Java developer in banking

Hays Contracting Services is a collaboration based on B2B principles. We are currently looking for a B2B contractor to provide services in the area of Senior Java Developer.

• Developing software using Java and Spring
• Preparing technical documentation
• Working in a Scrum team

• At least 5 years of experience as a Java Developer
• Experience in the banking sector
• Very good knowledge of Java and the Spring Framework, including Spring Boot
• Experience with microservices architecture: design, integrations, observability, and resilience
• Databases: Oracle and PostgreSQL, including modeling, optimization, and working with SQL
• Documented experience working with legacy code and modernizing/rewriting systems: refactoring, strangler pattern, staged migrations, and regression testing
• Systems thinking, critical thinking, a focus on quality and rapid learning, and the ability to collaborate and share knowledge
• Knowledge of migration and modernization patterns, e.g. gradual domain extraction and API contracts
• Practical experience using LLMs and AI agents in software development, e.g. code, test, analysis, documentation, and migration generation
• Ability to critically evaluate AI output: verify its correctness, security, quality, and compliance with requirements and standards

• Hybrid work, one day a week in Warsaw
• B2B contract
• 12-month contract, with the possibility of extension
• Start: January
• Rate: PLN 130–160/hour net on B2B