We are in contact with two of the leading (micro)electronics producers in Bulgaria. I spoke to them about DIY ventilators and they said they are ready to help.
1. ATM electronics
They produce high-end unique electronics for companies like ABB and have provided products to medical device manufacturers. They can help with both design and production. You can directly get in touch with the managing director ng. Sergej Shardin (http://atm-el.com/contacts.html)
2.) Next lab
Next Lab is more R&D oriented. Its manager Nikolay Iliev (one of the founders of Datecs) said they could also help. You can e-mail him (firstname.lastname@example.org) or send Viber messages (+359 888-217-272)