As we’ve said before, HR may not be super sexy, but it sure is catching investors’ eyes.

Today, payroll and benefits software company Zenefits announced that it has raised $66.5 million as a second round of institutional funding. This round is coming in only a few months after its first round in January and less than a year and a half after its launch.

Zenefits makes cloud-based software that takes care of companies’ payroll and other HR administrative tasks. Cofounder Parker Conrad started Zenefits after realizing how much of a hassle the old way of managing these things was while at his previous startup SigFig.

“We had no HR person, and so all the admin crap floated to the top,” Conrad said to Venturebeat. “I ended up having to deal with it, which I deeply resented. I would much rather do something else. I went through a list of things I hated dealing with at that last job, and Zenefits is now building features one by one so other people won’t have to.”

While there are certainly other companies out there that are also working to make annoying HR paperwork a thing of the past, Zenefits quick growth is notable. The company raised $15 million only a few months ago, and has since grown its team from 15 to 120 employees, and tech companies now represent only half of its 2,000 customers, in contrast to comprising 96 percent three months ago.

“Zenefits is well on its way to 1,300 percent growth for the year, which is some of the fastest growth we’ve ever seen. With Zenefits, no startup entrepreneur or human resources head and their team should ever have to spend mind-numbing hours on tedious administrative HR paperwork again, allowing them all more time to lead” said Andreessen Horowitz general partner Lars Dalgaard, who led this round.

“This was the hottest deal in Silicon Valley five months ago, and it still is today.”

Moreover, it’s attracted the attention of Institutional Venture Partners (IVP) among others, a venture capital firm traditionally focused on later stage investments.

“Zenefits is scaling faster than any software company that we’ve ever seen,” said IVP general partner Jules Maltz.

“As a later-stage investor, it’s rare for us to participate in large Series B rounds. We’ve only done this a few times for exceptional companies including Dropbox and Snapchat.Zenefits is on a similar trajectory, and we’re thrilled to help them disrupt the HR software market,” added Maltz.

The company said it will use the new funds to continue building out its technology, as well as to expand its team as it continues to grow.

Andreessen Horowitz led this round, with additional participation from IVP, SV Angel, former Twitter and Google executive Elad Gil, and actor Jared Leto.

Zenefits was founded in January 2013 by Conrad and Laks Srini, and is located in San Francisco. This new round of funding is bringing the company’s total funding to date to $83.6 million.

More information:

With $3 billion of committed capital, Institutional Venture Partners (IVP) is one of the premier later-stage venture capital and growth equity firms in the United States. The partnership is currently investing IVP XIII, a $750 million ... read more »

Andreessen Horowitz is a $950 million venture capital firm that was launched on July 6, 2009. Marc Andreessen and Ben Horowitz are the general partners of the firm.... read more »

SV Angel is the micro VC firm located in Silicon Valley and founded by angel investors, Ron Conway and David Lee. SV Angel provides capital investments to early stage companies focused on the Internet, e-commerce, and information techn... read more »

Zenefits runs your benefits, so you can run your business. First, Zenefits helps you get affordable benefits for your company—from healthcare to 401k—in minutes. Then Zenefits manages all your ongoing, time-consuming HR work for yo... read more »

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