Senior Backend Platform Engineer — Payin (Hybrid UK)

Wise in London is looking for a mid–senior backend engineer to join the Payin Platform team. You will build the Payin Session and Payment abstractions that let product teams integrate payment methods once and scale to millions of transactions.

You will own a high‑volume platform used across Wise, focusing on correctness, reliability, and thoughtful API design, collaborating with product teams, and driving end‑to‑end customer value with data‑driven decisions.