How to accept data from the form without unnecessary hassle?

Question

Computer networks

The task is to make an application form with spreading fields and file uploads. The form with client validation is ready. We need a backend with the ability to store downloaded applications and email notifications about new ones.
Too lazy to write a whole backend for such a primitive task. Tried to use https://getsimpleform.com , but came across file upload size limits. Are there ready-made solutions for such tasks?