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Auditor
Hardware-based attestation / intrusion detection app for Android devices. It provides both local verification with another Android device via QR codes and optional scheduled server-based verification with support for alert emails. It uses hardware-backed keys and attestation support as the foundation and chains trust to the app for software checks.
Install GrapheneOS and run Auditor after the installation for hardware-based attestation. This way it's as safe as it gets. I would be more worried about the refurbished device having an unlockable bootloader, than about malware.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.