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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Full-Stack Developer - **Company:** Número De - **Location:** Spain - **Contract:** Permanent contract - **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Amazon S3, User Authentication, Mobile Application Development, Databases, Relational Databases, PostgreSQL, Node.Js, Object-Relational Mapping, OAuth, PostGIS, Software Architecture, Role-Based Access Control, OpenAI, Search Technologies, Shopify, Software Engineering, Twilio, TypeScript, Openapi, Pinecone, Klaviyo Email and SMS Marketing, Qdrant, Freeform SQL, ReactJS, Retrieval-Augmented Generation, Large Language Models, Backend, Pgvector, AWS Fargate, React Native, Gsuite, Front End Software Development, Claude, Functional Programming, NestJS, Restful APIs, Amazon Simple Queue Service (SQS), Multiplatform, Webhooks - **Published:** October 1, 2026 - **Apply:** https://www.adzuna.es/details/5903928858 ## About the Role * 5+ years of professional software engineering experience with TypeScript end-to-end across backend and frontend environments. * Backend Mastery: Strong production experience with NestJS (Modules, Guards, Interceptors, Pipes) and Node.js. * Frontend Mastery: Deep experience with ReactJS (hooks, state management, modern UI patterns) and React Native (iOS & Android). * PostgreSQL Expertise: Proven experience with relational database design, complex SQL queries, migrations, and ORMs (Prisma or TypeORM). * Advanced AI Usage & Vector Search: Proven experience working with LLM APIs / Providers (AWS Bedrock, OpenAI, Anthropic Claude), vector search databases (pgvector, Pinecone, or Qdrant), and RAG architecture. * AWS & Infrastructure: Hands-on experience with managed AWS services (ECS Fargate, S3, Cognito, EventBridge, SQS, KMS, Secrets Manager). * State & Data Fetching: Proficiency with asynchronous data fetching libraries (e.g., TanStack Query / React Query), REST APIs, and typed API client generation. * Authentication & RBAC: Experience implementing multi-tenant auth workflows (OAuth2, JWTs, SSO federation) and strict permission matrices., * 5+ years of professional software engineering experience with TypeScript end-to-end across backend and frontend environments. * Backend Mastery: Strong production experience with NestJS (Modules, Guards, Interceptors, Pipes) and Node.js. * Frontend Mastery: Deep experience with ReactJS (hooks, state management, modern UI patterns) and React Native (iOS & Android). * PostgreSQL Expertise: Proven experience with relational database design, complex SQL queries, migrations, and ORMs (Prisma or TypeORM). ## Description * End-to-End Feature Development: Design, build, and deploy full-stack capabilities across the NestJS API backend and modern React/React Native frontend surfaces. * Backend Architecture & Domain Logic: Develop modular NestJS domain services, RESTful APIs, OpenAPI specs, and resilient third-party integrations (Twilio, Klaviyo, Google Places/Maps, Attio CRM, Shopify). * Frontend Application Engineering: Build complex, high-density administrative interfaces in ReactJS (pnpm/Nx workspace, TanStack Query, typed contracts) and cross-platform mobile app components in React Native. * Database & Search: Implement relational schemas and query optimizations in Aurora PostgreSQL (TypeORM/Prisma), including spatial proximity search (PostGIS) and vector embedding indexes (pgvector for AI retrieval). * Security & RBAC Implementation: Enforce strict staff and member identity controls (AWS Cognito, Google Workspace SSO), resource/field-level authorization guards, and audit mechanisms for sensitive VIP data (passports, KMS-encrypted payment card boundaries). * Asynchronous Processing: Support event-driven ingestion and notification workflows powered by EventBridge, SQS, Lambda, and Webhooks. ## Related Videos - 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