Siri Runtime Platform Software Engineer, Siri Core Modeling
Apple
Software Engineering
Cupertino, CA, USA
USD 147,400-272,100 / year + Equity
Posted on Feb 7, 2026
Join the Siri Runtime Platform team and help shape the future of Apple Intelligence. We are engineers, scientists, and problem solvers working to bring smarter, faster, and more natural interactions to millions of users worldwide. As a Software Engineer on our team, you will build the on-device runtime foundation that powers Siri, enabling seamless, intelligent, and secure user experiences. This is an opportunity to collaborate with a passionate, diverse group of cross-functional partners to deliver the next generation of innovative features across the Apple ecosystem.
In this role, you will be at the forefront of integrating Apple Intelligence into Siri. You will design and implement new features, optimize system performance for low-latency interaction, and help integrate intelligent experiences into people’s daily lives. You will work closely with engineers across Siri and the wider Apple organization to create scalable, efficient, and user-focused solutions that leverage the latest advancements in Large Language Models (LLMs) and on-device intelligence.
- Design, develop, and maintain the robust on-device runtime platform for Siri.
- Implement scalable, maintainable, and highly testable code, ensuring best practices in engineering.
- Debug, optimize, and profile system performance to ensure high-quality, responsive interactions.
- Apply LLMs and on-device intelligence to enhance Siri’s capabilities, collaborating with cross-functional teams to ship new experiences.
- Leverage GenAI-based tooling to enhance engineering productivity, code quality, and efficiency at scale.
- BS or MS in Computer Science or equivalent practical experience.
- Strong proficiency in C++, Swift, or Objective-C, with a solid understanding of object-oriented programming.
- Strong understanding of OS internals, concurrency, multithreading, and memory management.
- Experience utilizing GenAI and LLM-based tools to accelerate engineering tasks (e.g., code generation, testing, or system analysis).
- Experience with system performance analysis and optimization techniques.
- Ability to work independently, solve complex problems, and learn new technologies quickly.
- Excellent communication skills, with experience collaborating across different technical teams.
- Proven professional experience designing, developing, and shipping high-quality production software.
- Proficiency with Swift and Xcode, with experience building applications for Apple platforms.
- Exposure to on-device development workflows (e.g., debugging tools, memory profiling, performance optimization).
- Experience working on voice assistants or conversational AI systems leveraging Large Language Models (LLMs).
- Experience with API design or framework development.
Apple is an equal opportunity employer that is committed to inclusion and diversity. We seek to promote equal opportunity for all applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, Veteran status, or other legally protected characteristics. Learn more about your EEO rights as an applicant.