Senior Kotlin / Java Software Engineer - Trading Platform

Job Description

• Be part of a highly motivated, cross-functional team building and operating Scalable Capital’s Trading Platform.
• Design, build, and evolve business-critical services supporting the trading lifecycle—from order intake and validation through execution, status updates and post-trade processing.
• Develop reliable, scalable, and observable backend services using Kotlin, Java, and Spring Boot in a distributed, event-driven environment.
• Work with product, operations, risk, and other engineering teams to translate complex trading processes into clear, resilient software models and APIs.
• Build integrations with internal platforms and external trading venues, ensuring robust processing of time-sensitive financial data.
• Take ownership from idea to production: contribute to architecture, implementation, testing, deployment, monitoring, and continuous improvement.
• Help ensure the platform meets high standards for correctness, performance, availability, security, and auditability.
• Work in an autonomous agile team using modern software-development practices, including code reviews, automated testing, continuous integration and delivery, cloud-based infrastructure, and infrastructure as code.
• Raise engineering standards by improving reliability, automation, observability, developer experience, and operational processes.
   

Qualifications

• A university degree in computer science, engineering or a 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 the ability to model complex business workflows in maintainable software.
• Demonstrated ability to work on latency-sensitive, high-throughput systems, including performance analysis, monitoring, capacity considerations and failure-mode design.
• Experience designing, operating and optimising data persistence for backend services, including relational databases such as PostgreSQL/MySQL and NoSQL databases such as DynamoDB.
• A strong engineering-quality mindset: clean, secure, testable, documented, maintainable code and ownership of services in production.
• Familiarity with cloud-native development and operations, ideally AWS, Docker, Terraform, CI/CD pipelines, monitoring, and observability tooling.
• Strong analytical skills and clear, audience-appropriate communication with engineering, product, operations and business stakeholders.
• Experience with designing and operating gRPC services, including protobuf-based API design, backward-compatible schema evolution, error handling and observability, is a plus.
• Experience with financial-market systems requiring strict operational controls and auditability is a strong plus.

Additional Information

• Be part of one of the fastest-growing and most visible Fintech startups in Europe, creating innovative services that have a substantial impact on the lives of our customers
• Work with an international, diverse, inclusive, and ever-growing team that loves creating the best products for our clients
• Be productive with the latest hardware and tools
• Learn and grow by joining our in-house knowledge sharing or career development sessions and spending your individual Education Budget 
• Learn and experience German culture first hand by joining our free German language classes
• International relocation support is provided if required 
• Opportunity to work from abroad
• Benefit from an attractive compensation package and from the company pension scheme
• Monthly contribution of 50% for the ‘Deutschland Jobticket’
• Say goodbye to order commissions and say hello to your complimentary subscription of Scalable Capital's PRIME+ Broker
• Enjoy flexible and discounted sports activities with Urban Sports Club