Zigbee System Embedded Engineer in Windsor

The Role

• The Hub Lite project is exploring a lower-cost, more supply-resilient alternative to the existing Linux-based Hive Hub, using a more constrained MCU-based hardware architecture while preserving the core customer experience of controlling Hive heating and other connected Zigbee devices via Hive cloud services and the Hive app.

• The work will start with a technology demonstrator on off-the-shelf development boards, then progress towards production-quality embedded software, platform/app integration, internal trials, and eventual qualification.

• The project is time-sensitive due to supply and cost volatility affecting the current hub hardware, and aims to de-risk Hive’s ability to continue selling and supporting hub-based propositions beyond 2026.

Your responsibilities:

• Build Hub Lite PoC firmware on development boards.

• Integrate Zigbee radio / network coprocessor stack.

• Implement core hub functions: pairing, device communication, command/control, reporting.

• Optimise for constrained memory and flash.

• Support OTA, diagnostics and production-readiness.

• De-risk areas where the current hub implementation cannot be directly ported.

• Advise on MCU platform choices, SDK constraints, portability risks and long-term maintainability.

Essential skills/knowledge/experience:

8 years of relevant experience

• Strong embedded C/C++.

• RTOS / constrained embedded systems.

• Espressif SDK / ESP-IDF experience strongly preferred.

• Wi-Fi / BLE / Zigbee / 802.15.4 experience.

• Silicon Labs MG2x Zigbee development experience strongly preferred, ideally including Zigbee Application Framework.

• Secure boot, OTA, provisioning and certificate-based device identity.

• MQTT / cloud-connected IoT devices.

• Device-side AWS IoT Core integration experience desirable, for example MQTT over TLS, X.509 certificate authentication, AWS IoT Device SDK, IoT shadows.

• Memory and flash optimisation on constrained MCUs.

Desirable skills/knowledge/experience:

• Matter / Thread / CAD / smart meter network experience.