Software Engineer Node.js
Kintary · Madrid, Community of Madrid, Spain
IT Services and IT Consulting · 2-10 employees
About the role
Design, develop, and maintain scalable backend services and REST APIs using Node.js and TypeScript. Integrate AI capabilities and build AI agents using LangChain and LangGraph.
What they look for
Requirements
Requires 5 years of experience with Node.js, TypeScript, and cloud environments like AWS or Azure. Experience with AI model APIs and frameworks such as NestJS or Express is essential.
Benefits
Full description
We are a trusted, specialised consultancy with a mission to bring expert technology leadership to businesses at every stage of their growth journey. Our work spans multiple clients and providers, helping them deliver technology initiatives with precision, strategic alignment, and lasting value.
Operating at the intersection of technical excellence and business strategy, we ensure projects not only launch successfully but also drive broader organisational goals.
As part of our ongoing support for a key client based in Madrid, We are looking for an experienced NodeJS Developer to join the team. You will play a key role in designing and developing scalable backend services, integrating artificial intelligence capabilities into our products.
What you'll do
- Design, develop and maintain robust, scalable REST APIs
- Build and integrate AI agents using LangChain and LangGraph
- Write clean, well-typed, maintainable TypeScript code
- Collaborate with the team on architecture decisions and best practices
- Take part in code reviews and continuous improvement initiatives
What you'll bring
- 5 years of experience with Node.js
- Experience building REST APIs
- Strong command of TypeScript
- Experience with frameworks such as NestJS, Express, Fastify or Koa
- Experience working in cloud environments (AWS, Azure)
- Experience interacting with AI model APIs (OpenAI, Anthropic, etc.)
- Experience building AI agents, ideally with LangChain / LangGraph
Nice to have
- Frontend development experience, ideally with ReactJS, Redux, etc.
What's in it for you
- Flexible compensation plan (transport, childcare, restaurant vouchers, etc.)
- Private healthcare fully covered by the company
- Physiotherapist available at the office
- Hybrid working model: 5 remote working days per month
- Additional remote flexibility during July and August
- Flexible working hours
- Intensive working schedule during July and August (8:00 AM – 3:00 PM)
- 23 vacation days per year and Christmas Eve and New Year’s Eve off when they fall on working days
- Half day off on your birthday
- Personalized training and career development plan
- Modern offices located in the center of Madrid, near Banco de España
