Thrive Capital led a $6.4m round for the employee performance management platform that follows a Slack-backed seed round last year.

Lattice, a US-based employee assessment software startup backed by communication technology platform Slack, received $6.4m on Wednesday in a series A round led by venture capital firm Thrive Capital.

The round also featured VC firms Khosla Ventures and SV Angel according to Fortune, and follows a $2.8m seed round in May 2016 backed by Slack’s Slack Fund as well as Thrive Capital, Khosla Ventures, SV Angel, Fuel Capital and assorted angel investors.

Lattice has built a software platform that combines…