PDF File Merging and Optimization

I have a very large file, over 100 MB, that I need to combine into a single PDF document. The final document should be optimized specifically for printing, so the final output should be a high resolution document.

Key tasks for this project include:
- Merging multiple PDF files into one cohesive document
- Optimizing the document for high resolution, quality printing

The ideal candidate should have experience and skills in:
- PDF manipulation and optimization
- Merging large PDF files
- Understanding the necessary image resolution quality for print

I need this project completed as soon as possible.