Welcome,
Project with title Need design converted to Tajima DST file for embroidery just appeared on my screen and i red your description "I have a design in jpg, pdf, ai that needs to be converted into a Tajima DST file......"
I am shrewd illustrator with skills including Embroidery, Photoshop, Computerized Embroidery, Illustrator and Graphic Design.
Seems like your are on the right place and i am the right person offering services for this, i have recently done similar project which you can check on this link:
https://www.freelancer.com/u/LetsDezign.html
Do you have any specific required dimensions ?