Human resources (HR) technology platform Justworks has raised $40 million in a series D round of funding led by FirstMark Capital, with participation from Index Ventures, Thrive Capital, Bain Capital, and Redpoint Ventures. Founded out of New York in 2012, Justworks serves as an online platform for businesses to manage their HR, payroll, benefits, and compliance procedures. Prior to now, Justworks had raised $53 million, and with another $40 million in the bank it said that it plans to invest in its “ongoing market expansion and product innovation,” according to a statement issued by the company.