Senior Firmware Engineer

2 weeks ago

London, Greater London, United Kingdom Reelables Full time £60,000 - £80,000 per year

This role is on-site in London, sponsorship is available

Reelables is a leader in IoT innovation, delivering cutting-edge connectivity solutions for global markets. We design and build products that combine hardware, software, and cloud technologies to enable smarter, more connected experiences.

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We are seeking a highly skilled Firmware Engineer to join our team and drive the development of embedded software for next-generation IoT devices. This role is ideal for someone passionate about low-level programming, wireless communication, and building robust systems for large-scale deployment.


Key Responsibilities
  • Develop and maintain embedded firmware in C/C++ for microcontrollers and IoT platforms.
  • Integrate and optimize Bluetooth LE (BT 5.x) stacks and related protocols.
  • Work with cellular modem firmware (LTE Cat-1, LTE-M, NB-IoT), including AT-command interfaces and API stack integration.
  • Implement and optimize firmware for RTOS environments (e.g., FreeRTOS).
  • Perform hardware bring-up and interface with peripherals (GPIO, I²C, SPI, UART, ADC/DAC).
  • Debug and validate firmware using JTAG/SWD, oscilloscopes, and logic analyzers.
  • Design for ultra-low-power operation, including sleep states and duty cycling.
  • Support OTA updates, bootloaders, secure boot, and provisioning.
  • Collaborate on hardware/software co-design during early development stages.
  • Ensure compliance with security standards (TLS, secure key storage, encryption).
  • Contribute to test automation using Python.

Requirements
  • Proven experience in embedded systems development using C/C++.
  • Strong knowledge of Bluetooth LE and cellular IoT technologies.
  • Familiarity with eSIM/eUICC, carrier certification (GCF, PTCRB), and regulatory compliance (FCC, CE, ETSI).
  • Experience with OTA firmware updates, secure provisioning, and mass production calibration.
  • Proficiency in Git for version control.
  • Understanding of IoT product lifecycle from prototype to production.
  • Bonus: Experience with Qualcomm or similar cellular SDKs.

Why Join Us?

  • Work on innovative IoT products impacting global connectivity.
  • Be part of a collaborative, fast-paced team driving technology forward.
  • Competitive salary, benefits, and opportunities for growth.

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