Sebastian Hader

About Sebastian

Sebastian is a co-founder at Sonic and co-leads our engineering work streams. He specializes in conceptualizing, designing, and executing complex, large-scale software products, primarily through scalable backend technology.

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Sebastian is also responsible for Sonic's engineering recruitment practice and contributes to various internal recruiting processes with our partners. He kickstarted his engineering career at Mapify by building the backend architecture behind the mobile apps that quickly gained widespread use. At Sameday Health, Sebastian co-led the development of the core booking flow product, which became the backbone of the rapidly expanding US-based company and processed millions of bookings as well as their associated payments.

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Personally, Sebastian enjoys spending time outdoors with his dog "Monti" and activities such as climbing, swimming, and gardening.