8 hours ago
Cupertino, CA, USAMid Level
H1B sponsor
Responsibilities
- Build and maintain the agent harness that runs the agent loop, manages context and tools, executes tool calls, and streams results.
- Support multi-step tasks across apps, including interruption handling and clean task resumption.
- Optimize real-time systems for latency, memory, power, and reliability across Mac, iPhone, and Apple Watch.
- Diagnose stalled streaming responses and failures involving models, context, or runtimes.
- Use evaluations to measure and improve LLM and agent behavior.
- Take features from design through production while growing ownership of the core runtime.
- Collaborate with modeling, tools, context, app, framework, and research teams.
Requirements
- Bachelor's degree in Computer Science or a related field.
- 2+ years of industry experience.
- Strong programming skills in a systems language such as Swift, C++, Rust, Objective-C, or Go.
- Strong foundation in concurrency, inter-process communication, and performance optimization.
- Hands-on experience building LLM-powered systems such as agents, tool calling, or prompt and context design through professional work or substantial personal projects.
- Daily use of agentic coding tools such as Claude Code, Codex, or Pi, with informed opinions about effective harness design.
- Clear communication skills and ability to make progress on ambiguous problems.
- Preferred experience with Swift, Apple platform development, agent harnesses, orchestration frameworks, multi-step tool-use systems, model inference integration, streaming protocols, latency-sensitive client-server systems, LLM evaluations, and APIs or platforms used by other engineering teams.
- Preferred familiarity with privacy and security engineering in production systems and current research in context engineering, tool use, and long-horizon agents.
Categories
About Apple
Apple designs and sells consumer electronics, software, and services for consumers and professionals worldwide, including iPhone, Mac, iPad, Apple Watch, and AirPods, plus platforms like iOS/macOS and services such as the App Store, iCloud, Music, and TV+. Its business combines device sales with services and subscriptions and in-house silicon design. Founded in 1976, Apple is headquartered in Cupertino, California, and trades on NASDAQ as AAPL.