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Modem System Test Engineer - Wireless Technologies and Ecosystems

Apple· Software and Services
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Sunnyvale, CA$129.3k - $225.3kFull-timePosted 4w ago

About the role

Join Apple’s Wireless Technologies and Eco-Systems (WTE) team to drive innovation in cellular technologies (5G NR, LTE) through hands-on system testing, diagnostics, and cross-functional collaboration to enhance iPhone user experience across 100+ countries.

Responsibilities

  • Test Design & Execution: Define, develop, and execute system-level test plans exercising 5G NR (FR1 & FR2/mmWave) and emerging standards across protocol control/user planes (L1/L2/L3) and physical-layer performance
  • Root-Cause Analysis: Analyze protocol traces, air-interface captures, and diagnostic logs (RRC, NAS, PDCP, RLC, MAC, PHY) to debug complex failure modes, throughput bottlenecks, and interoperability issues
  • Intelligent Test Automation: Build scalable test automation and leverage machine learning/data-driven methods to automate anomaly detection, KPI trend analysis, and failure triage across large test sets
  • Cross-Functional Collaboration: Partner with baseband firmware, protocol software, platform architecture, and RF hardware teams to reproduce issues, validate bug fixes, and ensure 3GPP conformance
  • Testbed & Tooling Development: Contribute to internal test infrastructure, test case development, and evaluation platforms spanning both commercial test equipment and software-defined radio (SDR) / open-source protocol testbeds

Qualifications

  • Master’s degree in Electrical Engineering, Computer Engineering, Telecommunications, Computer Science, or a related field
  • Deep understanding of 3GPP LTE and 5G NR specifications across the protocol stack (PHY, MAC, RLC, PDCP, SDAP, RRC, NAS) and end-to-end cellular architecture
  • Hands-on experience implementing, debugging, or validating cellular protocol stacks or physical-layer modules using commercial test equipment or open-source wireless testbeds
  • Strong proficiency in Python for test automation, data processing, and log parsing
  • Solid grasp of digital communication principles, modulation, OFDM, and channel coding schemes

Skills

Required:Test automationPythonProtocol knowledge (LTE/5G NR)

Benefits

  • Comprehensive medical and dental coverage
  • Retirement benefits
  • Discounted products and free services
  • Educational expense reimbursement for career advancement
  • Potential discretionary bonuses or commissions and relocation assistance
  • Apple shareholder opportunities via discretionary RSU awards and Employee Stock Purchase Plan
Last updated Sep 25, 2026. Interested? Apply on the company site.

About Apple

Discover the innovative world of Apple and shop everything iPhone, iPad, Apple Watch, Mac, and Apple TV, plus explore accessories, entertainment, and expert device support.

Discover the innovative world of Apple and shop everything iPhone, iPad, Apple Watch, Mac, and Apple TV, plus explore accessories, entertainment, and expert device support.

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