5G/4G Cellular Layer1 Control Firmware Engineer Sunnyvale,California,United States Hardware Do you have a passion for invention and self-challenge? Do you thrive on pushing the limits of what’s considered feasible. As part of a world class modem team, you’ll craft sophisticated groundbreaking embedded firmware that deliver more performance in our products than ever before. You’ll work across fields to transform improved hardware elements into a single, integrated design. Join us, and you’ll help us innovate new cellular technologies that continually outperform the previous iterations! By collaborating with other product development groups across Apple, you’ll push the industry boundaries of what wireless systems can do and improve the product experience for our customers across the world. Do you want to have an impact on every single Apple product? As a Cellular Layer 1 Control Firmware Engineer in the L1S team, you will be at the core of embedded 5G/4G/multimode cellular firmware development within a silicon design group responsible for creating and productizing advanced cellular SoCs. This role requires expertise in all aspects of embedded software development, the ability to thrive in a dynamic, cross-functional environment, openness to debating ideas, and flexibility to adapt to constantly evolving requirements. **Description** Design, implement and verify Cellular Layer 1 control firmware for an innovative mobile wireless communications system. Develop key scheduling and control algorithms, while meeting strict deadlines, and optimizing code for cycle, latency, and energy efficiency. Collaborate with global teams and colleagues to optimize solutions. Collaborate with other firmware and software designers to define interfaces with RF, physical layer, MAC/RRC, and other required processor subsystems. Study firmware operation timelines, and interactions with different components and make enhancements when necessary. **Minimum Qualifications** + BS and 10+ years of relevant industry experience. + Understanding of software engineering principles and core computer science fundamentals. + Proficiency in C programming, and source code control tools. + Experience in bare metal embedded FW development or Real-Time Operating Systems (RTOS) and parallel computing. + Hands-on experience in wireless/cellular/satellite software or firmware development. **Key Qualifications** **Preferred Qualifications** + MS or PHD and 5+ years of relevant industry experience. + Solid understanding of computer architecture with particular emphasis on the HW/SW interfaces of high-speed communication subsystems. + Familiar with 4G/5G procedures such as RACH, CDRX, RF Control, SAR and RF Power control, Measurements, time tracking and maintenance, MAC Timers. + Understanding of Multi Sim Operation. + Digital signal processing and/or radio communications knowledge. + Experience with silicon prototyping, emulation systems, and virtual platforms. **Education & Experience** **Additional Requirements** **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 $175,800 and $312,200, 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 (https://www.apple.com/careers/us/benefits.html) 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. (https://www.eeoc.gov/sites/default/files/2023-06/22-088\_EEOC\_KnowYourRights6.12ScreenRdr.pdf) **Apple Footer** Apple is an equal opportunity employer that is committed to inclusion and diversity. 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