A survey by freelance hiring platform Upwork said freelance software developers who work with old, relatively unpopular coding languages command the highest salaries.
Those skilled in Objective-C, which Apple wants developers to replace with Swift, earn the highest rates, averaging $66 per hour.
Although hourly rates among the top 15 languages show little variance, three stand out for year-over-year growth in contract volume: SQL topped the list with 152% growth, while Ruby and Java each grew 127% over the same term.
Upwork's Mike Paylor said, "There is demand for a broad range of programming skills, including mobile experts using Objective-C or Kotlin, data analysts and engineers using SQL, and developers using Java and Go."
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