--- title: "Theo (@toflou) | Hashnode" description: "Building tools I wish I had as a data engineer. Read the latest articles by Theo on Hashnode." url: "https://hashnode.com/@toflou" --- @toflou # Theo @toflou · Paris, FR · Joined September 2025 Building tools I wish I had as a data engineer. ### [Test GitHub App Webhooks Locally with Node.js, Express, and taupi](https://louvelab.hashnode.dev/test-github-app-webhooks-locally-node-express-taupi?utm_source=hashnode&utm_medium=feed) Introduction GitHub Apps are a great way to automate repository workflows: label new issues, react to pull requests, sync repository metadata, enforce internal policies, or trigger deployments. Most GitHub Apps are event-driven, which means your app ... 13 min read · [louvelab.hashnode.dev](https://louvelab.hashnode.dev/test-github-app-webhooks-locally-node-express-taupi?utm_source=hashnode&utm_medium=feed) [May 11](https://hashnode.com/posts/test-github-app-webhooks-locally-node-express-taupi/6a02549d72889df14b8f8327) ### [Test Stripe Webhooks Locally in Next.js with Secure Tunnels](https://louvelab.hashnode.dev/test-stripe-webhooks-locally-in-next-js-with-secure-tunnels?utm_source=hashnode&utm_medium=feed) Learn how to test Stripe webhooks in a local Next.js app using taupi secure tunnels, signature verification, and realistic test events. 14 min read · [louvelab.hashnode.dev](https://louvelab.hashnode.dev/test-stripe-webhooks-locally-in-next-js-with-secure-tunnels?utm_source=hashnode&utm_medium=feed) [May 11](https://hashnode.com/posts/test-stripe-webhooks-locally-in-next-js-with-secure-tunnels/6a02488efca21b0d4b6b6ce1) ### [Building a ChatGPT App with Next.js 16.1and MCP](https://blog.datadef.io/building-a-chatgpt-app-with-nextjs-161and-mcp?utm_source=hashnode&utm_medium=feed) Learn to build a ChatGPT app with Next.js and MCP. Discover setups, tools, debugging, and workflows for seamless app development 5 min read · [blog.datadef.io](https://blog.datadef.io/building-a-chatgpt-app-with-nextjs-161and-mcp?utm_source=hashnode&utm_medium=feed) [Dec 29, 2025](https://hashnode.com/posts/building-a-chatgpt-app-with-nextjs-161and-mcp/6952bb1be38329e629f261f5) ### [What I learned debugging a factory at 5 AM](https://blog.datadef.io/what-i-learned-debugging-a-factory-at-5-am?utm_source=hashnode&utm_medium=feed) Maintain data integrity, use contextual anomaly detection, and create tailored dashboards for operations and maintenance 10 min read · [blog.datadef.io](https://blog.datadef.io/what-i-learned-debugging-a-factory-at-5-am?utm_source=hashnode&utm_medium=feed) [Dec 1, 2025](https://hashnode.com/posts/what-i-learned-debugging-a-factory-at-5-am/692dffd9a4078e25220611e8) ### [Datadef v0.1.2 — Starter Templates, Drawing Revolution, and Professional Dashboard](https://blog.datadef.io/datadef-v012-starter-templates-drawing-revolution-and-professional-dashboard?utm_source=hashnode&utm_medium=feed) Discover Datadef v0.1.2: intuitive templates, professional drawing tools, and a collaborative dashboard for streamlined data lineage diagrams 4 min read · [blog.datadef.io](https://blog.datadef.io/datadef-v012-starter-templates-drawing-revolution-and-professional-dashboard?utm_source=hashnode&utm_medium=feed) [Sep 25, 2025](https://hashnode.com/posts/datadef-v012-starter-templates-drawing-revolution-and-professional-dashboard/68d5b33caca55e36c71b9847)