Senior Java Engineer - Cloud-Native & Architecture Leader

SIX; Warszawa; Hybrid; PLN 220,000 - 260,000; Full time

Job summary

SIX is seeking a Senior Java Software Engineer to advance our cloud-based platforms in a hybrid role. You’ll influence architecture, drive technical excellence, and work with a diverse global team to design high-performance, scalable solutions and modernize application landscapes.

You will own critical backend systems using Java 17/21, Kubernetes/OpenShift, and microservices, while collaborating across product, engineering, and ops teams in a hybrid environment.

Qualifications

• Experience developing large-scale distributed backend applications in Java 17/21.
• Hands-on with Kubernetes/OpenShift, Docker/Podman, and cloud-native development.
• Strong knowledge of REST APIs, JSON, Kafka, and event-driven architectures.
• Experience in designing and operating microservices.
• Advocate of automated testing, CI/CD, observability, and documentation.
• GitLab and modern delivery pipelines experience.
• Excellent communication in English.
• Nice to have frontend tech: JavaScript/TypeScript.

Responsibilities

• Drive Architecture & Design for a scalable, secure application landscape.
• Build innovative solutions using modern Java technologies and cloud-native practices.
• Collaborate with product managers, architects, business stakeholders, and engineers to deliver outcomes.
• Champion technical excellence across performance, data processing, and reliability.
• Own the full lifecycle from design to deployment and support.
• Support DevOps practices and production service enhancements.

Skills

Java 17/21

Kubernetes/OpenShift

Docker/Podman

REST APIs

Kafka

Microservices

CI/CD

GitLab

Observability

JavaScript/TypeScript

Job description

SIX is seeking a Senior Java Software Engineer to advance our cloud-based platforms in a hybrid role. You’ll influence architecture, drive technical excellence, and work with a diverse global team to design high-performance, scalable solutions and modernize application landscapes.

You will own critical backend systems using Java 17/21, Kubernetes/OpenShift, and microservices, while collaborating across product, engineering, and ops teams in a hybrid environment.