Full-Stack Javascript Engineer

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.
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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.
We are seeking an experienced Full Stack Developer to join our team working on an open-source AI chat platform. The successful candidate will contribute to developing and maintaining a sophisticated conversational AI application that integrates multiple AI providers and offers a rich user experience, while collaborating closely with product and design stakeholders.
Key Responsibilities:
Develop and maintain both frontend and backend components of the AI chat platform
Implement new AI provider integrations and chat functionalities
Work with modern React-based frontend and Node.Js/Express backend architecture
Collaborate on database design and optimization using MongoDB
Implement and maintain real-time features using WebSocket connections
Write comprehensive tests and ensure code quality through automated testing
Deploy and maintain containerized applications using Docker
Participate in code reviews and maintain high development standards
Required Technical Skills:
Frontend Development:
React.Js
(v18+) with modern hooks and functional components
TypeScript
for type-safe development
Vite
for build tooling and development server
TailwindCSS
for styling and responsive design
Radix UI
and
Headless UI
for accessible component libraries
Tanstack Query
(React Query) for data fetching and state management
React Router
for client-side routing
State management with modern React patterns
Backend Development:
Node.Js
(v18+) with Express.Js framework
MongoDB
with
Mongoose
ODM for database operations
PostgreSQL
structured data storage
Redis
for caching and session management
RESTful API design and implementation
JWT and session-based authentication
DevOps & Infrastructure:
Docker
and
Docker Compose
for containerization
MongoDB
database administration
Environment configuration and secrets management
Development Tools:
Git
with advanced workflows (rebasing, merging, conflict resolution)
ESLint
and
Prettier
for code quality
Work Arrangement:
Availability to work on-site from our Madrid office a few days per week, with the rest of the time remote.
Required Experience:
3+ years
of full-stack JavaScript/TypeScript development
2+ years
of React.Js development with modern patterns
2+ years
of Node. xhfqzwm js and Express.Js backend development
1+ years
of MongoDB database experience
Proven track record with Docker and containerized applications
Soft Skills:
Strong problem-solving and debugging abilities
Excellent communication and collaboration skills
Ability to work independently and manage complex projects
Attention to detail and commitment to code quality
Adaptability to rapidly evolving AI technologies
Nice to Have:
Experience working closely with Product Managers or in product-driven environments
Ability to contribute to product decisions, user experience improvements, and feature prioritization
Understanding of product lifecycle, user needs, and data-driven decision making
Experience with real-time applications and WebSocket implementation
Experience with Kubernetes and advanced container orchestration
Experience with performance monitoring and observability tools
Familiarity with progressive web app (PWA) development
npm
workspaces for monorepo management
Bun
runtime familiarity
Jest
and
Cypress or Playwright
for testing (unit, integration, e2e)
AI & Integration:
Experience with
OpenAI API ,
Anthropic Claude, or similar LLM APIs
Understanding of prompt engineering and AI model integration
LangChain
framework for AI application development
RAG (Retrieval-Augmented Generation) implementation experience
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