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System Design for Python Juniors
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Module 6 · Real-World System Design Cases
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Design 2FA flow
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📝 **Question:** Best 2FA option to recommend in 2026? 📋 Pick the right answer. 💡 **Hint:** Re-read the theory above if unsure.
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📝 **Question:** Best 2FA option to recommend in 2026? 📋 Pick the right answer. 💡 **Hint:** Re-read the theory above if unsure.
A
SMS one-time codes — universally supported on every phone since 1999, no app install, lowest friction for non-technical users.
B
WebAuthn / passkeys — phishing-resistant, no shared secret, hardware-backed on most devices. TOTP is acceptable; SMS is dangerous.
C
Email magic links — convenient, no separate device required, and the user already trusts the email account they signed up with.
D
Push notification to the mobile app — quick tap-to-approve UX that works even when the user is mid-flow inside the same browser tab.
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