Ask HN: How can I offer progression without management positions?

Hello everyone,

I lead a small team of software engineers. I have trouble with keeping some of my employees since they see management as the only option to further their career path. Since the team is so small there isn't really a need for these positions. Speaking as a developer gone manager I can assure them that the grass isn't always greener on the other side.

What are some ways that you can motivate people to stay in a career as software engineer. Is there a way to offer meaningful progression?