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The average salary for a back-end developer is $123,689 per year in the United States as of 2019. Back-end development is everything that happens behind the scenes, including the databases, the business logic, the API layer and pretty much everything other than the user-interface. The top tech stacks to pick as a backend developer are: JavaScript, Python, Meteor, Postgres, Django and C#. Backend developers need to choose which programming language they plan to use for your application.