Serena Software, a San Mateo company that provides companies with software to manage changes in the lifecycle of complicated projects, has agreed to acquire Pacific Edge Software of Bellvue, Wash., a provider of project and portfolio management solutions.

No financial terms were disclosed for the deal. It is expected to close later this month.

Serena Software is backed by Menlo Park tech buyout firm Silver Lake Partners. Pacific Edge has raised about $44 million in backing from a number of backers, including Sequoia Capital, Stanford University and Foundation Capital.