Plessey has a long history of innovation. Founded in 1956, we have evolved from one of Europe’s earliest semiconductor pioneers into the world’s most advanced microLED specialist. Over the decades, Plessey has built a first class, fully integrated platform designing, manufacturing, and engineering next-generation display technologies entirely in-house. This end-to-end capability, combined with our strong IP portfolio, uniquely positions us to lead the scaling of MicroLED’s from lab innovation to high-volume production.
Our future is even brighter. We believe MicroLED’s will define the next era of technology—powering ultra-efficient AR/VR displays, driving optical processors that make AI faster and more sustainable, and enabling devices yet to be imagined. With our unique expertise and talented team, we are positioned to lead this transformation.
It’s an exciting time to join us: Plessey has recently been acquired by Haylo Labs, accelerating our growth and opening new opportunities.
Our Values
* Lead
* Grow
* Trust
Location
Located at our head office and state-of-the-art fabrication facility in Plymouth.
About the Role
We are seeking a senior Embedded Software Engineer to join the Product Development team and contribute to embedded firmware development and hardware–software integration.
This is a hands-on role, working closely with the Principal Engineer and Senior Hardware Engineer to translate system architecture into reliable embedded implementations across prototypes, demos, and product platforms.
Key Responsibilities
* Design, implement, and maintain embedded firmware in C/C++.
* Develop and maintain low-level drivers and application firmware.
* Support bootloader development and firmware update functionality.
* Implement firmware robustness, error handling, and recovery paths.
* Support firmware bring-up on new hardware.
* Debug hardware/firmware issues involving power, clocks, interfaces, and timing.
* Work with schematics, PCBs, and lab equipment during development and debugging.
* Support validation and test readiness of embedded systems.
* Translate architectural intent into working embedded implementations.
* Take ownership of defined subsystems with appropriate guidance.
* Contribute to technical documentation and knowledge transfer.
* Support integration with test environments and higher-level software systems.
Skills, Knowledge and Expertise
* Background in Electronic Engineering or similar discipline.
* Experience in embedded software development (C/C++).
* Experience with microcontrollers (e.g. STM32 or similar).
* Experience with bare-metal and/or RTOS-based systems.
* Comfortable reading schematics and understanding hardware design.
* Experience with board bring-up and low-level debugging.
* Experience using SWD/JTAG, logic analysers, and oscilloscopes.
* Understanding of common interfaces (USB, SPI, I²C/I3C, UART).
Advantage
* USB device development experience.
* Familiarity with embedded Linux or Zephyr.
* Experience supporting prototype, demo, or pre-production systems.