The Renren-backed worker sourcing service has now raised $55m altogether and will spend its latest funding on product development, sales and marketing.

Shiftgig, a US-based employment platform for temporary workers that counts social media and online finance company Renren as an investor, closed a $20m series C round on Tuesday.

The new funding came from venture capital firms DRW Venture Capital, FJ Labs, GGV Capital and KDWC Ventures, and an affiliate of investment banking firm William Blair.

Founded in 2011, Shiftgig operates an online service that gives businesses on-demand access to hourly temp workers in industries such as retail, food service and…