Software Engineer - Systems Performance, CoreOS
Confirmed on the employer's own hiring board on Oct 16, 2026. First seen by Alion on Oct 14, 2026. Apple scores B on the Alion truth index.
The OS Performance team is looking for a software developer with a keen understanding of app development and systems design to support our efforts building Apple's family of operating systems. Our work enables iOS, macOS, tvOS, and watchOS to perform well, and gives developers the platform they need to easily write great performing apps.
A successful candidate may have experience with a specific layer of software (e.g. embedded, UI, server) but more importantly an interest in learning how the entire stack and flow of information works. The ideal candidate would also not only understand the fundamentals of designing and implementing a performant application for iOS, macOS, tvOS, or watchOS, but also have an appreciation for using data to drive decision making in software development.
Description
Work on various aspects of Apple’s operating systems to tackle challenging multi-faceted performance problems. You will be solving problems in the areas of usability/UX, cross-platform compatibility, API design, and performance of the operating system. You will also have the opportunity to work directly with app developers on Apple platforms to discover and resolve API gaps. An ideal candidate will be ambitious and grow to understand many layers of software.
Minimum Qualifications
Expertise in at least one layer of software development (embedded, UI, server)
You understand how to apply data science rigor to decision making in software development
Aptitude to independently learn new technologies, prototype, and propose software design and solutions
Passion for product quality and attention to detail
Self-motivated and able to work independently
Excellent problem-solving and critical thinking
Prior development in Unix, Linux, or macOS
Excellent spoken and written communication
CS degree or equivalent experience
Preferred Qualifications
App development experience on iOS, macOS, watchOS, tvOS, or visionOS
Understanding of Operating System fundamentals
Strong expertise using Objective-C or Swift
Practical knowledge of Apple SDK technologies like SwiftUI, Swift Data, Swift Concurrency, etc.