J'ai crashé mon SaaS avec 10 000 users en direct (Claude Code)

What if I launched 10,000 users on my SaaS at the same time? 😅 In this video, I use Claude Code to run a live load test on my live quiz application (Next.js + Supabase) — from 100 to 10,000 simultaneous users, visualizing everything in Chrome: registrations, answers, latency, real-time rankings, and error rate. On the agenda: ✅ How Claude Code generates and manages a visual testing harness ✅ Simulation of 100 → 500 → 1000 → 5000 → 10,000 users ✅ 70,000 requests processed, 0 errors: the real latency figures ✅ The ranking bug hidden beyond 1000 players (and how to fix it) ✅ The real limitations to know before a large-scale live stream 🔗 Useful links 👉 Claude Code: https://claude.com/claude-code 👉 My SaaS: (your link) 💬 Do you already use Claude Code or another AI agent for coding? Tell me in the comments how far you've pushed your tests! 👍 Subscribe to Code With Lionel for more videos on development, AI, and SaaS. #ClaudeCode #SaaS #AI #LoadTesting #WebDevelopment #VibeCoding #NextJS #Supabase Contact me: https://lionel-dev.site Email: [email protected] Optimized Prompt Generation Site: https://specpilote.run/ 📚 Access my complete training courses: 🔹Create and Manage Your Databases with SQL Learn to master SQL from A to Z and manipulate databases like a pro. 👉 https://ebookdev.mychariow.shop/exper... 🔹 Create a REST API with Node.js and MySQL – Complete Guide Build professional APIs used in businesses. 👉 https://ebookdev.mychariow.shop/creer... 🔹Git for Developers: Version Control, Collaborate, and Deploy Like a Pro Master Git and work effectively in a team. 👉 https://ebookdev.mychariow.shop/git-p... 🔹Python for Junior Developers: Practical Guide and Projects Ideal for getting started and creating your first real-world projects. 👉 https://ebookdev.mychariow.shop/pytho... 🔹Complete HTML Training – From Beginner to Independent Learn to create modern and structured web pages. 👉 https://ebookdev.mychariow.shop/forma... 🔹 PROMPT ENGINEERING – The Complete 2026 Training Master AI and learn to create powerful prompts. 👉 https://ebookdev.mychariow.shop/promp... 🔹 Complete SQL Training: Become a Pro in Database Programming Go from beginner to advanced in SQL. 👉 https://ebookdev.mychariow.shop/prd_y... 🔹 Limitless Brain: The Scientific Method to Never Forget Anything Again in 30 Days Improve your memory and learning ability. 👉 https://ebookdev.mychariow.shop/cerve... 🔹 Achieve a Higher Rank: Master Flashcards and Spaced Repetition Learn faster and retain information longer. 👉 https://ebookdev.mychariow.shop/objec... 🔹 Professional Website Creation for Your Brand Create a modern website to grow your business. 👉https://ebookdev.mychariow.shop/prd_a... ================================================================== Contact me: [email protected] ======================================================================= 🚀 Launch your website or web project (hosting recommended) Want to get your website or application online quickly, with good performance and robust security? 👉 Hostinger (the platform I personally use) 🔹 Fast 🔹 Secure 🔹 Suitable for Node.js / MySQL projects 🎁 Exclusive discount: https://www.urlr.me/yHzckF Promo code: Z4DLIONELXFR ====================================================================== 📢 Support the channel 🙏 👍 Like the video 🔔 Subscribe to the channel 📤 Share with a friend developer ================================================================ 10,000 users at once: is my SaaS holding up? (Claude Code) — 80/100 I push my SaaS to its limits with Claude Code (+10,000 users) — 85/100 🔍 Keywords (YouTube SEO) Create a SaaS with Claude Code See how Quiz Live handles traffic with real-time load testing. Watch this demonstration to understand how the application metrics behave under pressure. This video provides a technical look at the Quiz Live platform, specifically focusing on its performance during simulated user interaction. If you are building web applications and need to understand how your system responds to increased traffic, this walkthrough shows how to monitor key performance indicators. We examine multiple instances of the Quiz Live interface to track stability and response times. Whether you are running a Python dictionary quiz or managing large-scale events, observing these load testing scenarios helps clarify how metrics like rupture and load impact overall reliability. You will see firsthand how the system manages concurrent participation. Subscribe for weekly software testing breakdowns, and comment which web application performance metric you want us to test next.