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Scalable Capital, a leading European fintech platform with over 1 million clients and €50 billion in assets under management, is seeking a Senior Kotlin/Java Software Engineer to join its Trading Platform team in Berlin.
You will be part of a highly motivated, cross-functional team building and operating the core trading infrastructure. Your responsibilities will include designing, building, and evolving business-critical services that support the complete trading lifecycle—from order intake and validation through execution, status updates, and post-trade processing. You will develop reliable, scalable, and observable backend services using Kotlin, Java, and Spring Boot in a distributed, event-driven environment.
Key responsibilities:
- Design and implement backend services for time-sensitive financial data processing
- Work across product, operations, risk, and engineering teams to translate complex trading processes into resilient software models and APIs
- Build integrations with internal platforms and external trading venues
- Own services from architecture through production deployment, monitoring, and continuous improvement
- Ensure the platform meets high standards for correctness, performance, availability, security, and auditability
- Contribute to raising engineering standards through improved reliability, automation, observability, and developer experience
- Work in an autonomous agile team using modern practices: code reviews, automated testing, CI/CD, cloud infrastructure, and infrastructure as code
The role offers the opportunity to work on a fast-growing fintech platform serving European retail and institutional investors, with exposure to sophisticated financial systems, regulatory compliance, and high-performance distributed systems.
Qualifications:
- University degree in computer science, engineering, or comparable qualification
- Strong professional experience building production backend services with Kotlin or Java and Spring Boot
- Experience designing and operating distributed, event-driven, high-availability systems with clear API and service boundaries
- Solid understanding of Domain-Driven Design and ability to model complex business workflows in maintainable software
- Demonstrated ability to work on latency-sensitive, high-throughput systems, including performance analysis, monitoring, capacity planning, and failure-mode design
- Experience designing, operating, and optimizing data persistence for backend services, including relational databases (PostgreSQL/MySQL) and NoSQL databases (DynamoDB)
- Strong engineering-quality mindset: clean, secure, testable, documented, maintainable code with ownership of production services
- Familiarity with cloud-native development and operations, ideally AWS, Docker, Terraform, CI/CD pipelines, monitoring, and observability tooling
- Strong analytical skills and clear communication with engineering, product, operations, and business stakeholders
- Experience with financial-market systems requiring strict operational controls and auditability is a strong plus
