As the e-commerce industry continues to explode, one startup that’s benefitting is Boston-based 6 River Systems. The business, which builds robots that speed up production in warehouses, has raised $25 million Series B financing in a round led by Menlo Ventures, with participation from Norwest Venture Partners, Eclipse Ventures and iRobot. 6 River says it has gained early traction with its robot, “Chuck.” Jerome Dubois, founder and CEO said that he believes 6 River has built “the first and only collaborative robot with the associates in the aisles doing the work.” In other words, 6 River aims to help humans be more efficient. Chuck keeps warehouse employees on task by guiding them through the facility through each step of the packaging process.