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  1. express

    Replacing a Wildcard CORS Policy: An Express Allowlist Case Study

    How we replaced a permissive Express `cors` regex with a strict allowlist — escaped-dot origin matching, `Vary: Origin` on every response, and no more CWE-942 finding on the pen-test report.

    Nedim Hadzimahmutovic 8 min
  2. aws

    Cutting the File-Upload Bill: A Cognito + S3 Case Study

    How we swapped a managed file-upload SaaS for a native Cognito Identity Pool + S3 direct-upload pipeline — `${cognito-identity.amazonaws.com:sub}` folder scoping, first-100-GB-free egress, monthly bill down.

    Nedim Hadzimahmutovic 10 min
  3. backend

    Upgrading TypeORM 0.3 to 1.0 in Production: A NestJS Case Study

    How we took TypeORM 0.3 → 1.0 to a live NestJS API without a headache.

    Taufan Fadhilah 8 min
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