JavaScriptCore Security Engineer

Apple • Operating Systems • Laptops • Bachelor's Degree • JavaScript • C++ • 5 hours ago
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Salary
≈ $199k – $448k per year (Estimated)
Location
In office (Cupertino)
Visa
H-1B filings in 12 months: 6,350 · for this role: 2,720 · green card filings: 37

Confirmed on the employer's own hiring board on Oct 21, 2026. First seen by Alion on Nov 14, 2025. Apple scores A on the Alion truth index.

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Apple

Apple is an American multinational technology company founded in 1976 by Steve Jobs, Steve Wozniak and Ronald Wayne, and headquartered in Cupertino, California. It designs and sells consumer hardware including the iPhone, Mac, iPad, Apple Watch, AirPods and Vision Pro, together with the operating systems and silicon that run them. A growing services division built around the App Store, iCloud, Apple Music, Apple TV+ and Apple Pay now contributes a large share of profit, making Apple one of the most valuable companies in the world.
apple.com • HQ: Cupertino, United States • Smartwatches & Fitness Trackers • Operating Systems • Tablets • Laptops • Smartphones • 5000+ employees • Est. 1976
Tech stack of Apple

In this role, you have the opportunity to help secure the JavaScriptCore virtual machine. The JavaScriptCore team at Apple is looking for system programmers with experience in security, especially in programming languages, compilers, and virtual machines. You will be working to deliver a more secure web for all Apple products both proactively, by ensuring new features are implemented securely, and reactively, by responding to and addressing JavaScriptCore’s unique security challenges. The work is challenging, and the impact and reach are large. Join us!

Description

The JavaScriptCore team in WebKit is responsible for the JavaScriptCore engine, and our mission is to make JavaScript and WebAssembly execution both fast and secure. JavaScriptCore is complex, with many subsystems: the compilation pipeline, the language runtime, the garbage collector and memory allocators, and the API for native apps. These subsystems run untrusted, third-party code, and all of them must do so in a memory safe way.

In this role, you will work across all areas of the engine, focusing on improving security and stability. You will drive new innovations in the security architecture of the codebase. You will fix security issues and respond to fuzzing. You will also ensure that security processes in JavaScriptCore are updated to current best practices and set the project up for a secure future.

Minimum Qualifications

BS in computer science or equivalent

Experience programming in modern C++

Excellent debugging, critical thinking, and communication skills

Experience developing privacy and security-sensitive software

Experience with compilers, parsers, and interpreters

Experience with assembly-level programming

Preferred Qualifications

Hands-on experience with VMs with just-in-time compilers (e.g. JavaScript engines and JVMs)

Experience with web browsers

Experience with memory allocators and garbage collectors

Experience with fuzzing, security architecture, and memory safety

Knowledge of JavaScript and WebAssembly

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