Seemed deceptively simple and I almost undersold it.
Start by clarifying that the Signup endpoint is a critical API that handles new user registration, then walk through its core responsibilities: validating input, creating a user record, and returning authentication tokens. Emphasize how it fits into Facebook's broader ecosystem, including security, scalability, and integration with other services.
Pro tip: Highlight the trade-offs between security (e.g., rate limiting, CAPTCHA) and user experience (e.g., frictionless signup), and mention how the endpoint supports multiple signup methods (email, phone, OAuth) to demonstrate product thinking.
Explain that the Signup endpoint allows new users to create an account by submitting credentials, and it returns a session token or user ID for subsequent requests.
Describe typical inputs (name, email/phone, password, birthday, gender) and outputs (access token, user ID, error messages), and mention validation and error handling.
Cover steps like input validation, duplicate checking, password hashing, database insertion, and triggering welcome emails or verification SMS.
Mention rate limiting, CAPTCHA, encryption, and how the endpoint handles high traffic (e.g., load balancing, sharding).
Explain how signup integrates with other services (e.g., Graph API, OAuth for third-party apps) and supports growth metrics like conversion rates.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.