I write about technology, life, and the things I learn along the way.
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How a single self-hosted CloudNativePG cluster hosts a separate PostgreSQL database per tenant instead of one shared schema: provisioning with plain SQL, routing each request to the right database, running migrations across every tenant, connection limits, and what still doesn't scale.
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A practical look at running self-hosted PostgreSQL on Kubernetes with CloudNativePG: how WAL archiving works, setting up continuous backups to object storage, point-in-time recovery, the GitOps trap that can quietly recreate an empty database, and a cron-based alert system that doesn't need Prometheus.
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A hands-on introduction to load testing APIs with Grafana k6: installing it, writing your first script, reading the summary output, ramping virtual users with stages, failing builds with thresholds, and watching results live with the built-in dashboard or a real Grafana instance.
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A practical walkthrough of hardening a new Linux VPS before shipping an app to it: SSH key-only auth and the cloud-init gotcha that undoes it, a low-privilege deploy user instead of root, UFW firewall rules, fail2ban, and the smaller stuff people skip.
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What Clean Architecture, Hexagonal Architecture, and Ports & Adapters actually are, why two of those names are literally the same pattern, and how the dependency rule plays out in a real example written twice, once in Go and once in Spring Boot.
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How Dependabot actually works, how to enable it, tune it with dependabot.yml, and wire it into GitHub Actions so dependency PRs merge themselves when tests pass. Covers version updates, security updates, grouping, and auto-merge.
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What a database index really is under the hood, why queries crawl without one, and how to create, inspect, and reason about indexes in PostgreSQL and MySQL. Covers B-trees, composite indexes, EXPLAIN output, and when an index actually hurts.
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How database replication actually works under the hood, with real streaming replication, binlog/GTID, and replica set examples from PostgreSQL, MySQL, and MongoDB. Covers replication lag, sync vs async, and elections.
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What an in-memory database actually buys you over Postgres or MySQL, with real Redis examples for caching, leaderboards, and rate limiting. Also covers the 2024-2026 Redis license drama and where Valkey, Dragonfly, and Garnet fit in.
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What database transactions are, why they exist, and how to use them in plain PostgreSQL, MySQL, and Prisma. Covers ACID guarantees, isolation levels, rollbacks, and interactive transactions with real code.
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From manually tagging commits to a fully automated GitHub Actions pipeline with semantic-release. Everything you need to know about SemVer, conventional commits, and branch-based release channels.
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Why rate limiting matters for any production API, and how to add it to a real NestJS application. Covers the built-in throttler, a custom Redis-backed guard for AI endpoints, and a Python script to actually verify it works.
