macOS Application Engineer

Phinomenon is built by browser and cloud veterans — our founders behind FydeOS (a Chromium-based OS trusted by millions) and QingCloud (one of China's earliest API-first IaaS platforms founded in 2012). Fresh off a healthy, eight‑figure Series A raise, we've got the cash runway one needs to dream big without panicking about next week's payroll. With folks working from San Francisco, London, Beijing, Shanghai and Shenzhen, we're proudly global and friendly to your time zone, with overlapping hours so we can all actually talk. We ship fast and ship hard — but burnout is so last decade, so we bake in wellness stipends, mandatory recharge days and flexible schedules, because great code comes from healthy lives. If you want to build the nextgen browser that actually, you know, gets you — while still enjoying your evenings and maintaining upright posture — welcome home.

As our macOS Application Engineer, you'll architect and implement the Phi Browser desktop experience — designing and building native features like context‑aware assistants, offline‑ready tools, and seamless UI that feels personal. You'll collaborate with frontend, backend, and AI teams to integrate model-powered features right into the macOS ecosystem, ensuring fast, reliable, and delightful user experiences.

• Design, develop, and maintain production-grade macOS applications using Swift, AppKit, and SwiftUI
• Implement AI-enhanced features: inline suggestions, contextual pop-ups, real-time summarization
• Optimize performance: memory, CPU usage, UI rendering, offline usage
• Debug across macOS versions, manage sandboxing, entitlements, and packaging
• Collaborate with cross-functional teams on UX, design, QA, and documentation
• Maintain test coverage: unit, UI, and CI/CD pipelines
• Stay current with latest Apple frameworks, standards, and platform APIs

• 3+ years of hands‑on macOS app development using Swift and AppKit/SwiftUI
• Solid understanding of macOS application lifecycle, sandboxes, entitlements, and notarisation
• Experience in integrating networked APIs (REST, WebSocket)
• Strong proficiency in debugging, profiling, and optimizing app performance
• Familiarity with packaging and distributing Mac apps via notarisation
• Excellent collaboration and communication skills in remote teams

• Objective-C, C++ experience or bridging mixed-language codebases
• Knowledge of Core Animation, Core Data, AVFoundation, or File System APIs
• Experience with AI/ML or embedding inference engines on-device
• Contributions to open-source macOS tools or libraries
• Experience shipping AI-powered desktop apps or features