Senior Backend Engineer — Payments Team (Python)

Location: London, United Kingdom Workplace: fully 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 £3.5 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 development processes, code quality and engineering practices Collaborate with Product, Compliance, Operations and Business teams Contribute to the evolution of our architecture and internal engineering tools What We’re Looking For 4+ years of experience in backend development Strong Python skills and deep knowledge of Django or similar frameworks Solid understanding of relational databases, caching and high-performance backend systems Experience with REST APIs, service design and distributed systems Experience working with complex or legacy systems Ability to independently investigate complex technical problems and identify root causes Experience working with production systems and improving their stability Strong ownership and ability to make sound technical decisions Familiarity with Git, CI/CD practices and modern engineering workflows Strong communication and problem-solving skills English B2+ and fluent Russian Nice to Have Experience working in fintech, payments or another regulated industry Familiarity with AWS and Docker Experience with RabbitMQ, Kafka or other message brokers Experience with payment providers or financial integrations Contributions to open source or personal side projects How We Work We’re a lean, collaborative team where engineers have a real influence on architecture, technical decisions and engineering culture. We value ownership, curiosity and continuous improvement . You’ll have the autonomy to make technical decisions and work on meaningful, business-critical systems without micromanagement or unnecessary bureaucracy. Within the Payments team, you’ll help build systems that remain stable, reliable and scalable as the business grows . What We Offer Impact from day one — work on business-critical Payments systems Technical growth — influence architecture and technical decisions Hands-on engineering — solve complex backend challenges across production systems Modern tech stack — Python 3.11, Django, MySQL, Redis, AWS, GitHub, TeamCity Remote-first and flexible — work from anywhere, at your own pace Unlimited vacation — take time off when you need it, no fixed limits Supportive team — thoughtful, skilled colleagues who care about quality and results Hiring Process Intro call with our Talent team Technical interview with the Backend team Gamified cognitive assessment to understand how you think and problem-solve Final conversation with our CTO