On is seeking a Fullstack Engineer with expertise in TypeScript for their Berlin office. This role focuses on backend development using TypeScript and Nest.js framework. The position requires hands-on experience with TypeScript on the backend and familiarity with Nest.js. As a fullstack engineer, you'll be working on both frontend and backend aspects of the applications, though there seems to be a stronger emphasis on backend development. The company provides a structured application process and considers international candidates, as indicated by the visa sponsorship question in the application form. The role appears to be based in Berlin, suggesting an opportunity to work in one of Europe's most vibrant tech hubs. The position likely involves working with modern JavaScript/TypeScript ecosystems and contemporary web development practices.