I wouldn't worry too much about not being taken seriously in a hoodie and jeans as a software developer unless you're working at an extremely traditional company that doesn't have much of a focus on the dev org. Hoodie and jeans is pretty much standard.
If you'd still like to dress "better" in general, the /r/malefashionadvice subreddit has some solid resources on the sidebar that you should check out.
If you'd still like to dress "better" in general, the /r/malefashionadvice subreddit has some solid resources on the sidebar that you should check out.