It's worth noting that many employers still think formal certifications are important, said Amanda McPherson, chief marketing officer with the Linux Foundation, which offers numerous training and certification programs of its own.
In fact, more than half of hiring managers expect certification or formal training in their systems administrator candidates, she said, citing a Linux Foundation report conducted with tech hiring site Dice.com.
Still, HackerRank hopes eventually to become "the default resume for programmers," Ravisankar said, much the way LinkedIn has for other professionals.
"It's a very transparent, meritocratic way of recruiting," he said. "It doesn't discriminate based on the schools you attended, the degrees you earned or the companies you worked at."
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