Gaining participation in an open sourcing project is an art. @AngelList suggests three behaviours that will attract developers.
1. Write Code Any Engineer Can Read
[In] … a good example of clearly written open-source software … [the] project’s structure is modular, and the code is thoroughly commented and simple to read …
2. Write Documentation That Sells
… convince engineers, at first glance, that your project is worth contributing to. [….]
3. Promote Your Repo Like A Product Launch
In 2018, more than 82,000 repositories are published to GitHub every day. Getting your repo to stand out among the millions of others will require effort and strategy, but it’s not altogether different than launching a product. [….]
Source: “Want To Recruit Better Engineers? Open Source Your Code” | Nov. 19, 2018 | AngelList at https://angel.co/blog/want-to-recruit-better-engineers-open-source-your-code