Backend API Developer (m/w/d)

Wallstreetonline Capital Ag

Berlin permanent

Posted: October 24, 2025

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Required Skills

Java Spring Framework REST APIs microservices test automation contract testing continuous integration scalable backend systems financial systems collaboration

Job Description

Your mission:
In this role, you will be responsible for developing and enhancing our Trading API. You design and implement performant and reliable interfaces based on Java and Spring, contributing significantly to the stability and scalability of our systems. A key focus of your work will be ensuring quality and availability through automated testing, contract testing, and clean, maintainable code. You will collaborate closely with our backend and infrastructure teams, optimize existing services, and develop new features that enable a seamless trading experience for our customers. With your work, you help ensure that our API meets the high standards of the financial industry and continues to serve as a solid foundation for innovative products.

Your profile:
Technical Expertise: Strong knowledge of Java and the Spring Framework. Experience with REST APIs, microservices, and modern development tools (e.g., Git, CI/CD) is expected. Quality Assurance: Practical experience with test automation, contract testing, and continuous integration to ensure reliable and stable APIs. Architectural Understanding: Experience in designing and maintaining scalable, maintainable backend systems. Financial and Trading Knowledge: Familiarity with financial systems or previous experience in a trading environment is an advantage. Working Style: Structured and independent approach with a strong sense of ownership and collaboration within development teams.

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