**We are looking for: Senior Full Stack Engineer (React/Next.js/Node.js)** **Mandatory Requirements:** * 5+ years of professional experience building applications with React, TypeScript, and Node.js; 2+ years with Next.js. * Demonstrable experience with Apigee Developer Portal and generating SDKs/clients from OpenAPI 3.1. * Solid practice in contract testing and sandbox management for APIs (test case design, automation, and reporting). * Experience integrating technical documentation with LLMs and ChatOps assistants to support developers. * Knowledge of engineering best practices (CI/CD, testing, code quality, basic API security). * English and Spanish: advanced level (a test will be administered). * University degree in Systems Engineering, Computer Science, or equivalent experience. **Desirable:** * Experience with semantic search, vector stores, and conversational flows (e.g., RAG, embeddings) to support developers. * Familiarity with Camunda or Apache Camel for orchestrating developer tooling workflows. * Knowledge of tools such as Redoc/Redocly/Stoplight, Pact/Dredd, LangChain/LlamaIndex, and stores like Elasticsearch/Pinecone/Weaviate. * Experience with OAuth2/OIDC, API gateways, and API governance practices. * Participation in technical communities, mentoring, and/or open-source contributions. **Position Details:** * **Work Mode:** Remote * **Location:** Madrid