Senior Fullstack Engineer (Java & React)

Type of contract: Employment contract Salary range: 14600 - 22300 PLN gross What will you do? You will work on large-scale financial services platforms supporting investment banking operations and digital transformation initiatives in a highly regulated environment. The role combines frontend and backend development, cloud-native engineering, and collaboration with business and technology stakeholders to deliver scalable, resilient, and high-performing solutions. Your tasks Design and develop enterprise-grade frontend applications using React and TypeScript Build and maintain backend services based on Java, Spring Boot, and microservices architecture Develop and support cloud-native solutions deployed on Kubernetes platforms Design and implement event-driven integrations using Apache Kafka Create and maintain CI/CD pipelines in GitLab Collaborate with business stakeholders, architects, and cross-functional Agile teams Optimize application performance, scalability, and reliability Contribute to technical design, code reviews, and engineering best practices Support application modernization and process automation initiatives Your skills 7+ years of professional software development experience in enterprise environments Strong expertise in ReactJS, Redux, TypeScript, HTML5, CSS3, and modern JavaScript Deep understanding of React Hooks, Context API, Redux Toolkit, routing, and frontend performance optimization Hands-on experience with Vite and/or Webpack Strong experience with Java 17+ and Spring Boot 3+ Experience with Spring Security, Spring Data JPA, REST APIs, and microservices Excellent knowledge of multithreading, concurrency, JVM tuning, and performance optimization Practical experience with Apache Kafka and event-driven architectures Experience with Kubernetes, Helm, and Terraform Experience creating and maintaining GitLab CI/CD pipelines Strong understanding of distributed systems, scalability, resiliency, and fault tolerance Knowledge of SOLID principles, design patterns, clean architecture, TDD, and secure coding practices Strong communication and collaboration skills Experience working in Agile/Scrum environments Nice to have Experience with AI-assisted development tools such as GitHub Copilot or Microsoft Copilot Experience with Oracle or PostgreSQL databases Familiarity with Azure cloud services Knowledge of Grafana, Prometheus, Splunk, Dynatrace, ELK, or OpenSearch Experience with OpenAPI/Swagger and GraphQL Strong testing background using JUnit 5, Mockito, TestContainers, Playwright, Cypress, or React Testing Library Experience mentoring developers and contributing to engineering standards and architecture decisions We offer Hybrid work in our client's office (Kraków) 3 days a week Working in a highly experienced and dedicated team Benefit package tailored to your needs (medical,…