Software Developer, Cryptography & Full-Stack
Posted Updated 5
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Summary
Secure Source is hiring a London-based developer to build its authentication protocol and identity integrations (OIDC, WebAuthn/passkeys), including offline peer-to-peer authentication. The role blends applied cryptography, mobile/SDK development, and signal processing fundamentals, with security and scalability as core goals.
What you'll do
- Work on our authentication protocol, including replay/relay resistance and key handling
- Integrate with identity providers via OIDC and WebAuthn/passkeys. One Identity today, with Okta and Microsoft Entra on the roadmap
- Contribute to our offline peer-to-peer authentication and its cryptographic protocol
- Help keep everything secure and scalable as we grow
What we're looking for
- Applied cryptography: solid working knowledge of key handling, hashing, replay/relay and protocol basics; you use crypto libraries correctly and think about threat models.
- Mobile development: you've built and shipped mobile apps or SDKs (native or cross-platform); a lot of what we do lives on the device.
- Signal processing: comfortable with the fundamentals (familiar with how audio is sampled and framed).
- Comfortable with IdP/SSO integration (OIDC, WebAuthn/passkeys)
- An eye for scalability and secure-by-design
Nice to have
- Embedded or OT exposure
- A security background or relevant certifications