DH

Tutorials

Learn to build SaaS.

Practical tutorials on building modern web applications.

13 min read
Building MCP Servers for Claude Code: A Production Pattern for Custom Tooling
Deploy custom MCP servers that give Claude safe, structured access to your APIs and databases—a production-ready pattern from infrastructure first principles.
ainodejstypescript
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4 min read
Golang Compare: A Practical Guide to Equality, Ordering, and Deep Inspection
Master Go's comparison semantics: when == works, why slices and maps don't, and production-tested patterns for safe equality checks across types.
golangtesting
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4 min read
`strpos` in PHP: Stop Getting Bitten by the Zero-Position Bug
Why `strpos` returns false AND 0, and how to check correctly. A production-hardened guide to the classic PHP footgun.
phpsecurity
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4 min read
Secrets Management for a Dockerised Stack: AWS Secrets Manager, SSM, and Local .env Parity
Production-ready pattern: AWS Secrets Manager and SSM Parameter Store for deployed environments, with genuine local .env parity—not aspirational.
awsdocker
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5 min read
Cloudflare in Front of an ECS App: WAF, Cache Rules, and Tunnels for the Full-Stack Stack
Deploy Cloudflare's WAF, cache rules, and tunnels in front of ECS workloads. Production patterns for session handling, cache invalidation, and private routing—without the enterprise overhead.
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3 min read
Full-Text Search in PostgreSQL vs. Reaching for Elasticsearch: A Pragmatic Decision Guide
Learn when PostgreSQL's native full-text search suffices and when Elasticsearch becomes necessary. A senior engineer's pragmatic guide to avoiding premature infrastructure complexity.
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4 min read
Securing Server-to-Server Calls Between FastAPI and Django with JWTs and mTLS
Layer JWTs and mutual TLS for production-grade service-to-service authentication. Identity at the application layer, trust at transport—the infrastructure judgment senior engineers use.
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5 min read
Caching Strategies with Redis for Next.js and FastAPI: When and What to Cache
Decision framework and working patterns for when and what to cache in a Redis-backed stack. Avoid costly staleness bugs and database fires with principled caching.
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4 min read
Rate Limiting and Throttling Patterns for FastAPI APIs in Production
Practical rate limiting and throttling strategies for FastAPI—from in-process solutions to distributed Redis setups. Production-tested patterns with working code.
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