Senior Fullstack Developer – React / Node.js

CLEEVEN is a European consulting company founded on two fundamental beliefs:

• The excellence of European engineers should be a driver of global competitiveness.
• Our human mission is to support our consultants in their personal and professional development.

Project Context

As part of our projects in Artificial Intelligence and enterprise software development, we are looking for a Senior Frontend focused Fullstack Developer with strong expertise in React and Node.js.

You will contribute to the evolution of an enterprise conversational AI platform, enhancing its user experience, performance and integration with AI-powered services.

The focus is on improving an existing application, developing reliable frontend and backend components, and delivering secure, scalable solutions in a cloud environment.

Your Responsibilities

• Develop and enhance a conversational web application using React, TypeScript and Node.js.
• Build reusable, responsive and accessible frontend components.
• Develop Node.js backend services and integrate external APIs.
• Connect the application with AI, search and knowledge-management services through REST APIs.
• Implement secure authentication and authorization mechanisms (SSO, OIDC).
• Deploy and maintain containerized applications on AWS.
• Improve application performance, security, reliability and monitoring.
• Develop automated tests and contribute to CI/CD pipelines.
• Collaborate with product owners, UX designers, architects and engineering teams.

Key Skills:

• Strong hands-on experience with React / ReactJS and modern frontend development.
• Solid Node.js expertise for backend development and API integration.
• Advanced proficiency in TypeScript and JavaScript.
• Good understanding of REST APIs, authentication and system integration.
• Experience implementing enterprise authentication mechanisms such as SSO and OIDC.
• Practical experience with AWS, Docker and containerized deployments.
• Experience developing interactive web applications, ideally conversational interfaces or chatbots.
• Strong knowledge of frontend performance, security, accessibility and testing.
• Experience with Git, CI/CD and modern software engineering practices.

Nice to Have:

• Experience with conversational AI, Generative AI or RAG applications.
• Knowledge of AWS ECS / Fargate.
• Familiarity with Python-based AI services.
• Experience with application monitoring, product analytics or dashboards.
• Familiarity with design systems and AI-assisted development tools.

Your Profile

• Degree in Computer Science, Software Engineering or equivalent experience.
• Significant experience developing and maintaining enterprise web applications.
• Strong frontend expertise combined with the ability to deliver backend integrations.
• Ability to improve existing applications while maintaining clean and scalable code.
• Pragmatic, autonomous and solution-oriented mindset.
• Strong communication skills and ability to collaborate with cross-functional teams.

Speak soon!!