Fullstack Developer (50% Java + 50% React)

About the Role

We 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 Responsibilities

• Develop 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.

Working Model & Logistics

• Employment Type: B2B Contract
• Location: Warsaw, Poland (Hybrid model: 2 days per week in-office)

Candidate Profile

• Level 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 Have

• Practical 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).