Senior Java Software Engineer

SIX Group Services Ltd.; Warszawa; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Flexible Work Models

Personal Development

Agile Working Methods

Job summary

SIX Group Services Ltd. in Warsaw is seeking a Senior Java Software Engineer to help evolve cloud-based platforms. You will work with an international team to design, build, and modernize high-performance software powering financial services.

You will own architecture decisions, champion technical excellence, and collaborate across product, architecture, and engineering teams in a flexible hybrid work environment.

Qualifications

• Proven experience building large-scale backend applications in Java 17/21.
• Hands-on with Kubernetes/OpenShift and container tech (Docker/Podman).
• Strong understanding of REST APIs, JSON, and Kafka.
• Experience designing and operating microservices.
• Advocate for automated testing, CI/CD, observability, and documentation.
• Experience with GitLab and modern delivery pipelines.
• Professional fluency in English, written and spoken.

Responsibilities

• Drive architecture and design of a scalable, secure application landscape.
• Develop and enhance business-critical Java functionality with cloud-native practices.
• Collaborate with product, architecture, and engineering teams to deliver outcomes.
• Lead performance optimization, reliability, and code quality initiatives.
• Contribute across the software development lifecycle from design to deployment.
• Participate in DevOps activities to operate and improve production services.

Skills

Java 17/21

Kubernetes/OpenShift

REST/JSON/Kafka

Microservices

CI/CD & observability

GitLab

English communication

Job description

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What sets us apart drives us ahead: between local roots and global relevance, we are a unique blend of tradition and future, of foundation and growth. We value bright minds and inspire them to grow with their ideas. Come and shape the future of finance with us.

Senior Java Software Engineer

Warsaw | 1 | Reference 8325

Are you passionate about building robust, scalable software that powers critical financial services? Do you thrive in an environment where you can influence architecture, drive technical excellence, and work with modern cloud-native technologies? If so, we'd love to hear from you.

As a Senior Java Software Engineer, you will play a key role in the evolution of our cloud-based platforms, working alongside a diverse international team of engineers, architects, and product experts. You will help design and deliver high-performance solutions, modernize application landscapes, and contribute to products that create real value for our customers.

This role offers the opportunity to work with modern technologies, take ownership of technical decisions, and collaborate in a flexible hybrid work environment.

What You’ll Do

• Drive Architecture & Design: Contribute to the design and evolution of a complex application landscape, ensuring solutions are scalable, secure, and maintainable.
• Build Innovative Solutions: Develop and enhance business-critical functionality using modern Java technologies and cloud-native engineering practices.
• Collaborate Across Teams: Partner with product managers, architects, business stakeholders, and fellow engineers to deliver impactful outcomes.
• Champion Technical Excellence: Lead initiatives focused on performance optimization, data processing, system scalability, reliability, and code quality.
• Own the Full Lifecycle: Contribute throughout the software development lifecycle, from design and implementation to deployment, support, and continuous improvement.
• Support DevOps Practices: Actively participate in operating and enhancing production services as part of a DevOps culture.

What You’ll Bring

• Strong Java Expertise: Proven experience developing large-scale, distributed backend applications using Java 17/21.
• Cloud-Native Engineering: Hands‑on experience with Kubernetes/OpenShift, container technologies (Docker/Podman), and cloud-based application development.
• API & Event-Driven Systems: Solid understanding of REST APIs, JSON, Apache Kafka, and event-driven architectures.
• Microservices Architecture: Practical experience designing, building, and operating microservice-based solutions.
• Modern Engineering Practices: Strong advocate of automated testing, code reviews, CI/CD, observability, and technical documentation.
• Version Control & DevOps Tooling: Experience working with GitLab and modern software delivery pipelines.
• Excellent Communication: Strong collaboration and communication skills, with professional proficiency in spoken and written English.

If you have any questions, check out our FAQ page or call Agnieszka Leputa at .

For this vacancy we only acceptdirect applications.

Diversity is important to us. Therefore, we are looking to receiving applications regardless of any personal background.

What We Offer

• Flexible Work Models
  We trust our employees and offer a work environment that is well-balanced, productive and fosters success.
• Personal Development
  You will benefit from a culture of continuous learning and feedback. Your personal growth is supported through an extensive learning offering.
• Agile Working Methods
  Whether through scrum or design thinking,
  we solve exciting tasks together in teams.