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      <title>Case Studies | Ambuj Raj</title>
      <link>https://ambujraj.com</link>
      <description>Designing &amp; building scalable products.</description>
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          <title>Architecting Enterprise Authentication: A Production-Grade OAuth2 &amp; RBAC System</title>
          <link>https://ambujraj.com/case-studies/enterprise-auth-rbac</link>
          <description>A deep dive into designing a secure, scalable authentication infrastructure using OAuth2, JWTs, and Spring Security for high-compliance enterprise environments.</description>
          <pubDate>2026-01-01T00:00:00.000Z</pubDate>
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          <title>Re-architecting a Backend to Serverless (200% Performance Improvement)</title>
          <link>https://ambujraj.com/case-studies/serverless-backend-optimization</link>
          <description>Transformed a traditional server-based Python backend into a serverless architecture using AWS SAM and FastAPI, achieving 200% performance improvement while reducing costs by 60%.</description>
          <pubDate>2025-12-28T00:00:00.000Z</pubDate>
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