Dear friend
I am Web Developer and had much experience in converting HTML to PDF by using DOMPDF or TCPDF. Please check my review about this skill if you want to ensure
About your project, I have some questions
+ Can you send me your sample design about PDF layout you want? that is invoice or quote or statement ?
+ if many data, i will tell you what is fast way because DOMPDF is good but if too many html code, speed to export is fair slow.
I am serious developer and did this before so happy if I can help you deliver good solution. I will support and maintain for you after project is live
I will update you daily about progressing of project
Best regards
Linh