Senior Modem System Test Engineer

Join the Wireless Technologies and Ecosystems (WTE) team and be part of a best-in-class team of engineers, working with multi-functional teams to drive innovation and develop products used by millions worldwide. We are looking for a highly reciprocal individual who can excel in a high-paced environment. Be ready to make something extraordinary when you come here. Dynamic, encouraging people and innovative, industry-defining technologies are the norm at Apple. The people who work here have reinvented and defined entire industries with our products and services. The same real passion for innovation also applies to our business practices - strengthening our dedication to leave the world better than we found it. You should join Apple if you want to help deliver the next amazing Apple product.

Description

The candidate is expected to be hands-on, relying on diagnostics, analytics, lab/test equipment experimentations, as well as code/architecture reviews to explore opportunities for improvement. You will work cross-functionally with platform architecture, standardization, firmware/protocol development, system test, and carrier engineering teams to drive improvement proposals and baseband optimizations. Our team members enjoy the flexibility to be involved in all aspects of protocol software-PHY, RF, SIM, NAS, AS, IP, TCP/UDP, and iOS interfaces-to ensure the most robust and customer-friendly software. If you are passionate about cellular technologies, we are looking for you As part of this team, you will directly impact the iPhone user experience in 100+ countries by engaging in continuous process improvements for well-tested and robust software. This position involves defining and developing new test scenarios to exercise different aspects of 4G/5G cellular modems, executing tests, analyzing results and failures, and identifying issues and optimizations to improve user experience.

Responsibilities

• Lead modem system-level validation for various features, own test strategy, planning, and execution across TE (Test equipment), OTA, and carrier drop testing.
• Collaborate with platform architecture, standards, firmware/protocol, system test, and carrier teams to influence design and performance.
• Design and deploy ML-driven workflows for real-time anomaly detection, predictive failure analysis, automated test selection/prioritization, and test case generation.
• Define and develop advanced test-automation frameworks, create test scripts, and execute end-to-end test flows to validate the impact of features across all protocol layers (PHY, RF, NAS, AS).
  Provide system-level insights and validation feedback to guide modem feature design, optimization, and cross-functional alignment with deep system expertise.

Minimum Qualifications

• 5+ years in wireless modem validation, system integration/interoperability testing, or cellular certification.
• Solid understanding and experience with the 5G NR radio interface, PHY and MAC layer features/functions, as well as RRC layer control and user plane functions.
• Experience defining, developing, and validating cellular modem system test cases for mobile devices using popular test development platforms (Anritsu, R&S, Anite, Keysight).
• Advanced scripting/automation skills (Python, JavaScript) with scalable framework design.
• Broad knowledge and understanding of the end-to-end wireless system architecture, from the physical layer through to the application layer.

Preferred Qualifications

• Bachelor's or Master's in Computer Science, Electronics & Communication, Telecommunications, or a related field.
• Good understanding of mmWave challenges and 5G standalone protocol.
• Proven experience deploying ML workflows in modem test pipelines.
• Experience in MSIM, MIMO/beamforming, SA/NSA low-coverage mobility, and FR2 is a plus.
• Strong attention to detail on aspects that are significant to customers.
  Consistent track record of independently leading a complete area of technology and driving product quality while working with cross-functional teams.

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