A year and a half after securing its last funding round, Sauce Labs Inc. has raised a mammoth $70 million investment from a trio of private equity firms.

The biggest name on the list is Institutional Venture Partners, one of the oldest funds on Silicon Valley’s famed Sand Hill Road and an early backer of major tech firms such as Twitter. It was joined by the startup investment arm of Wall Street heavyweight Centerview Partners and London’s Adams Street Partners. The cash infusion will enable Sauce Labs to seize upon the growing demand for its cloud-based testing platform, which helps companies find problems in their software projects before launch.

The service provides a secure environment for examining the usability of web and mobile services that includes a variety of automation features designed to streamline the process. Morever, it works with practically every popular development tool from frameworks such as Node.js to leading continuous integration systems. After setting up a project in the platform, developers can carry out pre-configured tests using Selenium, Appium or one of the other open-source automation tools that Sauce Labs supports.

One of the main selling points of the service is that it provides the ability to carry out a large number of tests simultaneously. As a result, a developer who, say, wants to see how his or her web app performs in different versions of Chrome only has to wait as long as it takes to complete one trial run instead of performing the tests sequentially. The subsequent time savings can add up quickly in a large organization with upwards of dozens of different software projects.

Today’s funding will finance the development of new features. In addition, the startup will use the new capital to expand its sales, marketing and customer support teams. The round brings its total raised to $101 million.

Image via Sauce Labs