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

lemon.markets operates a Brokerage-as-a-Service platform that lets fintechs, banks and wealth managers reach capital markets through a single API, and is part of the dwpbank group. As a backend engineer in the Investing domain you design and own the services behind the brokerage API platform, spanning the full securities lifecycle: instruments and market data, orders and trades, portfolios and positions, taxes, clearing and settlement, corporate actions and reporting. You work end to end in a cross-functional team with internal and external partners on secure, resilient systems for customer and institutional order workflows, including batch trading, transfers, transaction reporting and market abuse screening. The role carries real influence over architecture of the core platform. The stack is Python, FastAPI, AWS and Postgres, though the team hires technology-agnostically.