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. The company focuses on implementing standardized processes and scalable digital products to support one of Europe’s largest DIY retailers, advancing internationalization and digital mindset among partners.

• 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, with 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.