A Principal Engineer must master both the art and science of low-level software engineering, combining a deep technical understanding of hardware and kernel architectures with the discipline to write maintainable, robust, and secure code.

Design, implement, and maintain PCIe device drivers for the Linux kernel
Collaborate with hardware engineers to define device requirements and troubleshoot issues
Optimize driver performance for reliability, low latency, and high throughput
Write and maintain technical documentation for driver software and APIs
Participate in code reviews, testing, and release processes
Contribute to upstream Linux kernel or open-source projects as needed

Technical Skills:

Linux Kernel Programming

Deep Understanding of Linux Kernel Architecture: Familiarity with kernel space versus user space, kernel modules, device driver concepts, and memory management
Kernel Module Development: Experience writing loadable kernel modules (LKMs) and integrating them with the Linux build system.
Debugging and Profiling: Proficiency with debugging tools such as kgdb, ftrace, perf, dmesg, and sysfs interfaces to troubleshoot and optimize drivers.

C/C++ Programming

Expertise in C Language: Mastery of C for low-level, performance-sensitive code, including bitwise operations, memory management, pointer arithmetic, and data structure optimization.
Familiarity with C++: Advantageous for certain projects, though most Linux kernel drivers are written in C. Understanding object-oriented concepts in a C context is also helpful.

PCIe Protocol and Hardware Knowledge

Comprehensive Understanding of PCIe Specification: Knowledge of the PCIe standard, including enumeration, configuration space, BARs (Base Address Registers), MSI/MSI-X interrupts, and bus mastering
Device Datasheet Interpretation: Ability to read and interpret PCIe device hardware documentation, including register maps, timing requirements, and signaling protocols
Interfacing with Firmware/BIOS: Understanding how PCIe devices are initialized during system boot, and the mechanisms by which firmware and BIOS communicate with hardware

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