JavaScript Virtual Machine Compiler Engineer

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Do you have a passion for crafting fast software, or squeezing out every last bit of performance that hardware can afford? Are you energized by competition in industry to deliver the best product possible? Are you undaunted by challenges that others claim to be impossible only because they failed at it? Do you have an itch to mix your creativity with your engineering and logic skills to solve difficult problems and deliver innovative features? If so, this role may be for you. In the JavaScriptCore team at Apple, we work on a world class virtual machine which delivers bleeding edge performance in JavaScript and WebAssembly. We’re looking for a virtual machine compiler engineer to join us in our mission to make the web even faster. You’ll get to work with smart and passionate people who will challenge you to be the best engineer you can be. And last but not least, you’ll get to work on products that delight and inspire millions of Apple customers every single day, including your friends and family.
The WebKit JavaScript Virtual Machine is responsible for executing JavaScript and WebAssembly code found in web pages. It uses type inference, dynamic compilation, and sophisticated compilation optimizations to turn JavaScript programs into efficient machine code on X86 and ARM. JavaScript Virtual Machine engineers work on all aspects of the compilation pipeline, including the parser and lexical analysis, the profile-guided type inference, and the optimizing compiler backend. They also own and maintain the language runtime, the garbage collector, and the JavaScriptCore API for native apps. As a JavaScript Virtual Machine Engineer you will work as a generalist in these areas, diagnosing and fixing performance, stability, standards compliance, and compatibility issues, implementing new language features, and supporting browser and non-browser JavaScript clients.
  • BS in computer science or equivalent
  • Detailed knowledge of C and C++
  • Excellent debugging, critical thinking, and communication skills
  • Detailed understanding of data structures and algorithms
  • Experience with compilers, parsers, and interpreters
  • Experience with assembly-level programming
  • Detailed knowledge of the JavaScript language
  • Detailed knowledge of the WebAssembly language
  • Knowledge of best practices in embedded software security
  • Experience with garbage collectors
  • Experience with performance analysis
  • Experience with open source software development
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 $121,900 and $214,500, 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.

Apple is an equal opportunity employer that is committed to inclusion and diversity. We take affirmative action to ensure 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.

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