Senior Backend Engineer (Java, Kotlin, Spring Boot, AWS)

OBI Smart Technologies is a joint venture between OBI and Reply Group, responsible for co-designing, building and operating mission-critical digital platforms for commerce, customer service, and omnichannel retail. They focus on delivering standardized processes and scalable digital products supporting one of Europe’s largest DIY retailers.

• Completed university degree in Computer Science or a comparable technical field.
• 6+ years of professional experience in backend development using Kotlin and Spring Boot in complex environments.
• Strong expertise in REST APIs, microservices, distributed systems, and event-driven architectures.
• Deep hands-on experience with Kafka and asynchronous processing patterns in production systems.
• Strong experience with AWS and Kubernetes (including Amazon EKS) in scalable environments.
• Solid experience with PostgreSQL and designing performant, reliable data models.
• Experience with CI/CD, containerization, observability tooling, and modern security concepts (OAuth2, IAM).
• Strong communication skills in English and Polish.
• Readiness to work in a hybrid model in Katowice.

• Design and develop scalable backend services, APIs, and integrations using Kotlin and Spring Boot within distributed systems.
• Translate complex business and product data requirements into robust, maintainable, and scalable system designs.
• Lead the design and evolution of event-driven architectures and asynchronous processing using Kafka.
• Design and integrate backend systems within AWS and Kubernetes-based enterprise environments.
• Drive data modeling and persistence strategies using PostgreSQL and cloud-native approaches.
• Act as a technical interface between business, product, and engineering teams, leading solution design and backlog refinement.
• Drive engineering best practices, observability, reliability, and architectural consistency across the platform.
• Lead troubleshooting, optimization, and continuous improvement initiatives while mentoring less experienced engineers.