Apple Engineer

About the Role FluxInk is bringing our next‑generation AI-powered productivity and inking experience from Windows to MacOS, and from Android to iOS. We are looking for an Apple platform engineer who is passionate about handwriting, creativity tools, AI-assisted workflows, and high‑performance on‑device machine learning . You will be responsible for rebuilding the FluxInk Windows experience on top of native Apple technologies—including SwiftUI, Metal, PencilKit, CoreML, and iOS sandboxed file architecture .

This is a highly technical role involving graphics, real-time rendering, on-device AI, and advanced editor design. Key Responsibilities 1. Application Development & Architecture App Development: Develop new features for native macOS/iOS applications using Swift, SwiftUI or UIKit/AppKit.

C++ SDK Integration: Integrate core C++ libraries into macOS/iOS applications, creating efficient Objective-C++ wrappers to facilitate communication between the C++ engine and native code. Maintain History Codebase: Manage, refactor, and maintain legacy Objective-C and Swift code, ensuring stability and performance. Engine Collaboration: Work closely with the core engine team to define API requirements, troubleshoot low-level issues, and optimize SDK performance.

Hybrid Development: Develop and maintain hybrid features using Webview technologies, with a strong preference for Capacitor and modern JavaScript integration. Performance Optimization: Engineer a modular, fast-loading application specifically tuned for the unified memory of modern iPad and iPhone hardware. Feature Parity: Ensure the iOS apps maintains the same core capabilities as our Android app while delivering a \"native-first\" mobile user experience. 2.

Custom Inking Engine Implementation GPU Rendering: Implement and refine our custom GPU-accelerated rendering engine using WebGPU (or Metal) . Input Precision: Deeply integrate PencilKit while developing custom stroke smoothing, velocity filtering, and vector path modeling. Zero-Lag Goal: Achieve industry-leading precision and sub-millisecond perceived latency for a true \"pen-to-paper\" feel. 3.

Advanced Editor & Data Systems Markdown Native: Build or integrate a native Markdown editor with support for frontmatter, syntax highlighting, and real-time AI assistance. Reliable Data Sync: Design robust local sandboxed storage and iCloud Drive integration using SQLite or CoreData . Security: Manage secure credential storage via the iOS Keychain. 4.

Collaboration & Quality Team Synergy: Work closely with Windows, backend, and AI teams to ensure seamless cross-platform document pipelines. Debug Tooling: Develop internal tools for profiling render loops, ink pipelines, and AI behavior. Required Qualifications Experience: 4+ years of professional experience with Swift and SwiftUI, with a portfolio of complex, high-performance apps.

Graphics Expertise: Proven experience with custom drawing engines, vector graphics, or GPU-accelerated rendering. Technical Mastery: * Proficiency with WebGPU or Metal Performance Shaders (MPS) . Solid understanding of the iOS file system, sandboxing, and background task management.

Hands-on experience with SQLite , CoreData , and WKWebView . Execution: Able to work autonomously, take ownership of technical challenges, and communicate effectively with cross-functional teams. Nice to have skills: AI & Machine Learning: Experience with CoreML and converting ONNX/PyTorch models for the Apple Neural Engine (ANE).

AI Features: Familiarity with handwriting recognition, OCR, or RAG integration. Hardware Integration: Experience with Apple Pencil Hover and Scribble APIs. Domain Knowledge: Previous experience shipping a major stylus, note-taking, or digital art application.

What We Offer Opportunity to build the next-generation AI inking experience on Apple platforms Influence over core architecture and technical direction Work with a world-class AI, product, and design team Chance to define the future of cross‑platform AI notetaking