Senior Software Engineer, On-Device Health Agentic Systems

Apple • Cupertino, CA

27d

About The Position

We are seeking a senior iOS Software Engineer with deep experience building
applications powered by Large Language Models (LLMs). This is a hands-on
development role focused on creating the next generation of intelligent
on-device experiences for Apple users. You will be responsible for building
cutting-edge iOS applications that serve as the primary interface for on-device
AI. A key part of your role will be to explore and define the software
architecture for a scalable, high-performance system that seamlessly integrates
powerful LLM agents into the Apple ecosystem, all while prioritizing user
privacy and on-device performance. This role is for an expert iOS developer
passionate about building the foundational architecture for AI-driven
applications.

DESCRIPTION

What You'll Build: - AI-Powered iOS Applications: Architect and build
innovative, high-performance on-device apps that showcase the power of
intelligent LLM agents. - Scalable On-Device Architecture: Design the
client-side frameworks and architectural patterns for integrating LLM systems
efficiently on iOS. - LLM Agent Integration: Implement the software that
connects user-facing applications to on-device and hybrid AI reasoning and
planning engines. - Interactive AI Prototypes: Rapidly build and iterate on
application prototypes to explore new user interactions and architectural
options. Impact: This is a unique opportunity to define the future of
intelligent applications at Apple. You will be at the center of building a new
class of on-device experiences, setting the architectural foundation for how
millions of users will interact with AI on a daily basis.

Requirements

• 5+ years of professional software development with expert-level experience building high-performance, consumer-facing mobile applications and frameworks.
• Strong proficiency in a modern systems programming language such as C++, ObjectiveC/Swift, or Rust.
• A demonstrated ability to quickly master new languages and platforms is highly valued.
• Deep understanding of mobile system fundamentals: concurrency, memory management, and power optimization.
• Practical knowledge of how LLM-powered systems work, including prompt engineering, agent frameworks, or RAG architectures.

Nice To Haves

• Experience with on-device ML frameworks like Core ML, Foundation Model, etc.
• Experience in SwiftUI and modern iOS architectural patterns.
• Knowledge of model quantization, caching, and other on-device optimization techniques.
• Experience with multi-platform development (e.g., building for both iOS and macOS).

Responsibilities

• AI-Powered iOS Applications: Architect and build innovative, high-performance on-device apps that showcase the power of intelligent LLM agents.
• Scalable On-Device Architecture: Design the client-side frameworks and architectural patterns for integrating LLM systems efficiently on iOS.
• LLM Agent Integration: Implement the software that connects user-facing applications to on-device and hybrid AI reasoning and planning engines.
• Interactive AI Prototypes: Rapidly build and iterate on application prototypes to explore new user interactions and architectural options.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed