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Cellular 5G /4G Physical Layer Firmware Engineer

Apple· Hardware
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Bengalurufull-timePosted 4mo ago

About the role

Senior embedded firmware engineer focused on 5G/4G physical layer for state-of-the-art cellular SoCs. Responsibilities span implementing 3GPP protocols, DSP algorithms, HW/SW interface design, pre-silicon validation, and tooling. Based in Bengaluru, India, reporting to a silicon design group within Apple’s modem team.

Responsibilities

  • Implement key 3GPP protocols and control/data path processing algorithms with tight time, latency and energy budgets by interfacing to specialized cellular ASIC hardware.
  • Examples of processing include 3GPP channels and procedures such as PDCCH, PDSCH, PBCH, PUCCH, PUSCH, PRACH, UL/DL HARQ, Tracking loops.
  • Examples of 3GPP algorithmic areas include: Channel Estimation, Channel State Feedback, Interference Cancellation, Cell Search and Measurement, Beam Measurement.
  • Work with systems engineers to refine signal processing algorithms for efficient firmware/hardware execution
  • Work with silicon designers to define HW interfaces, processors, bus, DMA, accelerator, and memory subsystems.
  • Specify, design, and implement the firmware architecture of an innovative mobile wireless communications system.
  • Assist in the development of pre-silicon emulation systems/virtual platforms and use them for pre-silicon FW design and HW verification.
  • Evaluate and implement pioneering tools for build, formal verification and test.
  • Define methodologies and best practices.
  • As a Senior Cellular 5G/4G Physical Layer Firmware 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.
  • We are looking for someone with 10+ years experience across all aspects of embedded software development, who thrives in a dynamic multi-functional organisation, is not afraid to debate ideas openly, and is flexible enough to pivot on constantly evolving requirements.

Qualifications

  • Experience with hardware control for physical layer 4G/5G data path processing
  • Understanding of 5G and 4G 3GPP protocols
  • Experience implementing digital signal processing algorithms using special purpose digital signal processing HW
  • Strong understanding of linear algebra and digital signal processing principles
  • Deep understanding of software engineering principles, and core computer science fundamentals
  • Fundamental facility with C and C++, compilers, build and source code control tools
  • Significant experience with memory constrained Real Time Operating Systems (RTOS) and concurrent programming
  • Solid understanding of computer architecture with particular emphasis on the HW/SW interfaces of high speed communication subsystems
  • Experience with silicon prototyping, emulation systems, and virtual platforms
  • Proficiency debugging embedded software systems. Familiarity with UARTs, JTAG, and oscilloscopes
  • Some mainstream OS application level development and Python or Perl scripting experience
  • PhD/Master's/Bachelor’s degree in electrical engineering, electronics and telecommunications, computer engineering or computer science is required.

Skills

Required:3GPP protocol implementationDSP algorithm implementationC and C++RTOS experienceHW/SW interface designDebugging embedded systems
Last updated Jul 3, 2026. Interested? Apply on the company site.

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