Fullstack Developer (Java / React)

About the RoleWe are seeking an experienced Fullstack Developer to join a core engineering initiative for a leading global wealthtech and fund distribution platform. In this role, you will balance backend and frontend development (approx. 50/50 split) using Java and React to build and scale complex applications supporting global investment fund and asset management processes.Key ResponsibilitiesDevelop robust backend microservices and application components using Java and Spring / Spring Boot.Build modular, responsive frontend user interfaces using React and JavaScript / TypeScript.Design, build, and integrate high-performance REST APIs.Collaborate with international engineering teams on business and technical requirement analysis.Maintain, refactor, and enhance existing applications within a complex, service-oriented architecture.Troubleshoot, debug, and resolve technical issues across full-stack environments.Candidate ProfileLevel of Experience: Mid-Senior level with a proven track record as a Fullstack Developer on enterprise-scale systems.Backend Stack: Strong proficiency in Java and the Spring / Spring Boot framework ecosystem.Frontend Stack: Solid hands-on experience building web applications with React, JavaScript, and TypeScript.API & System Design: Good knowledge of REST API development and integration in complex application environments.Languages: Fluent English required for daily communication within an international project setup.Nice to HavePractical experience with microservices architecture and event-driven messaging (e.g., Kafka).Knowledge of containerization and orchestration tools (Docker, Kubernetes).Exposure to CI/CD pipelines and public cloud platforms (AWS, Azure, or GCP).Prior background in financial services, investment banking, or asset management (specifically investment funds / ETFs).Working Model & LogisticsEmployment Type: B2B ContractLocation: Warsaw, Poland (Hybrid model: 2 days per week in-office)