About this role
Type of contract: B2B contract Salary range: 155 - 205 PLN/H What will you do? You will work on large-scale financial services platforms supporting investment banking operations. The role focuses on digital transformation, process automation, data integration, and application modernization in a highly regulated environment. You will contribute across both backend and frontend development while leveraging modern cloud-native technologies, AI engineering tools, and DevOps practices. Your tasks Design and develop scalable microservices-based applications using Java and Spring Boot Build and maintain modern frontend solutions using React and TypeScript Implement and optimize integrations with PostgreSQL and Kafka Collaborate with business stakeholders and development teams to deliver high-quality solutions Develop and maintain automated tests ensuring application quality and reliability Deploy and support applications running on Kubernetes platforms Create and maintain CI/CD pipelines using GitLab Participate in application modernization and process automation initiatives Contribute to technical discussions and architectural decisions Utilize AI engineering tools to improve development efficiency Requirements Strong backend development experience using Java 17+ and Spring Boot 3+ Experience designing and developing microservices-based architectures Good knowledge of PostgreSQL Good knowledge of Kafka Strong frontend development expertise using ReactJS, Redux, TypeScript, HTML5, CSS3 and modern JavaScript (ES6+) Experience with .NET and C# Experience with AI engineering tools such as GHCP CLI Understanding of Generative AI concepts and frontier models Strong communication skills Strong domain knowledge of Stock Borrow Loan business Experience with automated testing using JUnit 5, Mockito, Testcontainers or similar tools Understanding of structured context in codebases such as AGENTS.md and skills Practical knowledge of Kubernetes, Helm and Terraform Experience with GitLab CI/CD pipelines for build, test, packaging and deployment automation Openness to work hybrid from our client's office (Kraków) 3 days a week Nice to have Splunk Grafana Application Insights