Frontend engineer with 14+ years of experience. I specialize in the architecture between design and production.https://rachel.fyihttps://rachel.fyi/posts/what-i-took-from-addy-osmanis-agent-skillshttps://rachel.fyi/posts/what-i-took-from-addy-osmanis-agent-skillsFour skills from the agent-skills repo that changed how I plan, build, and document work with AI coding agents.Thu, 16 Apr 2026 04:00:00 GMThttps://rachel.fyi/posts/useref-vs-usestate-streaminghttps://rachel.fyi/posts/useref-vs-usestate-streamingA recruiter screen I bombed led me to dig into how React's primitives behave differently when chunks arrive every 50 milliseconds.Wed, 01 Apr 2026 05:00:00 GMThttps://rachel.fyi/posts/why-banning-useeffect-is-really-about-agentshttps://rachel.fyi/posts/why-banning-useeffect-is-really-about-agentsFactory's useEffect ban made headlines as a DX play. Their CEO said the thing nobody was talking about — they did it for agent effectiveness.Thu, 26 Mar 2026 05:00:00 GMThttps://rachel.fyi/posts/gravity-centers-typescript-migrationhttps://rachel.fyi/posts/gravity-centers-typescript-migrationHere's what Patreon's seven-year, 11,000-file migration actually teaches us about doing it right.Thu, 05 Mar 2026 05:00:00 GMThttps://rachel.fyi/posts/every-home-is-a-uihttps://rachel.fyi/posts/every-home-is-a-uiRetrofitting my home for my mom's hip replacement taught me that accessibility follows the same rules everywhere. Physical spaces are just another interface.Mon, 23 Feb 2026 05:00:00 GMThttps://rachel.fyi/posts/shared-brain-achieving-zero-wait-states-with-optimistic-uihttps://rachel.fyi/posts/shared-brain-achieving-zero-wait-states-with-optimistic-uiRun the same logic on frontend and backend. Eliminate drift, get instant feedback and zero-wait states.Wed, 04 Feb 2026 05:00:00 GMThttps://rachel.fyi/posts/how-i-use-cursor-to-plan-and-shiphttps://rachel.fyi/posts/how-i-use-cursor-to-plan-and-shipHow I use Cursor's planning tool and Composer to build production apps with testable deliverables and proper sequencing.Thu, 29 Jan 2026 05:00:00 GMThttps://rachel.fyi/posts/say-less-with-cursor-ruleshttps://rachel.fyi/posts/say-less-with-cursor-rulesHow I use .cursor/rules and glob patterns to enforce standards without cluttering context.Wed, 28 Jan 2026 05:00:00 GMThttps://rachel.fyi/posts/your-ci-is-running-tests-on-old-code-how-to-auto-cancel-github-actionshttps://rachel.fyi/posts/your-ci-is-running-tests-on-old-code-how-to-auto-cancel-github-actionsPushing multiple commits quickly? You're probably paying for 3-4 parallel test runs testing outdated code.Sun, 25 Jan 2026 05:00:00 GMThttps://rachel.fyi/posts/per-user-jwt-secretshttps://rachel.fyi/posts/per-user-jwt-secretsSecure your OpenSaaS with per-user JWT secrets, encrypted storage, and surgical token revocation for external clients.Tue, 20 Jan 2026 05:00:00 GMThttps://rachel.fyi/posts/building-recipecasts-chrome-extensionhttps://rachel.fyi/posts/building-recipecasts-chrome-extensionThere are plenty of Chrome extensions that extract recipes from websites. So why build another one?Sun, 11 Jan 2026 05:00:00 GMThttps://rachel.fyi/posts/production-ready-external-auth-cors-token-refresh-api-implementation-with-wasphttps://rachel.fyi/posts/production-ready-external-auth-cors-token-refresh-api-implementation-with-waspFrom prototype to production: strict CORS policies, efficient token refresh, and battle-tested patterns that keep your external auth system secure.Tue, 30 Dec 2025 05:00:00 GMThttps://rachel.fyi/posts/implementing-external-client-authentication-with-wasphttps://rachel.fyi/posts/implementing-external-client-authentication-with-waspIf you're building an OpenSaaS app and want to extend it beyond the browser tab, this is the blueprint.Fri, 19 Dec 2025 05:00:00 GMThttps://rachel.fyi/posts/the-missing-guide-to-sentry-source-maps-in-vite-web-workershttps://rachel.fyi/posts/the-missing-guide-to-sentry-source-maps-in-vite-web-workersFix Sentry's "Could not determine debug ID" warnings for Web Worker bundles. Get readable stack traces instead of minified gibberish in your error reports.Thu, 27 Nov 2025 05:00:00 GMThttps://rachel.fyi/posts/building-an-ai-code-reviewer-in-2-dayshttps://rachel.fyi/posts/building-an-ai-code-reviewer-in-2-daysTired of playing code review whack-a-mole on solo projects? I built an AI tool that handles the systematic stuff (security, performance, TypeScript issues) so you can focus elsewhere.Tue, 09 Sep 2025 04:00:00 GMThttps://rachel.fyi/posts/setting-up-sentry-with-vite-and-sourcemapshttps://rachel.fyi/posts/setting-up-sentry-with-vite-and-sourcemapsA step-by-step guide to adding Sentry error tracking with source map support to your Vite app, so you get meaningful stack traces instead of minified code.Sat, 01 Mar 2025 05:00:00 GMThttps://rachel.fyi/posts/google-killed-their-cookbook-app-so-im-building-my-ownhttps://rachel.fyi/posts/google-killed-their-cookbook-app-so-im-building-my-ownAfter Google discontinued their Nest Hub cookbook feature, I needed a way to display recipes without a printer or messing up my phone.Sat, 22 Feb 2025 05:00:00 GMThttps://rachel.fyi/posts/tidytextcc-copy-paste-to-google-docs-now-with-support-for-fractionshttps://rachel.fyi/posts/tidytextcc-copy-paste-to-google-docs-now-with-support-for-fractionsAdding fraction support to TidyText.cc: from Markdown to MathJax to the Canvas API, and why LaTeX fractions need special handling to paste into Google Docs.Mon, 30 Sep 2024 04:00:00 GMThttps://rachel.fyi/posts/i-built-a-clean-copy-tool-for-chatgpt-called-tidytextcchttps://rachel.fyi/posts/i-built-a-clean-copy-tool-for-chatgpt-called-tidytextccAfter working with ChatGPT and other AI tools, I realized that copying and pasting responses into Google Docs often messed up the formatting.Tue, 24 Sep 2024 04:00:00 GMThttps://rachel.fyi/posts/accessible-alternatives-convenience-or-compromisehttps://rachel.fyi/posts/accessible-alternatives-convenience-or-compromiseCome for the education, stay for the low-key dragging of luxury retailer Maison Alaïa's alternate version.Sun, 23 Jun 2024 15:22:00 GMThttps://rachel.fyi/posts/why-confirming-choices-mattershttps://rachel.fyi/posts/why-confirming-choices-mattersAccessibility isn't just about aiding users with disabilities; it helps everyone feel safe browsing the web without fear of doing something irreversible.Tue, 11 Jun 2024 12:21:00 GMThttps://rachel.fyi/posts/the-importance-of-independent-volume-controlhttps://rachel.fyi/posts/the-importance-of-independent-volume-controlAccessibility isn't just about aiding users with disabilities; it helps everyone feel safe browsing the web without fear of doing something irreversible.Fri, 07 Jun 2024 09:42:00 GMThttps://rachel.fyi/posts/handling-a-change-to-redux-form-data-from-container-to-component-via-propshttps://rachel.fyi/posts/handling-a-change-to-redux-form-data-from-container-to-component-via-propsAn alternative to React context: passing Redux Form data changes from container to component via props, using getFormValues and connect.Tue, 07 Nov 2017 05:00:00 GMThttps://rachel.fyi/posts/tinkering-with-cartodb-to-make-data-visualizationshttps://rachel.fyi/posts/tinkering-with-cartodb-to-make-data-visualizationsCleaning 150,000 records of messy OSHA data with OpenRefine and visualizing chemical exposure in New York State on an interactive CartoDB map.Wed, 01 Jul 2015 04:00:00 GMThttps://rachel.fyi/posts/building-a-nutrition-facts-web-component-with-polymerhttps://rachel.fyi/posts/building-a-nutrition-facts-web-component-with-polymerA walkthrough of building a reusable nutrition facts web component with Polymer at GDG DevFest, using custom elements and a service element to import JSON data.Mon, 03 Nov 2014 05:00:00 GMThttps://rachel.fyi/posts/connecting-zendesk-and-google-spreadsheets-using-google-apps-scripthttps://rachel.fyi/posts/connecting-zendesk-and-google-spreadsheets-using-google-apps-scriptManage date-related deadlines with an integration between a Google Sheet and Zendesk’s ticketing system.Sun, 08 Dec 2013 05:00:00 GMThttps://rachel.fyi/posts/controlgroupcom-built-using-jekyllhttps://rachel.fyi/posts/controlgroupcom-built-using-jekyllHow we rebuilt Control Group's site with Jekyll: static generation, no CMS, and the performance gains that came with it.Fri, 19 Oct 2012 04:00:00 GMT