The challenge is the Azure Sphere OS itself and not the cloud component underlying it. Microsoft is looking for a group of security researchers, who are able to breach the Linux OS security system. You can apply here.
At the Build Developer Conference last year, Azure Sphere was revealed and is still very recent. Corporations like Starbucks are using Azure Sphere to protect their store equipment, which stores data for bean size, coffee temperature and water quality for every shot of espresso.
Microsoft CEO Satya Nadella, sees IoT devices as a key component of the company. Nadella traces billions IoT systems which will be used in the next decade, according to experts. Azure Sphere is a vital part of the challenge to help secure and manage these devices and part of Microsoft’s enhanced strategy to conquer an ever growing cloud-based future.