Your working relationships are valuable. Give and get endorsements from your colleagues.
No resume is complete without a list of endorsements. Start building yours by sending out endorsement requests for projects you've worked on.
Endorsements work both ways... Don't just send out requests without helping your friends and colleagues!
A little bit of effort can go a long way. Give out endorsements for your friends and they may be able to help you out when it comes time to pull some strings.