Alejo S.

Backend Engineer | Node.js | AI Automation | N8N | React Native I’m a Backend-focused Software Engineer with 5+ years of experience building scalable APIs, distributed systems, AI-powered solutions, and mobile applications. I specialize in Node.js, TypeScript, PostgreSQL, and cloud-based architectures, helping startups and companies design, build, and scale products from idea to production. My experience includes designing backend architectures, developing microservices, orchestrating business workflows, integrating AI services, and building cross-platform applications with React Native. ⚙️ Backend Engineering & Architecture • Node.js (NestJS, Express) • REST APIs, GraphQL, Webhooks • PostgreSQL, MongoDB, TypeORM • Microservices & event-driven architectures • Authentication & Authorization (JWT, OAuth, Auth0) • Distributed systems and orchestration layers • Database design and optimization 🤖 AI & Automation • OpenAI & Gemini integrations • AI-powered workflows and agents • RAG (Retrieval-Augmented Generation) systems • n8n automations and workflow orchestration • Automated document processing and data extraction • Business process automation and third-party integrations ☁️ Cloud & DevOps • AWS & Azure integrations • Docker & containerized deployments • CI/CD pipelines and GitHub Actions • Monitoring and observability • Production deployments and infrastructure integration 📱 Mobile & Full Stack Development • React Native (Expo) applications • React & Next.js web applications • End-to-end product development • Performance optimization and scalable architectures 🧪 Quality Engineering • Playwright, Jest, Cypress • Automated testing strategies • Code reviews and technical documentation • Clean Architecture and software engineering best practices What I Deliver ✅ Scalable backend systems and APIs ✅ AI-powered automation solutions ✅ Production-ready architectures ✅ Mobile applications with React Native ✅ Clean, maintainable, and well-tested code ✅ Long-term technical partnership and product ownership I enjoy working with startups and product teams that need an engineer capable of designing robust backends, integrating AI, automating workflows, and building products from idea to production. If you're looking for a Backend Engineer who can also contribute across the full stack and mobile ecosystem, let's build something great together.