> Markdown version of [/videos?event=world-congress-2023&page=64](https://www.wearedevelopers.com/videos?event=world-congress-2023&page=64). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Videos 2243 videos · 24305 moments · 1256.1 hours of content ## All videos ### HTTP headers that make your website go faster Stop overloading your origin servers with redundant data payloads. Mastering HTTP caching headers unlocks precise bandwidth control and instantly accelerates your website's performance. - **Speakers:** Thijs Feryn - **Event:** World Congress 2025 - **Published:** August 20, 2025 - **Duration:** 30:27 - [Watch](https://www.wearedevelopers.com/videos/1676-http-headers-that-make-your-website-go-faster) ### Multithreading in Javascript: A guide to Web Workers Is JavaScript actually single-threaded? Discover how Web Workers unlock true parallelism to offload heavy CPU tasks and guarantee smooth 60 FPS interfaces. - **Speakers:** Dani Coll - **Event:** World Congress 2025 - **Published:** August 20, 2025 - **Duration:** 23:14 - [Watch](https://www.wearedevelopers.com/videos/1673-multithreading-in-javascript-a-guide-to-web-workers) ### Semantic HTML means it's semantic, right? Right? Semantic HTML doesn't guarantee an accessible experience. Discover why screen readers silently ignore your perfectly nested tags, and how to properly audit your accessibility tree. - **Speakers:** Emma Dawson - **Event:** World Congress 2025 - **Published:** August 20, 2025 - **Duration:** 23:13 - [Watch](https://www.wearedevelopers.com/videos/1674-semantic-html-means-it-s-semantic-right-right) ### Oh S***! There's a New Accessibility Law and I'm Not Ready! Overwhelmed by the European Accessibility Act? Unplug your mouse to instantly uncover severe UX traps. Conquer massive accessibility debt one logical step at a time. - **Speakers:** Emma Dawson - **Event:** World Congress 2025 - **Published:** August 20, 2025 - **Duration:** 24:30 - [Watch](https://www.wearedevelopers.com/videos/1671-oh-s-there-s-a-new-accessibility-law-and-i-m-not-ready) ### Your Testing Strategy is broken - lets fix it! Are your green builds masking a broken testing strategy? Stop chasing vanity metrics and learn how example mapping and behavior-driven development can build true software confidence. - **Speakers:** Luise Freese - **Event:** World Congress 2025 - **Published:** August 20, 2025 - **Duration:** 28:12 - [Watch](https://www.wearedevelopers.com/videos/1672-your-testing-strategy-is-broken-lets-fix-it) ### Marko.js: Unsung Hero of Scalable Web Frameworks Battle-tested by eBay since 2014, Marko.js quietly pioneered modern frontend architecture. Discover why this server-first framework processes requests twice as fast as React. - **Speakers:** Eugene Fidelin - **Event:** World Congress 2025 - **Published:** August 20, 2025 - **Duration:** 16:57 - [Watch](https://www.wearedevelopers.com/videos/1669-marko-js-unsung-hero-of-scalable-web-frameworks) ### The Journey of a Pixel in a React Application Stop treating React like a performance black box. Uncover the exact end-to-end journey of a rendered pixel to finally diagnose and fix your hardest frontend bugs. - **Speakers:** Shem Magnezi - **Event:** World Congress 2025 - **Published:** August 20, 2025 - **Duration:** 27:01 - [Watch](https://www.wearedevelopers.com/videos/1667-the-journey-of-a-pixel-in-a-react-application) ### How to add test automation to your project: The good, the bad, and the ugly Test automation is not a spare-time activity. Discover how to avoid hidden implementation traps, align tools with team skills, and treat test scripts as first-class code. - **Speakers:** Augustin Gottlieb - **Event:** World Congress 2025 - **Published:** August 20, 2025 - **Duration:** 26:20 - [Watch](https://www.wearedevelopers.com/videos/1668-how-to-add-test-automation-to-your-project-the-good-the-bad-and-the-ugly) ### Secure and Private AI - DeepMask Build a secure enterprise AI without risking data leaks. DeepMask's zero-retention platform instantly deletes every prompt, guaranteeing your sensitive corporate knowledge never trains external models. - **Speakers:** Hissan Usmani - **Event:** World Congress 2025 - **Published:** August 20, 2025 - **Duration:** 4:57 - [Watch](https://www.wearedevelopers.com/videos/1665-secure-and-private-ai-deepmask) ### Lessons learned from building a thriving Vue.js SaaS application How do you handle volatile state management and weeks-long user sessions in a massive Vue.js app? Uncover the architectural decisions that power a thriving SaaS messaging platform. - **Speakers:** Abdelrahman Awad - **Event:** World Congress 2025 - **Published:** August 20, 2025 - **Duration:** 30:02 - [Watch](https://www.wearedevelopers.com/videos/1666-lessons-learned-from-building-a-thriving-vue-js-saas-application) ### Leapter: The Reinvention of Software Development? A Future Built On AI Generated Code. AI generates code faster than developers can validate it, creating a massive trust gap. Leapter solves this by replacing opaque text with visual, executable blueprints. - **Speakers:** Robert Werner - **Event:** World Congress 2025 - **Published:** August 20, 2025 - **Duration:** 4:17 - [Watch](https://www.wearedevelopers.com/videos/1663-leapter-the-reinvention-of-software-development-a-future-built-on-ai-generated-code) ### Tolgee: Open-Source, In-Context AI Localization That Cuts Dev Effort Does "save" mean keeping data or accumulating money? See how Tolgee's open-source, in-context AI unifies your localization pipeline, eliminates translation ambiguity, and slashes developer effort. - **Speakers:** Jan Cizmar - **Event:** World Congress 2025 - **Published:** August 20, 2025 - **Duration:** 3:36 - [Watch](https://www.wearedevelopers.com/videos/1664-tolgee-open-source-in-context-ai-localization-that-cuts-dev-effort) [Next page](https://www.wearedevelopers.com/videos?page=65)