- Work with system engineers and FW developers to understand the details of system design and FW implementation. - Work with system engineer, FW developer, integration, and test engineers to troubleshoot UE performance-related issues. - Design performance verification use cases & test cases to effectively identify potential UE performance issues and ensure overall UE performance. - Guide test script & automation engineer to implement defined performance test cases and make sure the developed test pipeline can meet expectations. - Guide test executors to perform validation of new and existing features. Advanced knowledge of 4G/5G physical layer, protocol stack, and procedures. Proven work experience in 4G/5G development/system engineering/device performance verification. Good understanding of automation tools and scripting languages is required (hands-on experience with Python). Experience in investigating and troubleshooting cellular device performance issues. Strong analysis and debugging capabilities to be able to define issues and work with firmware development and systems design teams to close these issues. Deep understanding of software engineering principles, and core computer science fundamentals. Strong working knowledge of multiple 4G/5G signaling and physical layer test equipment (Keysight/Anritsu/R&S) along with their automation interfaces. English language proficiency is a requirement for this position Bachelor or Master or higher degree in Communications Engineering, Computer/ Embedded System Engineering, or Electrical/Information Engineering with several years of working experience or PhD in a relevant field with some years of proven experience. Experience working with other scripting languages such as C/C++, Bash, or Java is a plus. A solid understanding of L2/L3/NAS and network performance optimization is a plus. Experience with network emulators, silicon prototyping, emulation systems, and virtual platforms is a plus. Apple is an Equal Opportunity Employer that is committed to inclusion and diversity. We also take affirmative action to offer employment and advancement opportunities to all applicants, including minorities, women, protected veterans, and individuals with disabilities. Apple will not discriminate or retaliate against applicants who inquire about, disclose, or discuss their compensation or that of other applicants.