authentication

A grounded explainer for backend engineers: HMAC-SHA-256 for webhooks, signed URLs, and internal auth, with three-language code and the boundary where digital signatures take over.

A comprehensive technical guide to Amazon Cognito's advanced features including custom authentication flows, federation patterns, multi-tenancy architectures, migration strategies, and production-grade security implementation.

Learn how to build, secure, and deploy custom Model Context Protocol servers for your organization's internal systems with TypeScript, including authentication, monitoring, and Kubernetes deployment.

A comprehensive security reference with implementation context, lessons learned, and practical guidance from production systems.

Working with authentication systems across various industries has revealed that one-size-fits-all authentication is a myth. Each business domain has unique requirements that dramatically shape your auth architecture choices.

Implementing custom domains, bulk operations, URL expiration, and comprehensive security measures. Defense-in-depth protection strategies for production link shortener services.

Real-world comparison of Auth0, Firebase Auth, Supabase Auth, AWS Cognito, and custom solutions. When to use each, cost analysis, and the debugging nightmares that taught me everything.