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These Are the 20 Fastest-Growing Skills in the Online Job Market

The kind of engineers behind virtual assistants like Siri are suddenly in high demand, new data show.
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Photographer: Ian Waldie/Bloomberg

Next time you’re searching for a new job, look to Siri for inspiration.

Coders who can help machines communicate with people are in high demand. Software engineers who program computers to understand human speech saw U.S. demand for their labor grow faster than workers with any other skill, according to data from last quarter compiled by Upwork, a website that matches freelancers with employers. The skillset, called natural language processing, is what powers voice-activated virtual assistants like Apple's Siri and Amazon's Echo devices.