Apple
Designs and sells hardware and software
Cellular 4G/5G System Performance Engineer
More locations: San Diego, CA, USA
About the job
- A bachelor's degree is required.
- Knowledge of 4G/5G physical layer, protocol stack, and procedures is required.
- Knowledge of 4G/5G development, system engineering, and device performance verification is required.
- Experience investigating and troubleshooting cellular device performance issues is required.
- Ability to analyze and debug performance issues and work with firmware development and systems design teams to resolve them is required.
- Understanding of software engineering principles and core computer science fundamentals is required.
- Ability to script or program in Python or C/C++ is required.
- Experience with multiple 4G/5G signaling and physical layer test equipment, including Keysight, Anritsu, and Rohde & Schwarz, and their automation interfaces is required.
- Collaborate with system engineers and firmware developers to understand system design, feature design, and firmware implementation details.
- Design performance-verification laboratory use cases and test cases to identify potential user-equipment performance issues and ensure overall user-equipment performance meets expectations.
- Collaborate with system engineers, firmware developers, integration engineers, and test engineers to troubleshoot performance-related issues and enhance overall user-equipment performance.
- Develop test scripts over a laboratory network emulator to implement defined performance test cases or reproduce issues.
- Guide test executors in validating new and existing features.
- A master's or PhD degree in wireless communication or electrical engineering.
- Advanced knowledge of 4G/5G physical layer, protocol stack, and procedures.
- Experience investigating and troubleshooting cellular device performance issues.
- Strong analysis and debugging capabilities to diagnose performance issues and collaborate with firmware development and systems design teams to resolve them.
- Deep understanding of software engineering principles and core computer science fundamentals.
- Proficiency in Python, C/C++, and Java, with a solid grasp of the automation toolchain.
- Extensive experience with 4G/5G signaling and physical layer test equipment, including Keysight, Anritsu, and Rohde & Schwarz, and their automation interfaces.
- Knowledge of Layer 2, Layer 3, NAS, and network performance optimization.
- Experience with network emulators, silicon prototyping, emulation systems, and virtual platforms.
About the company
Apple designs, manufactures, and sells hardware and software across iPhone, iPad, Mac, Apple Watch, and Apple TV, plus services like the App Store, Apple Music, iCloud, and Apple Pay. The products work together through an integrated ecosystem where devices run Apple’s own operating systems and sync data via iCloud, delivering a seamless user experience. It differentiates itself by controlling both hardware and software end-to-end, maintaining a unified design, and expanding services and spatial computing. Its goal is to provide a cohesive, high-quality experience across devices while growing services revenue and expanding its ecosystem.
Company Size
10,001+
Company Stage
IPO
Headquarters
Cupertino, California
Founded
1976
Get referred to Apple
See people who can refer or advise you
Simplify's Take
What believers are saying
- Apple shipped iPhone 18 Pro, Watch Series 12, and AirPods 5 worldwide September 18, 2026.
- The iPhone Duo starts at $1,999, expanding Apple’s average selling price immediately.
- Mac Studio’s M5 Ultra targets enterprise AI workloads, reducing dependence on Nvidia cloud GPUs.
What critics are saying
- Taction’s September 26, 2026 $5.7 billion verdict threatens Taptic Engine economics across devices.
- China pricing and Huawei’s 22.6% smartphone share pressure Apple’s premium iPhone Duo adoption.
- A prolonged App Store or hardware legal setback could compress margins and delay launches.
What makes Apple unique
- Apple’s M5 Ultra Mac Studio runs enormous LLMs locally with 512GB unified memory.
- John Ternus launched iPhone Duo on September 9, 2026, extending Apple’s premium hardware moat.
- Apple controls silicon, software, and services, bundling Apple Intelligence, iOS 27, and App Store.
Help us improve and share your feedback! Did you find this helpful?
Benefits
Health Insurance
Dental Insurance
401(k) Retirement Plan
401(k) Company Match
Tuition Reimbursement
Performance Bonus
Relocation Assistance
Employee Stock Purchase Plan
Growth & Insights and Company News
6 month growth
↑ 0%1 year growth
↑ 0%2 year growth
↓ -5%Microsoft and Apple are competing for leadership in the AI era while offering investors different value propositions. Microsoft trades at 25x forward P/E versus Apple's 38x, below the sector average of 35x. Microsoft's sales grew 17.7% year-over-year to $90 billion, whilst Apple's rose 16.4% to $109.4 billion. Microsoft retained nearly 40% of revenue as income compared to Apple's 27%. However, Apple's return on equity reached 135% versus Microsoft's 32%. For dividends, Microsoft offers a 0.76% yield with a 20.53% payout ratio, whilst Apple yields 0.32% with a 12.11% payout ratio, giving both room for increases. Analysts rate Microsoft a "strong buy" with 35% upside potential, whilst Apple receives a "moderate buy" rating with 17% upside.
A US jury has ordered Apple to pay $5.7 billion in a patent case concerning haptic technology, marking the largest patent award in American history. The amount represents approximately 4.5% of Apple's annual profit of $129 billion. Apple plans to appeal the verdict. Patent awards of this magnitude are frequently reduced on appeal, and the appeals process can take years. The jury did not find willful infringement, which would have allowed damages to be multiplied. The case involves haptic feedback technology embedded across Apple's product line, including phones, watches, and trackpads. This makes design workarounds more challenging than if the patent covered a single component. At the end of Q2 2026, 169 hedge funds held Apple shares worth $124.8 billion, down from 170 funds the previous quarter.
Michael Burry, the hedge fund manager who predicted the 2008 financial crisis, has warned that AI companies are hiding $3 trillion in data centre debts that could destabilise the global economy. Burry's analysis of regulatory filings reveals Apple, Google, Microsoft, Meta and Oracle have accumulated massive off-balance-sheet obligations. The five companies have signed $1.2 trillion in data centre leases, with at least $857 billion non-cancellable, plus over $1.5 trillion in supply chain purchase commitments. These liabilities don't appear on their balance sheets under current accounting rules. Burry warns this could reach $5 trillion by 2028. With combined annual earnings under $400 billion, Burry questions what happens if AI growth disappoints. Oracle, Microsoft and Meta shares have already fallen from recent peaks.
Bank of America strategist Michael Hartnett, who coined "Magnificent 7" in May 2023, warns the tech giants' defining strength has become a weakness. The group—Apple, Amazon, Alphabet, Meta, Microsoft, Nvidia, and Tesla—initially attracted investors seeking alternatives to government bonds during fiscal excess. However, massive AI spending has transformed their financial profile. Global AI investment is expected to exceed $1 trillion in 2026, with hyperscalers now spending similar amounts annually. The companies have become cash-flow negative by $200 billion and increasingly reliant on corporate credit markets. With 10-year Treasury yields near two-decade highs and 30-year yields exceeding 5.5%, rising borrowing costs directly threaten the AI spending that drives their growth. Hartnett notes they've become "subservient to the bond market"—the very asset class they once served as a hedge against.
Apple's iPhone Duo faces a lukewarm reception in China, where it is priced at 15,999 yuan (approximately $2,230), positioning it above Xiaomi's 18 Fold at 10,999 yuan but below Huawei's Mate XT2 at 19,999 yuan. Chinese social media users noted the device represents a heavier financial burden relative to local incomes compared to its $1,999 US price for American consumers. Huawei controlled 68% of Chinese foldable shipments in the second quarter, whilst leading China's overall smartphone market with a 22.6% share versus Apple's 18.1%. However, Apple ranked second after its shipments jumped 24.4% year over year. Omdia expects global foldable smartphone shipments to reach 22.3 million units in 2026, with Counterpoint projecting Apple to sell close to 6 million Duo units by year-end.