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Unzer

Senior Software Engineer – Java

Unzer

Senior Backend Developer in the Paylater team of Unzer, a payment platform. Involved in building invoicing software and working on strategic products for merchants.

Posted 4/29/2026full-timeVienna • 🇦🇹 AustriaSenior💰 €75,000 - €80,000 per yearWebsite

Tech Stack

Tools & technologies
AWSCloudDockerJavaKafkaKotlinKubernetesMavenMongoDBOraclePostgresSplunkSpringSpring BootSpringBoot

About the role

Key responsibilities & impact
  • Contribute to building our Paylater solutions**
  • Develop and work with the newest AI models and coding agents during daily work **
  • Work in an agile, cross-functional team in one of our several locations **
  • Design and plan APIs, based on the Open API 3.0 specification **
  • Implement new and optimize existing services in our complex environment **
  • Ensure the quality of your code with unit testing, continuous integration, and delivery**
  • Creating and improving complex, well-designed domain logic for transaction processing of invoicing, installments, and supporting services.

Requirements

What you’ll need
  • You have experience working in a distributed environment with Git, Maven, Java, and Spring Boot**
  • You have working experience with development with AI assistance**
  • You have experience with relational and non-relational databases. Mostly Oracle, PostgreSQL, but MongoDB is an advantage.**
  • You have worked with Docker and K8s. Cloud concepts ideally with AWS**
  • You are passionate about technology and are familiar with modern architectural paradigms**
  • You have knowledge or experience about messaging - for example, Kafka.**
  • You have an agile mindset, development according to Agile methodology (SCRUM)**
  • You think that clean code matters and strive for continuous improvement **
  • You have great communication skills and are fluent in English ** **Nice to have
  • Worked with monitoring tools like Splunk, OpenSearch**
  • You have experience in deployments with Helm & ArgoCD**
  • You have knowledge of Kotlin **
  • Experiences with batch job operations or processing of larger amounts of data

Benefits

Comp & perks
  • Work from home up to 60% of the time.
  • Mobility support, whether you choose Swapfiets, Jobrad, or a Deutschlandticket - we've got you covered.
  • Explore counseling assistance, be it for professional or personal matters, through our associated platform.
  • Pension scheme, we want to give back and help you secure your future.
  • 15 days a year of workation from your desired destination within the EU.
  • Flexible working hours – helping you balance work and life
  • Learning budget of 1000 euros per year – you can develop your passions with us.
  • Enjoy some fun moments with your coworkers – we throw a company party once a year and host several team events!

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools
JavaSpring BootAI developmentOraclePostgreSQLMongoDBDockerKubernetesKafkaKotlin
Soft Skills
agile mindsetcommunication skillscontinuous improvement