Principal macOS Engineer

About Iru

Iru is the AI-powered security & IT platform used by the world’s fastest-growing companies to secure their users, apps, and devices. Built for the AI era, Iru unifies identity & access, endpoint security & management, and compliance automation—collapsing the stack and giving IT & security time and control back.

Iru is backed by some of the smartest investors in tech—General Catalyst, Tiger Global, Felicis, Greycroft, and First Round Capital. In July 2024, Iru raised $100 million from General Catalyst, valuing the company at $850 million. Customers include Notion, Cursor, Lovable, Replit, and Mercor, and Iru partners with industry leaders such as ServiceNow and AWS. Iru was named to Forbes’ America’s Best Startup Employers 2025 list for employee engagement and satisfaction.

The Opportunity

We are looking for a Principal Engineer with experience building and shipping enterprise software on the macOS platform. As a Principal Engineer at Iru, you will lead development and innovation with our proprietary macOS agent and suite of applications. Principal Engineers have the opportunity to deliver and define strategic Iru business level objectives and key components of our research and development projects.

How You'll Make a Difference Day to Day

Hands on coder with ability to architect and contribute code for new features and proof of concepts Create architectures and high-level designs to meet our strategic objectives that are flexible and enable many options in the future without 100% clarity on what that future is Identify technology and strategic growth opportunities that enable Iru to grow as a business and rally the organization behind these choices by providing clear rationale and technical vision. Become an authority on the technologies of your team with the ability to answer questions to guide other developers and inform business management Collaborate cross functionally with distributed teams; much of our workforce is remote Work closely with engineering counterparts on other projects to ensure consistent architecture and product alignment Help drive quality by working with teams to promote modularized code that is testable, performant, and easy to maintain with multi-staged validation plans Design and deliver systems that require research on what is 'possible' rather than simply relying on past experience

We’d love to hear from you if you have

Experience with complex concurrency management using OperationQueue and Grand Central Dispatch. Experienced macOS developer with a clear understanding of the differences between macOS and other Apple platforms, such as iOS, with a deep understanding of technologies specific to macOS. Highly familiar with AppKit, Foundation, Core Graphics, Core Animation and other relevant frameworks. Strong technical communication skills that will enable you to collaborate effectively with peers and leadership Passion to dig in and lead the development of ground-breaking features and products Expertise developing native applications for macOS (Swift, Objective-C, C++) Deep understanding of operating system fundamentals, Cocoa design patterns, protocol-oriented programming, internals such as kernel mode and user mode, device drivers, filesystems, networking concepts, process and application management, security and access control Familiarity with network applications security and secure coding practices with ability to understand and assess client-side network and API code Experience working in Agile software development team and familiarity with build processes and best dev practices such as TDD / CI / CD Understanding of authentication protocols in the macOS enterprise system (e.g. enterprise connect)

Nice to haves, but NOT required

Excellent presentation skills with ability to deliver messages around ideas and effectively present them to both the executive team and broader engineering team alike 5+ years of expertise in Swift and advanced features of the language Experience writing BSD libraries and other low level macOS technologies Knowledge of System and Network extension technologies Experience in the enterprise security space Experience with managing a large fleet of Apple devices in an Enterprise environment (Mac admin) is a plus Mastery of MacOS/Mach/BSD module, driver, and kernel extensions Ability to say “I don’t know, but will find out” with the confidence in your abilities to deliver that unknown answer