Notes on engineering, AI-augmented workflows, and shipping product.https://selim.services/en-ushttps://selim.services/blog/pdf-tools-guide/https://selim.services/blog/pdf-tools-guide/An engineer's trade-off guide to PDF operations: lossless vs lossy compression, client-side vs server, and which library actually fits the job.Wed, 24 Jun 2026 21:49:41 GMTpdftoolshttps://selim.services/blog/qr-codes-101/https://selim.services/blog/qr-codes-101/A developer's breakdown of how QR codes encode data, plus the error-correction, version, and static-vs-dynamic trade-offs that decide reliability.Wed, 24 Jun 2026 21:41:27 GMTqrtoolshttps://selim.services/blog/welcome/https://selim.services/blog/welcome/A short hello and a quick note on what this blog will cover.Wed, 24 Jun 2026 00:00:00 GMTmetawritinghttps://selim.services/blog/adding-russian-locale-astro-blog/https://selim.services/blog/adding-russian-locale-astro-blog/How I added bilingual EN/RU posts to a static Astro blog without a headless CMS: route duplication, shared-slug file pairing, hreflang, and a switcher that finds the counterpart.Sun, 24 May 2026 00:00:00 GMTastroi18nlocalizationcontent-collectionsfrontendhttps://selim.services/blog/three-things-mv3-taught-me-service-worker-lifecycle/https://selim.services/blog/three-things-mv3-taught-me-service-worker-lifecycle/Chrome Manifest V3 replaced the persistent background page with an ephemeral service worker. These are the three lifecycle lessons that cost me real debugging time.Wed, 20 May 2026 00:00:00 GMTbrowser-extensionsmanifest-v3service-workerchromejavascripthttps://selim.services/blog/typed-content-with-zod-build-time-contract/https://selim.services/blog/typed-content-with-zod-build-time-contract/An Astro content-collection Zod schema is not just validation - it is a build-time contract that turns a folder of MDX files into a fully typed CMS with no backend.Tue, 12 May 2026 00:00:00 GMTastrotypescriptzodcontent-collectionsfrontendhttps://selim.services/blog/six-mcp-servers-i-keep-in-every-claude-code-project/https://selim.services/blog/six-mcp-servers-i-keep-in-every-claude-code-project/After six months of running Claude Code across 30 active repos, only 6 MCP servers survived the cull. Here is the kept set, the 14 cuts, and the rule.Sat, 02 May 2026 00:00:00 GMTclaude-codemcpai-engineeringworkflowtoolinghttps://selim.services/blog/why-i-rewrote-my-portfolio-from-nuxt-to-astro/https://selim.services/blog/why-i-rewrote-my-portfolio-from-nuxt-to-astro/I rewrote my portfolio from Nuxt 3 to Astro 5 and tracked every metric that moved. Build time, bundle, Lighthouse, dev boot - the receipts for the swap.Sun, 26 Apr 2026 00:00:00 GMTastronuxtperformanceportfoliofrontendhttps://selim.services/blog/the-30-second-test-what-clients-check-on-your-portfolio/https://selim.services/blog/the-30-second-test-what-clients-check-on-your-portfolio/The 30-second checklist that a senior client actually runs on your freelance portfolio before they decide to message you, listed in real scan order here.Sun, 19 Apr 2026 00:00:00 GMTportfoliofreelanceconversiondesignseniorhttps://selim.services/blog/lighthouse-100-checklist-after-30-sites/https://selim.services/blog/lighthouse-100-checklist-after-30-sites/A checklist for hitting Lighthouse 100/100/100/100 - the architecture decisions, the boring 88-to-94 fixes, and the cargo-cult performance tactics to skip.Sun, 12 Apr 2026 00:00:00 GMTlighthouseperformanceweb-vitalsseoaccessibility