DH

Tutorials

Learn to build SaaS.

Practical tutorials on building modern web applications.

4 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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3 min read
Database Migrations in a Django + FastAPI Shared-Schema Setup Without Conflicts
Run Django and FastAPI against one PostgreSQL schema without conflicts. Clear ownership rules, conflict detection, and working code patterns for shared migrations.
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4 min read
Structured Logging and Observability for the Django + FastAPI + Next.js Stack
Production-ready observability pattern with JSON logging, request correlation IDs, and queryable logs across frontend and backend—turning 3-hour debugging sessions into 20-minute fixes.
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4 min read
CI/CD Pipeline for a Dockerized Full-Stack App: GitHub Actions to ECS
Production-ready GitHub Actions workflow that builds Docker images, pushes to ECR, and deploys to ECS Fargate—eliminating manual deploys and 11pm hotfixes.
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4 min read
Background Jobs and Task Queues: Celery vs. Arq vs. Postgres-Backed Queues
Compare production task queue options: Celery's battle-tested complexity, Arq's lightweight simplicity, and Postgres-backed alternatives. Choose the right fit for your scale.
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4 min read
Connection Pooling for PostgreSQL with PgBouncer in a Dockerized Stack
Deploy PgBouncer to eliminate connection exhaustion in PostgreSQL. Infrastructure-level pooling that survives application scaling without code changes.
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