Senior Backend Engineer — Payments Team (Python)

About InvestEngine We’re a London-based fintech on a mission to make ETF investing simple and accessible. Over 150,000 clients have trusted us with over £3 billion in assets — and we’re just getting started. We’ve been featured by MoneyWeek , Finder and Forbes , and we’re growing fast with big ambitions. About the Role We’re looking for a Senior Backend Engineer to join our Payments Team and help us strengthen and scale a business-critical part of our platform. You’ll work on complex backend challenges across payment flows, integrations and system reliability. You’ll contribute to architecture, improve system stability and scalability, and help evolve the technical foundations of our Payments domain. You’ll collaborate closely with Engineering, Product, Compliance, Operations and other business teams to build reliable solutions and improve critical operational processes. What You’ll Do Design, develop and maintain backend services in Python 3.11 using Django / DRF Contribute to the architecture and long-term technical development of our Payments systems Build and improve RESTful APIs and integrations Work with complex backend and legacy systems and identify root causes of technical problems Continuously improve system performance, reliability and scalability Investigate and resolve production issues and recurring problems Work with MySQL and Redis Participate in architectural discussions and contribute to technical decisions Identify and reduce technical debt Improve developm