Blue Box, a Seattle-based cloud hosting company which has bootstrapped its way to success over the past nine years, has raised $3.5 million in a round led by Voyager Capital.  It marks the first outside capital in the company, whose nearly 600 customers include MTV, CrowdStar and Bonanza.

“Building applications for the Web comes with its own set of unique challenges. How do you scale your apps economically? How do you ensure security without slowing down performance? How does the cloud play into all of this? Over the course of nine years, we’ve learned how to bring these efficiencies to customers so they can focus on what’s most important – their applications,” said CEO Jesse Proudman in a statement. “This investment represents a new chapter for Blue Box as we productize our service offering and build out our architecture to support our next stage of growth.”

Blue Box says it uses a mix of open source technologies, such as OpenStack and Opscode’s Chef, and its own proprietary technology to deliver a higher quality of service than other cloud hosting providers. As a result of the investment, Voyager’s Bill McAleer has joined the board of Blue Box.

Blue Box employs 56 people, and plans to bolster its engineering and marketing efforts as a result of the funding.

[Editor’s Note: GeekWire is a Blue Box customer]

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