/ Recent content on Erwan Joly Hugo en-us Sun, 12 Jul 2026 00:00:00 +0000 /blog/cron-is-stateless-your-mortgage-isnt/ Sun, 12 Jul 2026 00:00:00 +0000 /blog/cron-is-stateless-your-mortgage-isnt/ Why cron can&#39;t express &#39;every second Friday&#39;, why that&#39;s a feature and not a bug, and why I ended up replacing cron with RFC 5545 RRULEs in WealthRelay - then open-sourcing a React form to edit them. /blog/risk-is-a-terrible-word-for-volatility/ Sun, 12 Jul 2026 00:00:00 +0000 /blog/risk-is-a-terrible-word-for-volatility/ Finance says &#39;risk&#39; and means &#39;standard deviation&#39;. Everyone else hears &#39;chance of losing everything&#39;. That one mistranslation makes cash look safe, index funds look like gambling, and a yen look calmer than it is - depending on where you&#39;re standing. /blog/sso-account-prehijacking/ Thu, 18 Jun 2026 00:00:00 +0000 /blog/sso-account-prehijacking/ Account pre-hijacking is not one attack: it&#39;s two, with very different preconditions and severity. Here&#39;s how to tell them apart, why triagers keep getting it wrong, and how to reproduce both from scratch. /blog/hotchocolate-graphql-to-react-form/ Thu, 01 Sep 2022 00:00:00 +0000 /blog/hotchocolate-graphql-to-react-form/ Turn any GraphQL mutation or query into a rendered React form using schema introspection, graphql-to-json-schema, and react-jsonschema-form - no hand-written UI per operation. /blog/hotchocolate-validation-attributes/ Wed, 31 Aug 2022 00:00:00 +0000 /blog/hotchocolate-validation-attributes/ How to expose .NET ValidationAttributes as GraphQL schema directives and generate matching Yup validators automatically - so the frontend never drifts from the backend rules. /cv/ Mon, 01 Jan 0001 00:00:00 +0000 /cv/ <div class="cv-header"> <img class="cv-qr" src="/qr.png" alt="QR code" /> <h1>Erwan Joly</h1> <p class="cv-subtitle">Staff Software Engineer</p> <div class="cv-contact"> <a href="mailto:erwanjoly@gmail.com">✉ erwanjoly@gmail.com</a> <a href="https://github.com/erwan-joly" target="_blank" rel="noopener">⌥ github.com/erwan-joly</a> <a href="https://linkedin.com/in/erwan-joly" target="_blank" rel="noopener">in linkedin.com/in/erwan-joly</a> <span>📍 New Zealand</span> </div> <button class="cv-download" onclick="window.print()">↓ Save as PDF</button> </div> <h2 id="profile">Profile</h2> <p>Engineer from ISEN (French Higher Institute for Electronics and Digital Training), certified MCSA: Web Applications. Strong focus on clean architecture, GraphQL, and delivering high-quality features with simplicity. Track record of driving technical decisions as an early-stage employee and introducing best practices across teams. Open-source lead developer (NosCore, OpenNos). Founder of MarketRacoon, a personal finance SaaS product.</p>