Java / Kotlin Backend Developer - Scalable SaaS Platform

Location: Vienna, Austria

Working hours: Fulltime (38,5 Hours/ Week)

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.

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.

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

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.

Responsibilities

• Design, develop and maintain backend services using Java and Kotlin within our SaaS platform

• Work closely with product management, frontend engineers and QA to deliver reliable and scalable features

• Contribute to architectural discussions and technical decision-making together with our Software Solution Architect and technical leads

• Ensure high code quality through testing, code reviews and continuous improvement of engineering practices.

• Support the operation and stability of our platform in collaboration with DevOps and infrastructure teams.

• Work on improving system performance, scalability, and reliability of core backend services.

• Contribute to evolving our backend architecture in a growing SaaS environment.

• Continuously improve development workflows, tooling and engineering practices together with the team.

Requirements

• 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.

Benefits

• A meaningful role working on a modern SaaS platform in a highly regulated domain.

• Direct impact on product development and technical decisions in a small, experienced team.

• An international working environment with close collaboration across teams and locations.

• Flexible working hours with a hybrid working model (60% onsite, 40% home office).

• A modern office in the myHive Twin Towers at Wienerberg with excellent infrastructure. 

• Opportunities for continuous professional and personal development. 

• Flat hierarchies and short decision-making paths. 

• MacBook as your development machine.

• Subsidized gym membership

• Annual Wiener Linien public transport pass or equivalent contribution toward a parking space (parking subject to additional monthly cost)

• Secure bike parking with shower facilities

• Private pension plan after 2 years with the company

We are dedicated to cultivating a fair and inclusive workplace rooted in trust and mutual respect. Embracing diversity is fundamental to our success, and we strive to build a team that reflects a broad range of backgrounds, perspectives, and talents.

For this position, we offer a gross annual salary starting at EUR 62.664,– according to the valid IT collective agreement with the willingness to overpay according to qualifications and professional experience.