As long as the opportunity is still up on our site you can apply for it. We will remove opportunities when they are filled or are no longer interested. The reason opportunity deadlines are published is to help organizations communicate the immediacy of their projects. Sometimes projects are matched long before the deadline, and sometimes long after the deadline.
If you’re not sure, feel free to use the public “Ask a question” feature at the bottom of each opportunity, or simply request an introduction to see what happens.