Frontend Product Engineer — Real-Time UI & DX

Callimacus is building a next-generation web platform in Milan, Italy, on-site. You will shape rendering, SDKs, and component systems for enterprise frontends, delivering fast, on-brand experiences with streaming and edge delivery.

You’ll work closely with a founder-led team, tackle hard frontend problems, and own parts of the platform from day one. This role emphasizes performance, DX, and real impact on customer experiences.

Own the rendering path including streaming and hydration. Build the TypeScript SDK for enterprise frontends. Design the component and composition system. Optimize performance and Core Web Vitals. Strong TypeScript and React knowledge. Track record of shipping polished production frontends. Excellent DX and developer experience as a product surface. Equity Top-tier salary Milan offices Health insurance Wellbeing budget Meals served all day