Ask HN: Filing GC application. Need to answer these questions

1.Please elaborate on the meanings of software development and software engineering. Since both are required to perform the job, please be sure to make clear how they are different.

2.Please elaborate on why experience is needed in software development and software engineering to perform the duties of the job. Explain specifically how this type experience enables the person to perform the duties of his job.

3. Please elaborate on why 4 years experience is needed in software development and software engineering to perform the duties of the job.

Any help answering these questions is appreciated.