Satyam Parmar’s Post

Most #backend systems don’t get hacked through brute force — they break because #auth was an afterthought. After interviewing 200+ backend developers, I’ve realized: Security isn’t about adding JWT and moving on — it’s about designing trust, managing identity, and preventing misuse at scale. --- ⚡ Real-World Authentication & Authorization Scenarios I Ask 1️⃣ “Your app uses JWT for authentication. What happens when a user logs out?” 🔎 Looking for: Token invalidation, refresh token handling, and short-lived access tokens. 2️⃣ “A user tries to access another user’s data via modified IDs. How do you prevent it?” 🔎 Looking for: Authorization checks at the service layer, resource-based permissions, and secure access control. 3️⃣ “You have multiple services each handling auth. How do you centralize it?” 🔎 Looking for: Single Sign-On (SSO), OAuth2/OpenID Connect, and centralized identity providers. 4️⃣ “Your system supports both web and mobile clients. How do you handle session management?” 🔎 Looking for: Token-based authentication, secure cookie usage, CSRF prevention, and refresh token rotation. 5️⃣ “A partner API integration needs limited access to certain data. How do you grant it?” 🔎 Looking for: Scoped tokens, API key management, and granular permissioning. 6️⃣ “An access token is leaked. How do you limit the damage?” 🔎 Looking for: Revocation lists, short expiry windows, rotating secrets, and audit logs. 7️⃣ “Your users report random ‘unauthorized’ errors after deployment. How do you debug it?” 🔎 Looking for: Clock drift issues, token validation mismatches, caching layer delays, and misconfigured claims. --- 💡 Authentication proves who you are. Authorization decides what you can do. Get either wrong — and your system becomes a liability, not an asset. ---- If you want to learn backend development through real-world project implementations, follow me or DM me — I’ll personally guide you. 🚀 ---- #BackendDevelopment #SystemDesign #LinkedIn #LinkedInLearning

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