Unified communications API company Nylas has secured $16 million in Series B funding. The investment was led by Spark Capital with participation from Slack Ventures, Industry Ventures, and ScaleUp. Existing investors 8VC, Great Oaks Capital, Rubicon Venture Capital and John Chambers’ personal fund also participated in the investment.

Andrew Parker, general partner at Spark Capital will join Nylas’ board of directors.

Nylas powers the communication layer in software applications. The Nylas API handles more than 100 million API requests per day, and has seen over 22,000 new developers sign up to test the platform this year alone, said the company in a statement.

Nylas customers include Newscorp, Dialpad, Salesloft, Pipedrive, Hyundai, and Ellie Mae, says the company.

[Image courtesy: Nylas]