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# Senior Node.js Backend Engineer - AI & Context Engineering

- **Company:** Sinda Hub
- **Location:** Barcelona, Spain (Remote available)
- **Salary:** €70,000 - €80,000
- **Contract:** Permanent contract
- **Skills:** Artificial Intelligence, Amazon Web Services, Software Applications, Microsoft Azure, Software as a Service, Cloud Computing, Relational Databases, Distributed Systems, PostgreSQL, Node.Js, Performance Tuning, Software Architecture, Software Engineering, Software Systems, Systems Integration, TypeScript, AI Infrastructure, Large Language Models, Prompt Engineering, Generative AI, Backend, Agentic-AI, Containerization, Kubernetes, Machine Learning Operations, Restful APIs, Terraform, Data Pipelines, Docker
- **Published:** October 26, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=143eb729f89587c3

## About the Role

* At least 5 years of professional software engineering experience, with a strong focus on backend development.
 * Advanced hands-on experience with Node.js and TypeScript.
 * Strong understanding of backend architecture, REST APIs, and distributed systems.
 * Experience working with cloud platforms such as AWS or Azure.
 * Practical experience with Docker and containerized applications.
 * Solid knowledge of relational databases, particularly PostgreSQL.
 * Experience building scalable, production-ready software systems.
 * Strong problem-solving skills, technical ownership, and the ability to work independently.
 * Availability to work from the Barcelona office four days per week.

Highly Valued Experience

 * Retrieval-Augmented Generation (RAG).
 * Context Engineering and Agentic Memory architectures.
 * Large Language Models (LLMs) and AI-powered applications.
 * AI agents and agentic workflows.
 * Kubernetes, Terraform, or other infrastructure-as-code technologies.
 * MLOps and production AI infrastructure.
 * Experience in fast-growing technology startups or SaaS companies., If you are a Senior Backend Engineer passionate about building scalable systems and interested in working at the intersection of backend engineering and artificial intelligence, we would love to hear from you.

## Description

* Design, develop, and maintain scalable backend services using Node.js and TypeScript.
 * Build and optimize robust REST APIs and distributed backend architectures.
 * Develop backend infrastructure supporting AI-powered applications and intelligent automation workflows.
 * Contribute to Retrieval-Augmented Generation (RAG), Context Engineering, and Agentic Memory systems.
 * Design and maintain reliable data pipelines, integrations, and backend services.
 * Work with cloud infrastructure, primarily AWS or Azure, and containerized environments using Docker.
 * Optimize system performance, scalability, reliability, and security.
 * Collaborate closely with AI engineers, product teams, and founders to deliver high-impact technical solutions.
 * Participate in architectural decisions and contribute to engineering best practices.