What are some extra income for an engineer?

Hey I'm a chemical engineer for a big chemical manufacturer and my job is pretty much implementing capital and expense project, my question is there any engineer here that use their skill to gain an extra income? If so how did you get started?

submitted by /u/Necessary_Coast4484
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source https://www.reddit.com/r/beermoney/comments/1hh5qz8/what_are_some_extra_income_for_an_engineer/