Do you have a passion for invention and self-challenge? Do you thrive on pushing the limits of what's considered feasible? As part of an extraordinary modem team, you'll craft sophisticated leading-edge embedded firmware that delivers more performance in our products than ever before. You'll work across subject areas to transform improved hardware elements into a single, integrated design. Join us, and you'll help innovate new wireless systems technologies that continually outperform the previous iterations! By collaborating with other product development groups across Apple, you'll push the industry boundaries of what wireless systems can do and improve the product experience for customers across the world.

As a Cellular 5G/4G Firmware Verification Engineer, you will be at the center of the embedded 5G/4G multimode cellular firmware effort within a silicon design group responsible for crafting and productizing state-of-the-art cellular SoCs. This position requires someone comfortable with all aspects of embedded firmware verification, who thrives in a dynamic multi-functional organization, is not afraid to debate ideas openly, and is flexible enough to pivot on constantly evolving requirements. Increasingly, this work intersects with AI/ML-driven optimisations - from intelligent test generation to on-device machine learning for signal processing - and we're looking for engineers excited to operate at that frontier.

Description

• Design and develop validation frameworks and test cases for 4G/5G firmware, execute and debug test scenarios, identify issues, and gate correct firmware functionality prior to release
• Collaborate with cross-functional teams, i.e. component validation, integration, protocol test, firmware, and systems engineering teams, to design firmware verification test cases, drive end-to-end physical layer performance evaluations, and validate new and existing feature functionalities
• Verify concurrency and cross-feature interactions, ensuring correct and overall firmware behavior as new features are integrated
• Leverage large language models (LLMs) and AI/ML models to accelerate test coverage analysis, root cause analysis, and documentation workflows
• Develop and maintain test automation pipelines for 4G/5G UEs, test simulators, and test gNodeBs, encompassing API and interface development to integrate with both internal and external verification solutions
• Assist in the development of pre-silicon emulation systems and virtual platforms for firmware design and hardware verification

Preferred Qualifications
A bachelor's, master’s or PhD degree with a focus on Wireless Technology, signal processing, communications systems, or machine learning is a plus. We encourage candidates at all experience levels - from recent graduates to seasoned professionals - to apply.
Hands-on experience with firmware test case planning, design, and development for 4G/5G functional and performance scenarios
Experience with network emulators, silicon prototyping, emulation systems, and virtual platforms is a plus
Experience with automation tools and C/C++ is a plus
Familiarity with build and source code control tools
Some knowledge of software engineering principles is a plus
Good understanding of core computer science fundamentals such as data structures, algorithms, and operating systems, etc.

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. At Apple, we’re not all the same. And that’s our greatest strength. We draw on the differences in who we are, what we’ve experienced, and how we think. Because to create products that serve everyone, we believe in including everyone. Therefore, we are committed to treating all applicants fairly and equally. We will work with applicants to make any reasonable accommodations.

Minimum Qualifications
In-depth understanding of 5G and 4G 3GPP physical layer and protocol stack procedures and configurations
Strong grasp of programming and scripting languages, including Python and Java
Familiarity with physical layer test equipment and network simulators (Keysight, Anritsu, R&S), along with their APIs and automation interfaces
Familiarity with AI/ML concepts, large language models (LLMs), and machine learning tools that can be applied in verification workflows