Software Engineer (Java) - (m/f/d)

About us

Unzer is a leading European fintech company with a mission to simplify international payments for e-commerce and retail businesses. Our brand was formed from 13 companies that now contribute to building a unique product covering the entire payment flow. At Unzer, we are driven by the belief that customers should enjoy a seamless shopping experience, no matter where they choose to shop.

We are a team of over 700 experts of 55 different nationalities, dedicated to creating a state-of-the-art unified commerce platform. Our goal is to enable businesses to delight their customers with a seamless payment experience. Whether you're a tech enthusiast, payment expert, or a dedicated support professional, we are looking for individuals who are passionate about making a difference.

Our offices We are based across Austria, Denmark, Germany and Luxembourg with a HQ in Berlin

About the team

The Foundations group is focused on delivering core platform software products. Starting from gateways, through merchant onboarding and offboarding reaching the billing systems and debtor management solutions of Unzer. What your work will look like: - Design, build, test, and operate cloud-based microservices (Java/Spring Boot, Kafka) - Write automated tests (unit, integration, and end-to-end) as an integral part of your daily work - Contribute to product design by writing technical specifications – clear enough to guide both engineers and AI agents - Use AI-assisted development (coding agents, AI code review, spec-driven workflows) in your daily work and help us evolve how we use it - Work with the Unzer Tech standards and processes and help us improve them - Be actively involved in team and organizational knowledge-sharing What you need to be successful in this role: - 5+ years of experience with Java 21+ and Spring Boot - Solid knowledge of data structures, algorithms, operating systems and distributed systems - Experience with SQL databases (schema design, migrations); NoSQL is a plus - Experience with microservices, event-driven messaging (Kafka, Avro) and Git-based workflows (feature branches, pull requests, code review) - You diligently test (ideally test-first/TDD) and document your deliveries - Experience in architecture design (e.g. Domain-Driven Design) and common design patterns - Experience with observability tools such as Coralogix or OpenTelemetry - Hands-on experience with AI coding assistants/agents (e.g. Claude Code, GitHub Copilot): you use them productively and critically review, test and own the code they produce - Hands-on mentality Nice to have: - Frontend experience with Angular - Know-how in delivering software to the AWS cloud platform - Experience with Docker, Kubernetes and GitOps (e.g. Argo CD) - Experience building agentic workflows (MCP integrations, custom agent skills, AI steps in CI such as automated PR review) - Experience in regulated environments (payments, PCI-DSS, GDPR) What’s next?