In what’s being described as one of the largest venture capital rounds in a Portland startup, Janrain has reeled in $33 million in fresh financing from the likes of Millennium Technology Value Partners, Salesforce.com, Epic Ventures, DFJ Frontier and others. Total funding now stands at about $53 million.

The Oregonian’s Mike Rogoway notes that the $33 million round is more than double the size of any investment in a Portland startup last year.

Janrain says that more than 365,000 Web sites – including those for Dr. Pepper, Samsung, Fox Networks and Mattel — have used the technology to allow easier social sign-ins via Facebook, Twitter, LinkedIn and other services. The 8-year-old company, which now employs about 170 people, says that 77 percent of Internet users prefer social sign-ins, and those sign-ins actually help improve conversions by 50 percent.

Like what you're reading? Subscribe to GeekWire's free newsletters to catch every headline

Job Listings on GeekWork

Find more jobs on GeekWork. Employers, post a job here.