Senior Full Stack Developer (React / Node.js )

Polonia

Senior Full Stack Developer (React / Node.js / Graph Data)

Project Overview Join a newly formed, high-impact delivery team in Poland responsible for the end-to-end evolution of a sophisticated web application powered by Graph Database technology . We are moving the project’s heart to Poland and looking for a Senior expert who can bridge the gap between complex data structures and world-class user interfaces.

The Role As a Full Stack Developer with a strong emphasis on React , you will be responsible for crafting the visual and interactive elements of applications that visualize complex financial and ownership networks. While the backend is built on Node.js , your primary challenge will be turning intricate graph data into seamless, high-performance UI components.

Key Responsibilities

React Excellence: Lead the development of complex, data-driven web applications using React and TypeScript .
Graph Visualization: Transform raw graph data into interactive, responsive UIs using D3.js, GoJS , or similar libraries.
Backend Services: Develop and maintain scalable APIs and microservices using Node.js and TypeScript .
Data Integration: Work closely with graph engineers to integrate real-time GraphQL data and high-end AG Grid reports.
Performance: Optimize the frontend to handle and render large-scale, nested datasets without lag.
Architecture: Maintain reusable components in Storybook and ensure a consistent, scalable codebase.

Technical Requirements (Must Have)

7+ years of experience in software development.
Expert React & TypeScript: Deep knowledge of modern React patterns and performance tuning.
Node.js & TypeScript: Solid experience in building server-side applications and REST/GraphQL APIs.
State Management: Extensive experience with Redux .
Modern Tooling: Proficiency with Storybook for component-driven development.
English: High proficiency ( B2/C1 ) for daily collaboration with US and Netherlands-based stakeholders.

Nice to Have

Data Viz: Experience with D3.js, GoJS , or Cytoscape .
Graph Databases: Familiarity with Neo4j, AWS Neptune , or Cypher/Gremlin queries.
Reporting: Advanced knowledge of AG Grid .