Actually, thinking about it some more, I'd argue they're not real MECHANICAL engineers. Soldering is a mechanical process that connects components together and stops them falling off the PCB. It doesn't have much to do with electrical or electronic engineering.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.