Staff Software Engineer (Java)

About the Position

We are looking for a Staff Software Engineer (Java) to join our BUX team based in Amsterdam. Our engineering team sits at the heart of the company. We have a well-rounded team that cares about building great products that matter. You’ll be part of a modern fintech company where you can try things, break things, fix them, and learn fast. Your work is visible, your input matters, and you help shape both the product and how we build it. We stay close to what’s happening in the world of investing and fintech, and we share what we learn. It’s a place where you can stretch your skills, contribute to something real, and grow alongside people who take their craft seriously and enjoy building things together.

Responsibilities

• Take project requirements, design solutions, and document them in RFCs (Request for Comments)
• Follow, learn, apply, and advocate for modern software development practices across the team and organisation
• Analyse technical challenges (e.g., scalability), raise awareness of technical debt, and proactively address system issues before they impact users
• Help grow the technical skills of less experienced colleagues and collaborate across teams on planning and execution of broader impact projects
• Discuss technical solutions with Product Owners, support colleagues with complex problems, and diagnose and resolve live user issues or monitoring alerts in a thought-out, planned, and organised manner

Requirements

• Excellent command of Git and collaborative workflows (e.g., GitFlow)
• Excellent knowledge of core system-design concepts and common microservices design trade-offs
• Ability to own, be responsible and accountable for the success of projects where own direct code contribution is combined with mentoring of less experienced colleagues
• Excellent command of Java, Kotlin and the Spring framework ecosystem
• Experience working with transactional Kafka and event-sourcing architectures
• A solid understanding and working knowledge of GCP (with focus on Kubernetes)
• You take initiative and push hard to turn ideas into real results
• You regularly use GenAI tools, stay up to date with new ones, and encourage the team to use them to speed up delivery and improve how everyone works
• A keen eye for detail while always keeping the big picture in mind
• An Agile mindset and working knowledge of the Scrum framework

We Offer

• You will have space to share your ideas and be encouraged to express your voice
• You will be one of the most skilled technical people in the room, with the authority to make the decision
• You will be challenged to work with real-time data and develop APIs that can provide a smooth user experience through high-quality, high-performance code
• You will have the freedom to evaluate new tools that can be used to increase productivity, code readability, and maintainability
• Lastly, the business domain is interesting. You will learn how the financial system works on the inside

About the Company

At BUX, we make investing accessible and affordable for everyone through our intuitive app. We believe a diverse team, rich in backgrounds, skills, and perspectives, is key to driving innovation and serving our customers better. We are dedicated to creating an inclusive workplace where everyone feels safe, valued, and empowered to bring their full selves to work.

Contact

Georgiana Luncanu

Talent & Projects Manager – People