DevOps

How I set up professional email on my custom domain using Zoho Mail and Cloudflare DNS — complete with SPF, DKIM, DMARC authentication, alias routing, and folder-based filtering.

Block outbound internet for specific Linux apps using UFW while keeping LAN access. Five approaches from quick wrapper scripts to production-hardened setups — plus the security flaw nobody talks about.

I built a lightweight library that opens static SVG and Mermaid diagrams in a fullscreen viewer. It has zoom, pan, search, a minimap, rotation, readable labels, watermarks and export to SVG, PNG and PDF. A CI/CD pipeline lints, tests and builds every change and publishes releases to npm.