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The $500k enterprise deal requires a SOC 2 audit. Your app has hardcoded secrets, no MFA, plain-text passwords in logs, and no audit trail. You have six weeks. This is what a security sprint actually looks like.
Deploy Content-Security-Policy with nonces, HSTS with preload, X-Frame-Options, and other headers that block real attacks. Using helmet.js for easy configuration.
Implement semantic caching to reduce LLM API costs by 40-60%, handle similarity thresholds, TTLs, and cache invalidation in production.
SSE is simpler than WebSockets: HTTP, auto-reconnect, one-way streaming. Perfect for dashboards, AI responses, and server→client updates. Learn when to use it.
Optimize Lambda cold starts, implement idempotent handlers, integrate with SQS, and understand when serverless costs more than traditional compute.