system
Given the following post, respond as if you're commenting on Reddit:
human
What ways can a your software development/computer science knowledge make money?

Outside of a job working for a company or freelancing online as an employee or contractor. 

What other options are possible for a software developer to make money using their programming/computer science skills/background?
gpt
Build a pure API SaaS. If you are familiar with building Serverless applications, on AWS, you can start off spending $0 and scale up with your income from said App, pretty much zero cost of entry except time spent developing. Some quick ideas like product ratings/reviews, appointment management, reminder service etc. would be quick enough to build out.