BackEnd Engineer (Java)

Ambush is a people first company where talented, thoughtful individuals come together to build meaningful products and lasting partnerships.

We believe the best work happens when people feel supported, trusted and empowered to bring their full abilities to the table.

Since 2015, because of our people first and long term mindset, we have grown into a partner relied on by some of the best companies in the world.

We combine strong engineering, design and strategy with a growing strength in AI to help our clients see what is next and achieve bigger outcomes.

At the heart of everything we do is our team.

We collaborate, take risks, lift each other up and take pride in doing work the right way, not settling for a quick makeshift solution.

If you join Ambush, you join a group of people who want you to succeed and who show up for each other every day.

We believe in and expect real teamwork, a constant drive to be better, and delivering meaningful long term outcomes that we can be proud of together.

This role focuses on building and maintaining a high-performance, reactive mid-tier service that powers seamless payment experiences for millions of users.

We’re looking for a Java developer with strong backend fundamentals and hands-on experience building scalable, reactive systems, ideally in payments or fintech environments.

When you join us, you will: Debug production issues in distributed reactive systems.

Write comprehensive unit and integration tests.

Participate in code reviews and architectural discussions.

Optimize application performance and scalability.

Ensure security best practices and PCI compliance.

Collaborate with cross-functional teams on feature development.

Communicate in English on a daily basis, both verbally and in writing.

What we'd like to see in a candidate: You are going to use Java Springboot- Tool Framework Raptor.

Comfortable using CursorAI and Copilot.

At least 1 year working with reactive systems or payment/fintech platforms.

Proven experience debugging and maintaining complex distributed systems.

Strong experience designing and implementing REST APIs.

Strong understanding of object-oriented design, SOLID principles, and design patterns.

Solid knowledge of functional programming concepts (lambdas, streams, Optionals).

Experience with concurrent and multi-threaded programming.

Knowledge of memory management and performance optimization.

Experience level: Senior-level