Are you passionate about creating innovation? Do you enjoy developing groundbreaking digital products that utilize cutting-edge technologies? Are you excited about driving growth in digital wealth management and delivering a unique customer experience? If so, we would love to hear from you!

We are Whitebox, and we believe investing can be fun, simple, and low-risk. Whitebox has started to make digital wealth management accessible to everyone and tailored to individual needs while keeping asset management simple, transparent, and inexpensive.

We are a European fintech company seeking a highly skilled Software Engineer (Java) to architect, build, and scale our core financial systems. You will operate at the intersection of complex financial concepts and high-performance software engineering, focusing on brokerage operations and robo-advisory platforms. We are looking for an engineer who treats code as craft, communicates flawlessly across remote environments, and pragmatically leverages modern AI tools to ship robust, tested software faster.

• Design and maintain high-throughput, fault-tolerant backend services powering our brokerage and robo-trading engines.
• Write exceptionally clean, highly concurrent, and well-tested code primarily in Java.
• Champion Test-Driven Development (TDD) and Behavior-Driven Development (BDD) to ensure the absolute reliability required in financial software.
• Handle complex state management and ensure data integrity across our architecture.

• Containerize applications and ensure smooth local and deployment workflows using Docker.
• Collaborate asynchronously and synchronously in a fully remote, Agile environment.
• Act as a multiplier for your team by integrating AI coding assistants into your workflow for boilerplate, test generation, and refactoring, while maintaining strict architectural oversight (no "vibe coding"). Knowledge on Spec-Driven Development tools is a plus.

• Deep Technical Expertise: Extensive, production-level experience with Java and the JVM ecosystem. You know how to leverage Java for strict performance, concurrency, and reliability.
• Security First: Dealing with financial data requires a paranoid approach to security. Proven experience with secure coding practices, data encryption, OWASP principles, and secure API design is mandatory.
• Testing Champion: Deep commitment to TDD and BDD. You believe untested code is legacy code, especially when dealing with client funds.
• Distributed Systems Transactions: Strong understanding of managing state and ensuring data consistency across distributed systems (e.g., handling complex financial transactions, preventing double-spending, and managing race conditions).

• Pragmatic AI Integration: Proven experience using AI tools as a powerful pair-programmer to multiply productivity and test coverage.
• Remote & Agile Native: Strong track record of thriving in distributed, agile teams.
• Impeccable Communication: You can explain technical decisions to non-technical stakeholders and write clear documentation.
• Infrastructure: Solid experience with Docker and containerized environments.
• Domain Knowledge: Demonstrable understanding of financial markets, brokerage mechanics, and automated/robo-trading concepts.

• Ruby on Rails Knowledge: Experience with Rails to help maintain, interface with, or migrate existing business logic services.
• Rust: Familiarity with Rust (valuable for ultra-low latency execution components).
• European Regulations: Understanding of European financial compliance and regulatory frameworks (e.g., MiFID II).

• FIX Protocol: Experience with the Financial Information eXchange (FIX) protocol for order routing.
• Kubernetes (K8s): Experience working with Kubernetes orchestration.
• CI/CD: Familiarity with deploying code through established Continuous Integration/Continuous Deployment pipelines.

• This position is a permanent, full-time (40h/wk) role.
• Thirty days of paid vacation.
• 100% remote.

• Attractive remuneration package and free choice of hardware.
• Weekly manager one-on-ones, flat hierarchies, and an open-door mentality.

Please send us your CV together with your earliest starting date and salary expectations to jobs@whitebox.eu.

Your contact person is Eneko Taberna.