What this interview will probe
Build and own backend services in Mercury's roughly two-million-line Haskell codebase that powers banking, payments, and treasury products for over 300,000 startups, designing type-safe APIs and data models on PostgreSQL while collaborating closely with product and frontend teams. You'd ship features end-to-end against high-availability, money-movement systems where correctness is non-negotiable. A technical interview would probe your ability to model a domain with strong static types, reason about purity and effects in Haskell, and design schemas and transactions that keep financial state consistent under concurrency.
ExoForm is not affiliated with Mercury. This is an independent practice page.