David has established and grown companies for Philips Electronics, Fosters International and Honeywell across Australia and Europe. He's been advising businesses on energy efficiency and building performance for over a decade. A self‑confessed sustainability geek, David is often seen turning off office lights on sunny days and riding mountain bikes around Sydney's hills on weekends.

Tell leads our product development team. With over 10 years experience and degrees in Computer Science and Data Science from leading universities in Germany and Spain, we put him in‑charge of creating incredibly complex systems that will make your life easier. As much as we like Tell his diverse cultural background still confuses us whenever he takes his surfboard snowboarding.

Demetri’s work in Silicon Valley has been rewarded with multiple patents including display technologies used by Amazon Kindle and other e‑readers. He's developed battery storage technologies and has a Masters of Science in Engineering. As Wattcost’s hardware and data algorithms evangelist, he still says nothing smells quite as sweet as fresh electronics and solder fumes in the morning.