Senior Java Developer

Quick Facts

• Location: Kraków, Poland (Hybrid: 3 days/week from the Kraków office)
• Contract: B2B

Description

We are looking for an experienced Java Developer to join an international project. You will build Java-based microservices with Spring Boot, including Spring Batch and Spring Cloud, and work across REST APIs and GraphQL. AI-related skills such as Spring AI or LangChain are a strong plus.

Responsibilities

• Develop and maintain Java microservices using Spring Boot
• Design and implement REST APIs and GraphQL schemas
• Model and manage data using NoSQL (e.g., Azure Cosmos DB)
• Build streaming/data-pipeline features using Confluent Kafka
• Implement authentication and authorization using OAuth 2.0 and Microsoft Entra ID
• Work with Azure services such as App Services, Azure Monitor, and API Management
• Collaborate with product managers, designers, and engineers in an Agile environment
• Ensure high code quality, maintainability, and documentation

Requirements

• 8+ years of experience with Java and Spring Boot
• Experience with Spring Batch and Spring Cloud
• Experience building microservices
• Proficiency in REST API and GraphQL schema design
• Experience with NoSQL data modeling (e.g., Azure Cosmos DB)
• Experience with data streaming (e.g., Confluent Kafka)
• Knowledge of authentication/authorization protocols (OAuth 2.0, Microsoft Entra ID)
• Familiarity with Azure Cloud Services (App Services, Azure Monitor, API Management)
• Strong English communication skills and ability to adapt technical content for diverse audiences
• Strong commitment to quality, maintainability, documentation, and continuous learning
• AI-related skills (e.g., Spring AI or LangChain) are a strong plus

Benefits

• International and experienced team
• Professional development opportunities
• Stable, long-term cooperation
• Opportunity to work with AI-related technologies