Big Data and IoT are one of the most commented themes in current engineering. In fact, they are concepts attributed with the evolution of computing. But what part of these systems already existed and now it's really in right now.
Today, there are technologies in medicine, history, archeology, civil construction, industries (mainly with 4.0), among others.
I recommend reading these papers that address both:
See top related journals , relevant list is as follows:
http://www.guide2research.com/journals/
Search review or survey paper from these of from top Survey journals like ACM computing Surveys, these will share the top recent topics as well research issues for future research options.