The top paying technologies in 2016 according to StackOverflow were F#, Dart, Cassandra, Spark, Hadoop, Clojure, Scala, Salesforce, Redis, Go, Cloud (AWS, Azure, GAE, etc). The most trending technologies were React, Spark, Swift, Cassandra, Raspberry Pi, Node.js, Cloud and Python.
The highest salaries software engineers received in the US, Switzerland and Japan. Also developers in Northern and Western Europe tend to have higher salaries than their colleagues in Eastern European countries.
Finally, programmers got higher salaries with cloud-related technologies and such languages as Swift, Go, Scala and Python, which the majority of software development community is eager to learn within 1-2 years.