Extensive hands-on experience of C programming in an embedded environment
Proven track record using microcontrollers in domestic or industrial products
Use of peripheral chips (eg SPI, serial bus interfaces)
Good understanding of Real-time programming techniques
Optimisation techniques for minimum code footprint
Good communication skills

Previous technical customer-facing role
GNU tools (make, gcc, cygwin etc) on Windows or Linux platforms
Experience of long-life, low-power systems
Experience of wireless systems, particularly 802.15.4 or Zigbee
Hardware design and interfacing