Cellular Performance Engineer

Apple•Sunnyvale, CA

About The Position

In Apple’s Wireless Technologies group, the Cellular Performance Engineer will help develop cellular and satellite connectivity and next-generation wireless technologies. The role focuses on characterizing cellular software performance in laboratory and real-world settings, benchmarking power and performance across Apple products, and helping maintain end-user-facing quality throughout product lifecycles. The engineer will contribute to the architecture, design, and enhancement of communication technologies and products, from prototyping through commercialization, and collaborate with engineering teams across the company.

Requirements

Experience in a laboratory environment testing and benchmarking data, voice, and application performance of cellular systems.
Deep understanding of 3GPP cellular standards relating to 5G NR and LTE.
Demonstrated experience with higher-layer protocols such as TCP/IP.
Ability to debug and analyze issues across L1, L2, L3, and application layers of the protocol stack, as well as RF frontends.
Experience working with cellular call boxes and channel emulators in a laboratory setting.
Strong knowledge of Python scripting to automate performance testing and develop benchmarking tools and scripts.
Strong collaboration and communication skills across multidisciplinary teams.
Excellent problem-solving skills and a track record of delivering results in fast-paced environments.
Ability to communicate clearly and drive multiple projects across teams.
Ability to adapt to new technologies and propose data-driven technology and product improvements.

Responsibilities

Build and work with cellular performance laboratories.
Characterize cellular system performance in laboratory and real-world settings.
Develop expertise in cellular systems, RF frontends, hardware, and software by benchmarking power and performance for Apple products.
Assess technical features and software designs, and develop performance-focused test plans for data, application, and voice performance across Apple products.
Debug, analyze, and troubleshoot logs across baseband protocol stack layers L1, L2, and L3 to identify issues affecting product performance.
Test and analyze TCP/IP and application layers to understand their impact on end-to-end performance and user experience.
Ensure systems and software performance and user experience remain strong beyond laboratory testing and throughout the product lifecycle.
Collaborate with engineering teams across Apple and serve as a liaison between technology and product engineering teams.
Drive open issues across sub-components to resolution and improve product quality.
Summarize and present performance, key findings, open issues, and next steps in cross-functional forums and executive reviews.
Propose software optimizations and improvements based on performance data.
Automate laboratory performance test suites and develop tools and scripts for designing key performance indicators used to benchmark products.