Fullstack Developer

Yopeso has been developing a diverse range of software products, from large-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 high-quality, high-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 (MongoDB, PostgreSQL)
• Implement real-time features (WebSockets)
• 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 (TypeScript)
• Vite
• TailwindCSS
• React Query, React Router
  
  
  

Backend

• Node.js & Express
• MongoDB (Mongoose)
• PostgreSQL
• Redis
• REST APIs, authentication (JWT / sessions)
  
  
  

AI & Integrations

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

DevOps

• Docker & Docker Compose
• Environment and configuration management
  
  
  

Required Experience:

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

Soft Skills:

• Strong problem-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 real-time applications (WebSockets)
• Kubernetes experience
• Testing tools (Jest, Cypress, Playwright)
• Experience with AI APIs (OpenAI, Claude, etc.)
• Knowledge of RAG, LangChain, MCP servers/clients, or prompt engineering