Software Engineer (Java) - (m/f/d) arbeitnow Unzer Berlin · 10/25/2026

Primetime; Berlin; Hybrid; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Hybrid work model

Annual learning budget

Company pension plan

Confidential counselling

Deutschlandticket mobility

EU remote up to 15 days/year

Job summary

Unzer, a leading European fintech, is seeking a seasoned Java/Spring Boot expert to design and operate cloud-native microservices. You will write tests, shape technical specs for engineers and AI agents, and continuously improve our AI-driven development processes.

You’ll work within the Foundations group on an onsite basis in Berlin, contributing to scalable, secure payment platforms. You will collaborate across teams, apply domain-driven design, and utilize Kafka, SQL/NoSQL databases, and

Qualifications

• 5+ years of Java 21+ and Spring Boot experience in distributed systems.
• Strong knowledge of data structures, algorithms and OS concepts.
• Experience with SQL databases and NoSQL is a plus.
• Experience with microservices, event-driven messaging and Git-based workflows.
• Test-first mindset and ability to document complex deliveries.
• DDD and common design patterns experience; observability tooling familiarity.
• Proficiency with AI coding assistants and critical review of generated code.

Responsibilities

• Design, build, test, and run cloud-based microservices (Java/Spring Boot, Kafka).
• Write automated tests as part of daily work and ensure quality.
• Contribute to product design via clear technical specs for engineers and AI agents.
• Leverage AI-assisted development and evolve our use of AI in workflows.
• Adhere to Unzer Tech standards and actively share knowledge within the team.

Skills

Java 21+

Spring Boot

Microservices

Kafka

SQL databases

NoSQL

Distributed systems

Git workflows

TDD / testing

DDD

OpenTelemetry

Coralogix

AI coding assistants

Tools

Docker

Kubernetes

GitOps (Argo CD)

AWS

Job description

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‑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.

Type: Onsite

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 WE OFFER

More than a workplace. A place to grow.

At Unzer, colleagues from 50+ nationalities across four countries work together to create better outcomes for our merchants. We take ownership, move with pace, and keep raising the bar—as one team.

We set high expectations and give you the flexibility, learning opportunities and practical support to do your best work, grow your impact, and build a sustainable career.

Flexibility that works
Combine focused time at home with connection and collaboration in the office. Our hybrid setup includes two office days per week.

Your commute, your choice
Choose the mobility benefit that works for you: bike leasing or a Deutschlandticket.

Work from anywhere in the EU
Change your perspective and work from another EU country for up to 15 days per year.

Keep raising the bar
Use an annual learning budget of €1,000 for courses, conferences, certifications and other development opportunities that help you grow and increase your impact.

Support when you need it
Access confidential counselling whenever you need support with personal or professional matters.

Build your future
Look ahead with our company pension scheme and take care of your long-term financial wellbeing.

Benefits may vary by location and employment setup. Your recruiter will share the details relevant to your role.

Unzer is an equal employment opportunities workplace, and we commit to hiring regardless of race, sex, gender identification, sexual orientation, national origin, native language, religion, age, disability, marital status, citizenship, genetic information, pregnancy, or any other characteristic protected by law. Please refrain from including your picture and age with the application.

This overview was written from the original listing to help you understand the role. Always confirm the specifics on the employer’s application page.