Apple

Apple

Posted via Apple Careers

JavaScriptCore Security Engineer

Always Hiring

Posted Aug 4, 2026

Role at a glance

Salary
$150.4K – $277.6K/yr
Location
Cupertino, California, United States
Work arrangement
On-site
Employment
Full-time
Experience
Experience developing privacy and security-sensitive software
Education
BS in computer science or equivalent

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Role Summary

AI-generated

The JavaScriptCore team in WebKit develops the JavaScriptCore engine, supporting fast and secure JavaScript and WebAssembly execution across Apple products. This role focuses on improving the engine’s security and stability across its compilation pipeline, language runtime, garbage collector, memory allocators, and native-app API.

What You'll Do

  • Improve security and stability across all areas of the JavaScriptCore engine
  • Drive new innovations in the security architecture of the codebase
  • Fix security issues
  • Respond to fuzzing
  • Ensure JavaScriptCore security processes are updated to current best practices

Generated from the employer's posting. Verify important details before applying.

View full posting

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

Required

  • 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

  • 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

Original job description

Content provided by the employer

Summary

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

Pay & Benefits — Cupertino, California, United States

At Apple, base pay is one part of our total compensation package and is determined within a range. This provides the opportunity to progress as you grow and develop within a role. The base pay range for this role is between $150,400 and $277,600, and your base pay will depend on your skills, qualifications, experience, and location.

Apple employees also have the opportunity to become an Apple shareholder through participation in Apple’s discretionary employee stock programs. Apple employees are eligible for discretionary restricted stock unit awards, and can purchase Apple stock at a discount if voluntarily participating in Apple’s Employee Stock Purchase Plan. You’ll also receive benefits including: Comprehensive medical and dental coverage, retirement benefits, a range of discounted products and free services, and for formal education related to advancing your career at Apple, reimbursement for certain educational expenses — including tuition. Additionally, this role might be eligible for discretionary bonuses or commission payments as well as relocation. Learn more about Apple Benefits

Note: Apple benefit, compensation and employee stock programs are subject to eligibility requirements and other terms of the applicable plan or program.

Application Deadline

Apple accepts applications to this posting on an ongoing basis.

Apple

About the company

Apple

Large Enterprise

Apple Inc. is a global technology company known for its innovative products and services, including the iPhone, iPad, Mac computers, and Apple Watch. Founded in 1976, Apple has continuously pushed the boundaries of design and functionality, earning a reputation for high-quality consumer electronics and software solutions like iOS and macOS. With a strong commitment to user experience and privacy, Apple also leads in digital services, offering platforms such as the App Store, Apple Music, and iCloud. The company's focus on sustainability and corporate responsibility further enhances its standing as a leader in the technology sector.