Full-stack ownership building Juno's guest travel and payments platform

This is a full-stack Software Engineer role on Ramp's Juno team, building the guest booking experience, coordination tools for travel admins, and the payments/expense infrastructure (virtual cards, spend controls, reimbursements) that moves real money across currencies. The JD explicitly wants engineers who default to ownership and move fluidly between TypeScript/React frontend and PostgreSQL-backed backend systems, including shipping AI-powered agents for coordination tasks.

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What this interview tests

Full-stack ownership across frontend (TypeScript/React) and backend (PostgreSQL) systems
Designing payment/expense infrastructure handling real money across currencies
Integrating third-party booking and payment APIs
Systems thinking — anticipating ripple effects of a change
Bias toward ownership and shipping in ambiguity
Building AI-powered agents to reduce coordination overhead