A Firmware Engineer cover letter that gets read.

Dear Hiring Manager, When I debugged a critical memory leak in our embedded bootloader that was causing intermittent device failures in [specific achievement], I realized I thrive at the intersection of hardware constraints and software elegance. As a Firmware Engineer with [X years] of experience in real-time systems, I'm drawn to [Company] because of your work in [specific product/technology], and I'm confident my background in low-level driver development and bare-metal optimization directly addresses your team's needs. At [Previous Company], I owned the firmware stack for [specific hardware platform], writing efficient C and assembly code that reduced memory footprint by 40% while maintaining deterministic interrupt handling. I've debugged hardware-firmware interactions using oscilloscopes and JTAG debuggers, implemented bootloader updates over-the-air, and collaborated closely with hardware teams to resolve timing-critical issues. My experience spans [relevant microcontroller families/RTOSs], and I'm comfortable reading datasheets, optimizing for power consumption, and writing testable code despite the constraints of embedded systems. I'm particularly excited about [Company]'s approach to [specific technical detail from job description], as it aligns with my belief that firmware engineering requires both deep technical rigor and practical problem-solving. I'd welcome the chance to discuss how my experience scaling firmware across multiple hardware revisions and my obsession with understanding what the CPU is actually doing can contribute to your team. Best regards, [Your Name]