Fullstack Developer

Fullstack Developer
Cluj-Napoca
Cluj-Napoca, Cluj County, Romania

Yopeso has been developing a diverse range of software products, from
- scale applications to smaller solutions, for 20 years. With a growing team of over 300 employees across five locations, we are dedicated to fostering a culture of growth, transparency, and professionalism.

At Yopeso, we value authenticity, curiosity, and ambition. These values drive us to build strong connections within our community and with our partners, ensuring trust, integrity, and transparency in all our business practices. We strive to maintain the highest professional standards and continuously challenge ourselves to develop
- quality,
- performance, and secure software solutions.

Our approach is rooted in efficient collaboration among passionate professionals working in agile teams. Guided by curiosity and ambition, we strive to create products that are meaningful and impactful, while remaining true to our authentic selves.

What we offer:

• Competitive remuneration
• Remote work
• 24 days off per year and floating days
• Private clinic health services Regina Maria Medical Insurance
• Flexible benefits through Up multibenefits platform
• Referral bonus scheme
• Team events, online or at the office
• Training and development opportunities with allocated budget
• Professional Certifications
• Knowledge sharing context

About the Role:

We are looking for a Full Stack Developer to join our team and work on an open-source AI chat platform. You will help build and improve a modern application that integrates multiple AI providers and delivers a smooth user experience.

What You’ll Do:

• Develop and maintain both frontend and backend parts of the application
• Build new chat features and integrate AI providers
• Work with React on the frontend and Node. js / Express on the backend
• Design and optimize databases (Mongo
  DB, Postgre
  SQL)
• Implement real-time features (Web
  Sockets)
• Integrate AI models using modern protocols and standards (including MCP – Model Context Protocol)
• Write clean, testable code and participate in code reviews
• Deploy and maintain the application using Docker

Tech Stack:

Frontend

• React (Type
  Script)
• Vite
• Tailwind
  CSS
• React Query, React Router

Backend

• Node. js & Express
• Mongo
  DB (Mongoose)
• Postgre
  SQL
• Redis
• REST APIs, authentication (JWT / sessions)

AI & Integrations

• Experience with MCP (Model Context Protocol)
• Integration with LLM providers (Open
  AI, Anthropic, etc. )
• Understanding of prompt design and AI workflows

Dev
Ops

• Docker & Docker Compose
• Environment and configuration management

Required Experience:

• 3+ years of Full Stack experience (Java
  Script / Type
  Script)
• 2+ years of React experience
• 2+ years of Node. js / Express experience
• Hands-on experience with Mongo
  DB
• Experience with containerized applications (Docker)
• Experience integrating AI systems using MCP or similar protocols

Soft Skills:

• Strong
  - solving and debugging skills
• Good communication and teamwork
• Ability to work independently
• Attention to code quality and detail
• Interest in AI technologies

Nice to Have:

• Experience with
  - time applications (Web
  Sockets)
• Kubernetes experience
• Testing tools (Jest, Cypress, Playwright)
• Experience with AI APIs (Open
  AI, Claude, etc. )
• Knowledge of RAG, Lang
  Chain, MCP servers/clients, or prompt engineering