Systematic Service Hardening: Security, Performance, and Reliability
How I hardened three production services in one week: N+1 queries, race conditions, SSRF protection, atomic counters, and 124 new tests.
🎯 Vulnerability: Server-Side Request Forgery (SSRF)
💡 Defense Fix: Enforce URL whitelisting, block private IP ranges (10.0.0.0/8, 169.254.169.254), and mandate AWS IMDSv2 headers.