I help teams launch web apps and AI features, and keep them running. Freelance, available for new projects. TypeScript, React, Next.js, Node.js and AWS.https://axel.dev/https://axel.dev/blog/optimizing-astro-site-for-100-pagespeed/https://axel.dev/blog/optimizing-astro-site-for-100-pagespeed/A practical guide to pushing an Astro site to a 100 PageSpeed score: CSS budgets, fonts, images, and the Speed Index fixes that actually matter.Mon, 20 Jul 2026 00:00:00 GMThttps://axel.dev/blog/post-quantum-jwt-signing/https://axel.dev/blog/post-quantum-jwt-signing/What RFC 9964 adds for JWS, when ML-DSA actually matters versus keeping ES256, and why post-quantum JWE encryption is further off than you think.Wed, 05 Aug 2026 00:00:00 GMThttps://axel.dev/blog/react-visual-regression-testing-cypress-storybook/https://axel.dev/blog/react-visual-regression-testing-cypress-storybook/Use Cypress and Storybook to catch visual regressions in React apps and keep every UI update consistent across browsers and screen sizes.Sat, 20 May 2023 00:00:00 GMThttps://axel.dev/blog/streaming-webm-video-over-html5-with-media-source/https://axel.dev/blog/streaming-webm-video-over-html5-with-media-source/Learn how Media Source Extensions let you inject partial WebM video into an HTML5 player—useful for streaming and progressive playback.Tue, 24 May 2016 00:00:00 GMThttps://axel.dev/blog/timing-safe-equal-comparing-secrets/https://axel.dev/blog/timing-safe-equal-comparing-secrets/Why a normal string comparison can leak confirmation tokens byte by byte, how timingSafeEqual fixes it, and a live benchmark you can run in the browser.Tue, 04 Aug 2026 00:00:00 GMThttps://axel.dev/blog/unicode-usernames-safe-international-validation/https://axel.dev/blog/unicode-usernames-safe-international-validation/Zod username validation for Japanese, Korean, and Cyrillic names, with homoglyph, impersonation and script-mixing checks.Thu, 27 Aug 2026 00:00:00 GMThttps://axel.dev/blog/webtransport-future-of-websockets/https://axel.dev/blog/webtransport-future-of-websockets/How WebTransport overcomes WebSockets and WebRTC limits using QUIC, datagrams, and bidirectional streams—for games and real-time apps.Thu, 20 Jul 2023 00:00:00 GMThttps://axel.dev/blog/when-postmessage-too-slow-shared-memory-patterns/https://axel.dev/blog/when-postmessage-too-slow-shared-memory-patterns/An overview of Web Worker communication: Comlink for control, transferables for big handoffs, and SharedArrayBuffer patterns for high-frequency updates.Tue, 21 Jul 2026 00:00:00 GMT