(Senior) Kotlin / Java Software Engineer - Trading Platform (m/f/x)

Scalable GmbH; Belgique; On-site; EUR 70,000 - 110,000; Full time

Benefits offered by this job

International relocation support

Opportunity to work from abroad

Competitive compensation package

Company pension scheme

Deutschland Jobticket 50% monthly

Job summary

Scalable Capital is seeking experienced backend developers to join a brand-new banking platform. You will design, build, and operate high-availability services handling the trading lifecycle, from order intake to post-trade processing, using Kotlin/Java and Spring Boot in a distributed environment.

Join an autonomous agile team and collaborate with product, operations, risk, and other engineers to translate complex trading workflows into robust APIs, with cloud-native tooling, CI/CD, and

Qualifications

• 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 considerationsand 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, operationsand 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 andauditabilityis a strong plus.

Responsibilities

• 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.

Job description

Scalable Capital is a leading digital investment and banking platform with a full banking licence, empowering people across Europe to shape their own finances. Scalable Broker makes it easy and affordable for clients to invest professionally in stocks, ETFs, cryptocurrencies, and derivatives, as well as set up savings plans. Scalable Wealth, the digital wealth management service, offers clients professional investment in ETF portfolios, and is also adopted as a white-label solution by banks and other B2B partners. The company’s offerings are rounded off by attractive interest rates, loans, and private equity. With the European Investor Exchange, Scalable Capital offers an exchange specifically for retail investors. Over one million clients have already entrusted more than €50 billion to the platform.

Founded in 2014, Scalable Capital now employs over 700 people across Munich, Berlin, Vienna and Milan. Together with the founding and management team, including Erik Podzuweit and Florian Prucker, they are working on a new generation of financial services.

Visit our finance blog or check out our Social Media channels to find out what our Expert Teams have to say.

Our Company Values guide us every day in how we work and collaborate. To learn more about them, you can find our values here (English).

We are looking for experienced backend developers to work on our brand new banking platform!

• 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.
  

• 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 considerationsand 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, operationsand 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 andauditabilityis a strong plus.

• 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