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Obviously I have a strong bias for the languages that I already know, but my list of top languages to learn in 2017 is this:
SQL (A database query language)
Swift (iOS) and Java/Kotlin (Android)
PHP and Rails
To be a well rounded software developer, you should probably understand how web frontend, mobile apps, and backends work to create a great user experience.
Knowing the above languages will cover most of what is important in the world today.
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