(Senior) Backend Engineer - Banking (f/m/x)

lemon.markets runs a Brokerage-as-a-Service platform that gives fintechs, banks and wealth managers API access to capital markets, and is part of the dwpbank group. In this role you design and own reliable, scalable backend services in the Banking domain, covering settlements, payments, ledger accuracy and reconciliation so that money moves safely for partners and their customers. You take end-to-end ownership within a cross-functional team, helping meet regulatory and contractual SLAs and tracking partner-visible incidents that could affect trust and assets under custody. The work carries significant weight in architectural decisions on the core platform and systems. The stack is Python, FastAPI, AWS and Postgres, although the company is technology-agnostic when hiring.