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Engity's answer:
We use Go for the backend and TypeScript with React for the frontend. We also rely on the OpenID Connect protocol and Security Assertion Markup Language (SAML). As algorithm for passwords we use Argon2, AES256 for data encryption and TLS 1.2+ for transport encryption. For signing JSON web tokens, we work with the Elliptic Curves Digital Signature.
Keycloak - Open Source Identity and Access Management for modern Applications and Services.
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
authentik - authentik is an open-source identity provider focused on flexibility and versatility.
Okta - Enterprise-grade identity management for all your apps, users & devices
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Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.