Yup can confirm, after a decent contribution to a known apache project, had three well known companies reach out, two of which the engineering manager was the one reaching out.
Would love to know more. What project was it? Did you contribute wanting a job or was interested any way? Did you get a job through this strategy?
I contributed because the company I worked for needed new functionality, then I decided it was interesting to make it generic enough to release to everyone. I did it a little bit as something to throw on the resume, but no idea if it helped to get my current job.