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Apple

Sr. WebKit Performance Engineer

San Diego, CA$175,000 – $308,500Posted Oct 10, 2026

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The WebKit Performance team is looking for an engineer with a passion for software optimization to support one of the most heavily used frameworks and applications in the world.

WebKit is the system framework for rendering web content on Apple platforms. When you load a webpage in Safari, that's WebKit! WebKit is also an Open Source software project in which Apple engineers collaborate with engineers from around the world to improve the framework, evolve web APIs, and ensure the best possible experience on the web. WebKit is a foundational component of iOS, macOS, watchOS, tvOS, and visionOS, forming the basis of many key applications.

Performance improvements in WebKit make all of our products better. The WebKit Performance team is responsible for defending and improving the launch speed, processing speed, memory size, and power consumption of the WebKit framework. You will help improve WebKit performance on all Apple platforms.

Description

As a WebKit Performance Engineer, you will seek opportunities to improve WebKit performance as measured by execution time, memory consumption, and power use. You will also be responsible for diagnosing performance issues identified in benchmarks and in web applications, helping us identify and correct recent performance regressions, and helping to train and mentor others in performance improvement techniques.","responsibilities":"Investigating cases of poor performance in WebKit-based applications Identifying performance bottlenecks and hot-spots in the WebKit framework.

Creating and defending performance benchmarks covering important web technologies.

Working across teams at Apple to drive improvements in core frameworks.

Interacting with developers on the Open Source WebKit project.

Preferred Qualifications

At least 4 years of prior hands-on iOS or macOS application development.

Experience with Objective-C, Swift, and Cocoa APIs.

Experience with web technologies (HTML, CSS, JavaScript, SVG, WebGL, WebGPU).

Experience with UIKit and AppKit.

Excellent debugging, analysis, communication, and critical thinking skills.

Minimum Qualifications

BS in Computer Science or equivalent work experience.

Expertise in C++.

Experience with software performance measurement, analysis, and optimization.

Detailed understanding of data structures and algorithms.

Experience with pointers, memory management, threads, and processes.

Pay & Benefits

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 $175,000 and $308,500, 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.

About Apple

Working at Apple means doing more than you ever thought possible and having more impact than you ever imagined.

Size: 10,000+ employees
Industry: Technology

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