Current sub-processors
- MongoDB, Inc. (Atlas) — United States (EU region available) — Database hosting (encrypted at rest)
- Redis Ltd. — United States / EU — Rate limiting, caching, queues (no persistent PII)
- Mailjet SAS (Sinch) — France (EU) — Transactional email (staff email + names)
- PayPal (Europe) S.à r.l. — Luxembourg (EU) — Payment processing (school billing data, not student data)
- Backblaze, Inc. (B2) — United States — Audio-file storage (no personal data)
- DeepSeek — AI content generation (exercise prompts; no student PII)
- Google LLC (reCAPTCHA / OAuth) — United States — Bot protection / optional SSO
- Microsoft Corp. (Azure AD) — United States / EU — Optional SSO
- Kennisnet (Entree Federatie) — Netherlands — Optional Dutch-education SSO
