How can I create a site like Stack Overflow?

Stack Overflow (website) itself is not open source. But you can find tons of open source alternatives.

  1. Stack Exchange clones
  2. Is there an open-source alternative to Stack Overflow I can use for internal Q&A?
  3. What are the best alternatives to Stack Overflow?
  4. Is there an open source alternative to the Stack Overflow model?
  5. Ask HN: Open Source Alternative to Stack Overflow?

If you really wanna build a site like Stack Overflow, you can hire a lot developers to build one.