Staff Software Engineer (Java)

Staff Backend (Java) Engineer – BUX Amsterdam, North Holland, Netherlands 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.

Seniority level: Mid‑Senior level

Employment type: Full‑time

What you will do

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

What you need to succeed

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 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

Why join BUX as a Staff Backend Engineer?

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

International work environment

Company pension plan

Flexibility is at our core; we offer a hybrid work environment (1‑2 days at the office)

Working from home allowance

Mobility benefit

Learning budget and full access to our learning and development platform

A1 Dutch language course for you (and your partner)

Delicious lunches at the office

The possibility to work from abroad for 1 month every 12 months

Take care of your mental and emotional well‑being with unlimited appointments with psychologists or coaches through OpenUp

Regular team gatherings and fun company events

BUX for everyone At BUX, we’re committed to making investing accessible and affordable for everyone through our intuitive app. We believe that a diverse team with a range of backgrounds, skills, and perspectives is key to achieving this mission. By embracing diversity, we strengthen our ability to innovate and serve our customers better. To fully benefit from our diversity, it’s essential that everyone feels safe, included, and valued. We are dedicated to creating a workplace where each of us can bring our full selves to work and contribute to our shared goals.

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