Senior Software Engineer, On-Device Health Agentic Systems
Confirmed on the employer's own hiring board on Oct 26, 2026. First seen by Alion on Oct 23, 2026. Apple scores A on the Alion truth index.
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.
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.
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.
Minimum Qualifications
BS and 10+ 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.
Deep understanding of mobile system fundamentals: concurrency, memory management, and power optimization.
Practical knowledge of how LLM-powered systems work, including agent frameworks and RAG architectures.
Proficiency in AI-assisted development workflows, with experience going beyond simple code suggestions to tackle complex debugging, architectural trade-offs, or automation tasks.
Preferred Qualifications
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).