Java / Kotlin Backend Developer - Scalable SaaS Platform

To strengthen our engineering team in Vienna, we are looking for a Java / Kotlin Backend Developer (m/f/d) who enjoys working on scalable backend systems, contributing to platform stability and performance, and collaborating across teams to continuously improve our product. Tech Stack

Backend: Java, Spring (our Monolith) / Kotlin, Micronaut (all new feature development) Architecture: A pragmatic hybrid architecture with a Java/Spring monolith and Kotlin/Micronaut microservices. The migration is already well advanced, with selected components intentionally remaining in the monolith. Databases: PostgreSQL, MySQL Infrastructure: Docker, Kubernetes, Private Cloud CI/CD: Git-based pipelines Monitoring: Prometheus, Grafana, Elastic Stack Your Environment

You will be working in a cross-functional product team consisting of Backend and Frontend Engineers, QA, DevOps, Product Management, and Architecture.

Current team setup: 4 Backend Developers, 2 Frontend Developers, 1 Software Architect, 1 DevOps Engineer, 1 QA Engineer, 2 Product Managers, 1 Engineering Manager, and CTO.

We are actively growing the team, with plans to expand to 6 Backend Developers and 2 QA Engineers.

The role focuses primarily on new feature development (currently approx. 90%), while also addressing technical debt pragmatically as part of ongoing product development.

• Professional experience developing backend systems using Java.
• Experience working with Kotlin or strong interest in adopting Kotlin in production systems.
• Experience building scalable backend services in a SaaS or distributed systems environment.
• Experience working with Spring, Micronaut or comparable backend frameworks.
• Experience working with relational databases such as PostgreSQL or MySQL.
• Strong understanding of software design principles, clean code and maintainable architectures.
• Experience working in agile development environments.
• A structured and solution-oriented mindset combined with strong analytical thinking.
• Interest in performance optimization, scalability, and backend system design.
• Comfortable working in modern development environments with strong focus on automation and tooling.
• Experience using AI-assisted development tools such as Claude Code is a plus, or openness to integrating such tools into your daily workflow.
• Strong communication skills and the ability to collaborate effectively within a cross-functional team.

With our unified SaaS platform deltaconX, we simplify regulatory compliance, to streamline transaction reporting processes. Since the market launch in 2013, we have been committed to helping businesses meet evolving regulatory demands efficiently.

Our platform is the one stop shop for our clients to be compliant with key regulations like EMIR, MiFIR, SFTR, REMIT, MAS, HKMA and many more. As we continue to grow through our Go-Global initiative and strategic partnerships, we are looking for talented individuals to join us in shaping the future of regulatory compliance and delivering innovative solutions to our clients.

Help us build and scale a backend platform that processes complex regulatory data for international clients in a high-reliability SaaS environment.