java developer for a cloud-native platform

The engineering team develops core backend services for a modern, cloud-native platform.

• Design and develop modular backend services using Java and Spring Boot
• Build event-driven and asynchronous solutions based on Apache Kafka
• Implement resilient messaging patterns, including outbox, idempotent consumers, retries, and dead-letter queues
• Design and develop REST APIs following agreed API standards and contract-first practices
• Implement business logic, workflow automation, and rule-driven processing
• Integrate services with internal and external systems using REST, messaging, Kafka Connect, CDC, and other integration patterns
• Contribute to event and schema governance using Avro, JSON Schema, Schema Registry, or similar technologies
• Work with relational databases using SQL, JPA/Hibernate, and transactional processing
• Improve the performance, reliability, and scalability of backend services and event flows
• Support distributed tracing, monitoring, and troubleshooting across distributed systems
• Collaborate with architects, QA, and platform teams to deliver production-ready solutions

• Strong commercial experience with Java, preferably Java 17+
• Very good knowledge of Spring Boot
• Hands-on experience with Apache Kafka and event-driven systems
• Good understanding of event-driven architecture and asynchronous processing
• Knowledge of messaging patterns such as retries, idempotency, dead-letter queues, and delivery guarantees
• Experience designing and implementing REST APIs, ideally using OpenAPI
• Good understanding of distributed systems concepts, including ordering, eventual consistency, and failure handling
• Strong experience with relational databases and SQL
• Practical knowledge of JPA/Hibernate, transactions, and database performance optimisation
• Strong understanding of OOP, clean architecture, and maintainable software design
• Experience troubleshooting performance and reliability issues in distributed or asynchronous systems
• Ability to translate business requirements into reliable backend solutions
• English allowing effective communication in an international engineering environment
• Будет плюсом: Experience with Kafka Connect, Debezium, and/or Change Data Capture (CDC), experience with Avro, Schema Registry, or event schema governance, knowledge of CQRS, Saga, and/or Event Sourcing patterns, experience with workflow or rules engines such as Camunda or Drools, familiarity with caching and enterprise integration patterns, experience with observability, distributed tracing, and monitoring of backend services, experience with cloud-native environments, particularly AWS or other public cloud platforms, experience integrating applications with AI models or AI platforms

• 130 - 150 PLN/h on B2B
• 15 600 - 18 000 PLN gross on UoP
• Relocation package worth 4500 PLN total, paid in three installments of 1500 PLN per month if permanent office presence is mandatory and relocation from another city is needed
• Extended medical care for the candidate and their family, covering over 2000 medical facilities in Poland and 80 in Kraków
• Multisport card
• Life insurance