Jobs in the United States

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Added 1 min ago
Energy Coach II
TRC Companies, Inc.
Portland, OR
TRC, Member of WSP, is a global consulting environmental and engineering firm and one of the top design firms in the energy sector. Together, TRC and WSP’s 83,000 experts create positive,…
Added 1 min ago
Associate Outreach Consultant
TRC Companies, Inc.
Melville, NY
TRC, Member of WSP, is a global consulting environmental and engineering firm and one of the top design firms in the energy sector. Together, TRC and WSP’s 83,000 experts create positive,…
Added 1 min ago
TC
Environmental Intern
TRC Companies, Inc.
New Providence, NJ
- $20 to $28 USD / hour
TRC has long set the bar for clients who require more than just engineering, combining science with the latest technology to devise innovative solutions that stand the test of time. From…
Added 1 min ago
Project Manager
TRC Companies, Inc.
Chicago, IL
TRC, Member of WSP, is a global consulting environmental and engineering firm and one of the top design firms in the energy sector. Together, TRC and WSP’s 83,000 experts create positive,…
Added 1 min ago
Product Marketing Lead
TRC Companies, Inc.
Denver, CO
TRC, Member of WSP, is a global consulting environmental and engineering firm and one of the top design firms in the energy sector. Together, TRC and WSP’s 83,000 experts create positive,…
Added 1 min ago
Lead GIS Consultant
TRC Companies, Inc.
Ann Arbor, MI
Esri ArcGIS Utility Network certification is required
Added 2 mins ago
J
Senior Marketing Operations Engineer
Jobgether
Remote, United States
- $149,000 to $195,000 USD / year
…solutions that improve efficiency and decision-making. You will design and optimize marketing attribution models, reporting systems, lifecycle processes, and AI-powered workflows. This…
Added 2 mins ago
CAD Designer (Behind-The-Meter Power Infrastructure)
Tract Capital Management, LP
Alexandria, VA · Denver, CO · Seattle, WA
Support drawing development from concept and basis of design through design development, construction documents, commissioning, and as-built turnover.
Added 6 mins ago
SO
Senior Solutions Engineer (SASE) - TRANSPARENCY POSTING
State of Colorado
CO
- $110,000 to $125,000 USD / year
Provide technical guidance throughout the technology lifecycle, including discovery, requirements, design, development, testing, implementation, and maintenance.
Added 6 mins ago
Software Engineer II, Fintech
Twitch
San Francisco, CA
Twitch's Enterprise Platform & Technology (EPT) organization is looking for a Software Development Engineer II to build agentic AI systems on AWS that power Finance and enterprise functions…
Added 10 mins ago
Software Development Engineer - US Federal
Workday Government, LLC
United States
Our Product Development and QA organization spans across various products, serving a wide range of customers worldwide. Every project you undertake with us contributes to Workday's…
Added 11 mins ago
Solution Architect, Global Supply Chain
Roche
Indianapolis, IN
Architectural Blueprinting: Design and govern the end-to-end technical architecture for warehouse operations, integrating ERP, WMS, and automated data monitoring tools.
Added 14 mins ago
Darwin Runtime Engineer, Core OS
Apple
Cupertino, CA
…the intersection of operating systems, programming language design, systems security, and high-performance computing. As a Software Engineer on the team, you'll work closely with kernel…
Added 14 mins ago
Global Supply Manager (GSM) - Mechanical Enclosures - Brittles
Apple
TX · CA
…innovation that runs through everything we do, from amazing technology to industry-leading environmental efforts. Join Apple, and help us leave the world better than we found…
Added 14 mins ago
Information Systems Security Manager / Specialist
Node.Digital
Arlington, VA
Must have an active Top Secret Clearance · - Must have an active TS/SCI clearance
Added 14 mins ago
Full Stack Developer/ Application Developer
Node.Digital
Dulles, VA
Must have an active Public Trust Security Clearance
Added 21 mins ago
Scientist, Systems Engineer
L3Harris Technologies
Chantilly, VA
Sufficient background in proposed technology to be capable of assessing high level performance requirements
Added 26 mins ago
SO
DSHS FTAA Data Science & Informatics Specialist 1
State of Washington
Olympia, WA
- $86,688 to $116,544 USD / year
In addition to the qualifications above, applicants must have at least one (1) year of experience in each of the following areas:
Added 30 mins ago
RC
Sr. GIS Analyst
RIVUS Consulting LLC
Lanham, MD
- $95,000 to $120,000 USD / year
RIVUS Consulting LLC is a multidisciplinary small business providing engineering, environmental, management, and technology consulting services to federal, state, and municipal clients.…
Added 31 mins ago
Data & Applications Engineer (Internal Candidates Only)
Washington Education Association
Federal Way, WA
…leadership on data and application platform strategy, planning, and design. This position also partners with staff across WEA who build, maintain, and use these applications and reports.…
Added 33 mins ago
ASIC Digital Design Engineer-Principal-18710
Synopsys
Austin, TX
An experienced and visionary ASIC Digital Architect, who is passionate about driving the future of semiconductor technology. You possess deep functional knowledge and expertise in design…
Added 33 mins ago
ASIC Design Engineer, Architect-18711
Synopsys
Austin, TX
An experienced and visionary ASIC Digital Architect, who is passionate about driving the future of semiconductor technology. You possess deep functional knowledge and expertise in design…
Added 33 mins ago
Executive Director SOC Physical Design
Synopsys
Sunnyvale, CA
At Synopsys, we drive the innovations that shape the way we live and connect. Our technology is central to the Era of Pervasive Intelligence - from self-driving cars and artificial…
Added 36 mins ago
WF
Head of Partner Marketing
Wispr Flow
San Francisco, CA
- $240,000 to $260,000 USD / year
…and caring about the final human experience as deeply as the technology underneath…
Added 37 mins ago
Senior, Data Scientist | Fraud & Risk Team | Sunnyvale
Walmart Inc.
United States
Design, build and implement predictive models with high-dimensional, fast moving real time datasets.

Darwin Runtime Engineer, Core OS

Cupertino, CA, United States

The base pay range for this role is between $129,300 and $225,300, and your base pay will depend on your skills, qualifications, experience, and location.

Apply on jobs.apple.com About employer

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Job details

Pay: The base pay range for this role is between $129,300 and $225,300, and your base pay will depend on your skills, qualifications, experience, and location.
Experience: 0-3+ years of relevant industry experience in low level systems programming
Posting language: English
Posted: Nov 10, 2026

Original job description

Summary The people here at Apple don’t just build products, we build the kind of wonder that revolutionise entire industries. Imagine what you could do here! Do you have a passion for understanding how each line of code affects all the others? In the Core Operating Systems group ensuring the OS is inseparable from each device’s identity as a whole. That’s because this group is committed to building fully integrated operating systems that combine hardware, software, and apps into a single Apple experience. Your dedication to cross-disciplinary collaboration will help develop groundbreaking technologies, such as iOS, macOS, watchOS, and tvOS. By crafting these distinct, complete user experiences, you’ll continue to uphold and advance the excellence people expect from Apple devices! The Darwin Runtime team in Core OS is looking for enthusiastic engineers interested in developing low-level system technologies for Apple’s operating systems.

Description The Darwin Runtime team is responsible for building the low-level runtime technologies like Grand Central Dispatch (GCD), secure inter-process communication systems, memory allocator, threading library, and concurrency and synchronization primitives. The team operates at the intersection of operating systems, programming language design, systems security, and high-performance computing. As a Software Engineer on the team, you'll work closely with kernel engineers, security architects, and framework developers to deliver foundational technologies that enable Apple's next-generation computing platforms.The ideal candidate should be self-motivated and effective in operating independently, with a desire to learn and develop technical leadership. Team members are welcome and encouraged to participate in design discussions, code reviews, and development across multiple technologies. Our environment fosters technical innovation, meaningful technology ownership, and a liberating amount of autonomy.

Responsibilities

You will be responsible for working on a range of technologies that form the foundation of Apple’s operating systems. The work would include responsibilities such as: Design and implement new features and APIs for Darwin Runtime technologies like GCD, XPC, pthread, and malloc Design and implement IDL compiler frontend and backend systems, including lexical analysis, parsing, semantic analysis, and code generation for both C and Swift targets Develop and maintain high-performance runtime libraries that handle secure communication, memory management, and component lifecycle across different execution environments Optimize code generation, runtime performance, and memory usage to meet strict performance requirements for low-level systems

An engineer in the Secure Runtime team would regularly:

Participate in all phases of software development cycle: from problem definition and design, through implementation, testing, and debugging Diagnose and resolve issues across different layers of the stack Work with cross functional teams to enable developer and product requirements

Minimum Qualifications BS or MS in Computer Science or equivalent degree 0-3+ years of relevant industry experience in low level systems programming Passion for low-level system technologies Fluency in the C programming language Experience with UNIX-like systems System design and architecture skills Strong understanding of operating system fundamentals like threading, synchronization primitives, inter-process communication, scheduling, and virtual memory Excellent collaborative skills, with the ability to work with a team to design system architecture

Preferred Qualifications Experience with compiler design, including lexical analysis, parsing, semantic analysis, and code generation Knowledge of capability-based security models, sandboxing, and secure IPC mechanisms Knowledge of operating system implementation, hardware architecture and assembly programming Knowledge of Swift or Objective-C Skilled at interface and/or API design Experience with lldb or gdb

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 $129,300 and $225,300, 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.

EEO Statement Apple is an equal opportunity employer that is committed to inclusion and diversity. We seek to promote 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

Accessibility At Apple, we believe accessibility is a fundamental human right. You’ll find that idea reflected in everything here - in our culture, our benefits and our digital tools. By welcoming as many perspectives as possible, we help you build a career where you feel like you belong.

Learn about accessibility in Apple’s workplace

Learn about reasonable accommodations for job applicants

Application Deadline Apple accepts applications to this posting on an ongoing basis.

Apply on jobs.apple.com About employer

More about this job

Skills

Oracle Darwin
Apple macOS
Communication skills
Leadership
IDL
C
Swift
Debugging
Computer science
UNIX
Scheduling
Assembly
Objective C
API development

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Work requirements

Jobs in the United States