1. Microsoft Azure, Microsoft Ireland Operations Limited
South County Business Park, One Microsoft Place
Carmanhall and Leopardstown
D18 P521 Dublin
Ireland
Contact person: Contact form available here.
Description of processing: Data hosting services. 
A list of sub-sub-processors is available via this link.

2. Twilio Ireland Limited
25-28 North Wall Quay
1 Dublin
Ireland
Contact person: Data Protection Officer, privacy@twilio.com
Description of processing: Twilio is used for the identity validation of users. 
A list of sub-sub-processors is available via this link.

3. Mailgun Technologies, Inc.
112E Pecan St. #1135
San Antonio
TX 78205
USA
Contact person: Data Protection Officer, privacy@mailgun.com
Description of processing: Used for delivery of emails to users.
A list of sub-sub-processors is available via this link.