CSV to PDF: PDF Generation, Fill out PDF template

I'm trying to make a website that will generate PDFs.

It needs to:

1. Upload a CSV file
2. Fill a PDF fixed template with the data from the CSV file.
3. Produce the PDF
4. Download the PDF

E.g. PDF generation for a student's feedback.

1. Upload CSV - student data (student number, name, grades, feedback)
2. Fill the fixed PDF template with this data, e.g.:

   Feedback

   Name | Mike

   Grade | A

   Advice | Work on ...

3. Generate PDF, MikeFeedback.PDF
4. Allow download of PDF

Any help would be appreciated (links, snippets of code, libraries to use etc...) Languages I'm familiar with: Java, JavaScript, HTML, C#.