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JavaScript Virtual Machine Compiler Engineer

Apple

Software and Technology Jobs

JavaScript Virtual Machine Compiler Engineer

full-timePosted: Sep 19, 2025

Job Description

In this role, you have the opportunity to push the state of the art of JavaScript and WebAssembly performance. The JavaScriptCore team at Apple is looking for system programmers with compiler (especially just-in-time) and virtual machine experience. You will be working to deliver a faster and more secure web for all Apple products by improving JavaScriptCore’s already world-class JIT compilers, runtime systems, and the garbage collector. The work is challenging, and the impact is worldwide. Join us. 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 engineers work on all aspects of the engine: the compilation pipeline, the language runtime, the garbage collector, and the API for native apps. The compilation pipeline consists of the parser, the bytecode frontend, profile-guided type profiling, and multiple optimizing compiler backend that turn JS and Wasm programs into efficient ARM and x86 machine code. In this role, you will work across all areas of the engine, improving the performance, security, and stability of the engine, as well as compatibility with other browsers. You will also help guide the evolution of the JavaScript and WebAssembly languages via public standards. You will drive new innovations, add new optimizations, tune performance, implement language features, in addition to diagnosing and fixing existing problems.

Locations

  • Cupertino, California, United States 95014

Salary

Estimated Salary Rangemedium confidence

30,000,000 - 80,000,000 INR / yearly

Source: ai estimated

* This is an estimated range based on market data and may vary based on experience and qualifications.

Skills Required

  • JavaScript programmingintermediate
  • WebAssembly programmingintermediate
  • system programmingintermediate
  • compiler experienceintermediate
  • just-in-time compilationintermediate
  • virtual machine experienceintermediate
  • JIT compilersintermediate
  • runtime systemsintermediate
  • garbage collectionintermediate
  • compilation pipelineintermediate
  • parser developmentintermediate
  • bytecode frontendintermediate
  • profile-guided type profilingintermediate
  • optimizing compiler backendintermediate
  • ARM machine code generationintermediate
  • x86 machine code generationintermediate
  • performance optimizationintermediate
  • security implementationintermediate
  • stability improvementintermediate
  • browser compatibilityintermediate
  • standards guidanceintermediate
  • innovation drivingintermediate
  • language feature implementationintermediate
  • problem diagnosisintermediate
  • problem fixingintermediate

Required Qualifications

  • BS in computer science or equivalent (experience)
  • Experience programming in modern C++ (experience)
  • Excellent debugging, critical thinking, and communication skills (experience)
  • Experience with compilers, parsers, and interpreters (experience)
  • Experience with assembly-level programming (experience)
  • Experience with performance analysis (experience)
  • Experience with memory allocators and garbage collectors (experience)

Preferred Qualifications

  • Hands-on experience with VMs with just-in-time compilers (e.g. JavaScript engines and JVMs) (experience)
  • Experience with web browsers (experience)
  • Knowledge of JavaScript and WebAssembly (experience)

Responsibilities

  • 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 engineers work on all aspects of the engine: the compilation pipeline, the language runtime, the garbage collector, and the API for native apps. The compilation pipeline consists of the parser, the bytecode frontend, profile-guided type profiling, and multiple optimizing compiler backend that turn JS and Wasm programs into efficient ARM and x86 machine code.
  • In this role, you will work across all areas of the engine, improving the performance, security, and stability of the engine, as well as compatibility with other browsers. You will also help guide the evolution of the JavaScript and WebAssembly languages via public standards. You will drive new innovations, add new optimizations, tune performance, implement language features, in addition to diagnosing and fixing existing problems.

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Apple logo

JavaScript Virtual Machine Compiler Engineer

Apple

Software and Technology Jobs

JavaScript Virtual Machine Compiler Engineer

full-timePosted: Sep 19, 2025

Job Description

In this role, you have the opportunity to push the state of the art of JavaScript and WebAssembly performance. The JavaScriptCore team at Apple is looking for system programmers with compiler (especially just-in-time) and virtual machine experience. You will be working to deliver a faster and more secure web for all Apple products by improving JavaScriptCore’s already world-class JIT compilers, runtime systems, and the garbage collector. The work is challenging, and the impact is worldwide. Join us. 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 engineers work on all aspects of the engine: the compilation pipeline, the language runtime, the garbage collector, and the API for native apps. The compilation pipeline consists of the parser, the bytecode frontend, profile-guided type profiling, and multiple optimizing compiler backend that turn JS and Wasm programs into efficient ARM and x86 machine code. In this role, you will work across all areas of the engine, improving the performance, security, and stability of the engine, as well as compatibility with other browsers. You will also help guide the evolution of the JavaScript and WebAssembly languages via public standards. You will drive new innovations, add new optimizations, tune performance, implement language features, in addition to diagnosing and fixing existing problems.

Locations

  • Cupertino, California, United States 95014

Salary

Estimated Salary Rangemedium confidence

30,000,000 - 80,000,000 INR / yearly

Source: ai estimated

* This is an estimated range based on market data and may vary based on experience and qualifications.

Skills Required

  • JavaScript programmingintermediate
  • WebAssembly programmingintermediate
  • system programmingintermediate
  • compiler experienceintermediate
  • just-in-time compilationintermediate
  • virtual machine experienceintermediate
  • JIT compilersintermediate
  • runtime systemsintermediate
  • garbage collectionintermediate
  • compilation pipelineintermediate
  • parser developmentintermediate
  • bytecode frontendintermediate
  • profile-guided type profilingintermediate
  • optimizing compiler backendintermediate
  • ARM machine code generationintermediate
  • x86 machine code generationintermediate
  • performance optimizationintermediate
  • security implementationintermediate
  • stability improvementintermediate
  • browser compatibilityintermediate
  • standards guidanceintermediate
  • innovation drivingintermediate
  • language feature implementationintermediate
  • problem diagnosisintermediate
  • problem fixingintermediate

Required Qualifications

  • BS in computer science or equivalent (experience)
  • Experience programming in modern C++ (experience)
  • Excellent debugging, critical thinking, and communication skills (experience)
  • Experience with compilers, parsers, and interpreters (experience)
  • Experience with assembly-level programming (experience)
  • Experience with performance analysis (experience)
  • Experience with memory allocators and garbage collectors (experience)

Preferred Qualifications

  • Hands-on experience with VMs with just-in-time compilers (e.g. JavaScript engines and JVMs) (experience)
  • Experience with web browsers (experience)
  • Knowledge of JavaScript and WebAssembly (experience)

Responsibilities

  • 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 engineers work on all aspects of the engine: the compilation pipeline, the language runtime, the garbage collector, and the API for native apps. The compilation pipeline consists of the parser, the bytecode frontend, profile-guided type profiling, and multiple optimizing compiler backend that turn JS and Wasm programs into efficient ARM and x86 machine code.
  • In this role, you will work across all areas of the engine, improving the performance, security, and stability of the engine, as well as compatibility with other browsers. You will also help guide the evolution of the JavaScript and WebAssembly languages via public standards. You will drive new innovations, add new optimizations, tune performance, implement language features, in addition to diagnosing and fixing existing problems.

Target Your Resume for "JavaScript Virtual Machine Compiler Engineer" , Apple

Get personalized recommendations to optimize your resume specifically for JavaScript Virtual Machine Compiler Engineer. Takes only 15 seconds!

AI-powered keyword optimization
Skills matching & gap analysis
Experience alignment suggestions

Check Your ATS Score for "JavaScript Virtual Machine Compiler Engineer" , Apple

Find out how well your resume matches this job's requirements. Get comprehensive analysis including ATS compatibility, keyword matching, skill gaps, and personalized recommendations.

ATS compatibility check
Keyword optimization analysis
Skill matching & gap identification
Format & readability score

Tags & Categories

Hardware

Answer 10 quick questions to check your fit for JavaScript Virtual Machine Compiler Engineer @ Apple.

Quiz Challenge
10 Questions
~2 Minutes
Instant Score

Related Books and Jobs

No related jobs found at the moment.