--- title: "Mattia Carcione (@xeno-js) | Hashnode" description: "Mattia Carcione (@xeno-js) writes on Hashnode. Read their latest articles and follow their work." url: "https://hashnode.com/@xeno-js" --- @xeno-js # Mattia Carcione @xeno-js · Joined September 2026 ### [Where Should Request Validation Live in a TypeScript Application?](https://xeno-js.hashnode.dev/where-should-request-validation-live-in-a-typescript-application?utm_source=hashnode&utm_medium=feed) Explore why validation belongs at the application boundary, how pipelines separate validation from HTTP, and how Xeno.JS implements this approach. 10 min read · [xeno-js.hashnode.dev](https://xeno-js.hashnode.dev/where-should-request-validation-live-in-a-typescript-application?utm_source=hashnode&utm_medium=feed) [Oct 7](https://hashnode.com/posts/where-should-request-validation-live-in-a-typescript-application/6ac64239a72b603c8c0dbf15) ### [Why I Created Xeno.JS: Architectural Rigor and Zero Infrastructure Constraints](https://xeno-js.hashnode.dev/why-i-created-xeno-js-architectural-rigor-and-zero-infrastructure-constraints?utm_source=hashnode&utm_medium=feed) Discover why Xeno.JS was created to solve technical debt and infrastructure lock-in in modern TypeScript applications. 4 min read · [xeno-js.hashnode.dev](https://xeno-js.hashnode.dev/why-i-created-xeno-js-architectural-rigor-and-zero-infrastructure-constraints?utm_source=hashnode&utm_medium=feed) [Oct 3](https://hashnode.com/posts/why-i-created-xeno-js-architectural-rigor-and-zero-infrastructure-constraints/6ac14714bac13faf39ff8227) ### [Xeno.JS vs NestJS: Different Approaches to TypeScript Application Architecture](https://xeno-js.hashnode.dev/xeno-js-vs-nestjs-different-approaches-to-typescript-application-architecture?utm_source=hashnode&utm_medium=feed) Looking for a NestJS alternative? Compare Xeno.JS and NestJS for TypeScript application architecture, dependency injection, CQRS, pipelines, HTTP, and transport independence. 10 min read · [xeno-js.hashnode.dev](https://xeno-js.hashnode.dev/xeno-js-vs-nestjs-different-approaches-to-typescript-application-architecture?utm_source=hashnode&utm_medium=feed) [Oct 1](https://hashnode.com/posts/xeno-js-vs-nestjs-different-approaches-to-typescript-application-architecture/6abe8d6dcb5b3e74131062e7)