In Germany we don’t “need” to do taxes as an employee, but you won’t get anything back if you don’t do them. You can usually just do them in some app, send them to the tax office, get some money back and pay the app a tiny fee for the help.
Then again if you own a house or a company or have any income that isn’t taxed as receiving a salary, you better get a tax consultant and those can be pricey.