Supersonik seeks Senior Engineers to join our core team in Barcelona. You will tackle complex technical problems, shape product architecture from day one, and thrive in a fast-growing startup. You should be fluent in modern Python, async programming, and adept at building scalable, event-driven systems. You’ll work across frontend to infrastructure to deliver high-performance demos. If you love first-principles thinking, ambiguity, and delivering products people love, you’ll fit right in with