro. Our goal is to enable developers and UI designers to create exceptional visual experiences by efficiently utilizing hardware acceleration and color technologies through compositing and display. We're a highly technical team working on critical compositing and windowing system components across Apple's platforms.

Our mission is to maintain and evolve the compositing infrastructure that powers billions of devices. We tackle challenging problems in scheduler architecture, event processing, security rendering, hardware integration, and legacy system support while maintaining the high-quality standards our users expect. If you are passionate about building efficient compositing systems, optimizing for new hardware capabilities, and great battery life for millions of users worldwide, we want to hear from you.

If you're excited about working across the full spectrum of compositing challenges—from scheduler design to event handling to security features—this role is for you.

We're seeking an exceptional senior software engineer who combines deep technical expertise with versatility and strong leadership to work across our UI Compositing team. You will contribute to the core compositing infrastructure that powers all Apple devices, working on challenges that span from low-level system optimization to cross-platform feature development. This role requires the ability to context-switch between different technical domains while maintaining the same high standards of quality and performance.

As part of the UI Compositing team, you will play a central role within our graphics stack. Your work will span multiple areas of compositing infrastructure—optimizing how frames are scheduled and displayed, implementing visual security features, handling user input events, and maintaining critical system code. You'll work on problems that balance performance with battery life, ensure security and privacy, and maintain the reliability of systems that billions of users depend on daily.

Partnering with GPU driver teams, Display teams, and Metal framework engineers, you'll help shape compositing infrastructure across iOS, macOS, tvOS, and watch

OS. Our team values versatility, deep technical expertise, and a proactive approach to problem-solving. We work in complex codebases where autonomy, strong debugging skills, and the willingness to dive deep into intricate system-level code are essential. The ability to move fluidly between different technical challenges and work across the full compositing stack is critical to success in this role.

• Contribute to core compositing infrastructure across multiple technical areas of the team
• Work on performance optimization including frame scheduling and display synchronization across iOS, macOS, tvOS, and watchOS
• Design and implement compositing features that balance visual quality, battery life, and hardware capabilities
• Build system features that ensure security and privacy for users
• Work on input handling and event processing systems
• Maintain and evolve critical system code, balancing modernization with stability and compatibility
• Drive technical decisions on complex cross-platform compositing challenges
• Work with new hardware capabilities including advanced display technologies
• Identify and resolve compositing issues across the codebase through systematic debugging and root cause analysis
• Collaborate with GPU driver teams, Display teams, and Metal framework engineers
• Navigate seamlessly between different Apple platform codebases and technical domains
• Champion clean, maintainable solutions and contribute to knowledge transfer initiatives
• Mentor junior engineers and provide technical guidance across compositing areas

• 5+ years of experience in software development with strong systems programming background
• Deep familiarity with Unix environments, system programming, and low-level…