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# Cellular 4G/5G System Performance Engineer

- **Company:** Apple Inc.
- **Location:** San Francisco, CA, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), 4G (Telecommunication), Systems Engineering, C++ (Programming Language), Protocol Stack, Software Debugging, Firmware, Python (Programming Language), Network Layer, Software Engineering, Scripting, Programming Languages
- **Published:** October 11, 2026
- **Apply:** https://www.juju.com/job/1_apple2-200666099

## About the Role

This position requires someone comfortable will all aspects of embedded system/firmware verification, that thrives in a dynamic cross-functional organization, is not afraid to debate ideas openly, and is flexible enough to pivot on constantly evolving requirements. **Minimum Qualifications** + BS and a minimum of 10 years relevant industry experience. + Advanced knowledge of 4G/5G physical layer, protocol stack and procedures. + 5+ years of experience in 4G/5G development / system engineering / device performance verification. + Experience in investigating and troubleshooting cellular device performance issues. + Strong analysis and debugging capabilities to be able to debug performance issues and work with firmware development and systems design teams to close these issues. + Understanding of software engineering principles, and core computer science fundamentals. + Proficient in scripting or programming languages such as Python, C/C++. + Experience and knowledge of multiple
4G/5G signaling and physical layer test equipment (Keysight/Anritsu/R&S) along with their automation interfaces. **Preferred Qualifications** + Ph.D degree in wireless communication or electrical engineering. + Advanced knowledge of 4G/5G physical layer, protocol stack, and procedures. + Over 10 years of experience in 4G/5G development / system engineering / device performance verification. + Experience in 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. + Proficient in scripting or programming languages such as Python, C/C++, and Java.
A solid grasp of automation tool chain. + Extensive experience and knowledge of various 4G/5G signaling and physical layer test equipment (including Keysight, Anritsu, and R&S) and their automation interfaces. + Solid knowledge in Layer 2/Layer 3/ NAS and network performance optimization (a plus). + Experience with network emulators, silicon prototyping, emulation systems, and virtual platforms a plus.

## Description

As a Cellular 4G/5G System Performance Engineer, you will be at the center of the embedded 5G/4G/multimode cellular system / firmware effort within a silicon design group responsible for designing and productizing state-of-the-art cellular SoCs.