Tulio N.

👋 Need a Full Stack Developer who ships production-ready products on time — not just prototypes? I'm Túlio, a full stack developer and React / Next.js, Angular developer with real experience building SaaS platforms, MVPs, REST APIs, automation systems, JavaSpring Boot, dashboards, mobile apps, and AI-powered tools. I've co-founded a SaaS company, shipped products at an agrotech startup, worked with a VC fund in Madrid, and delivered government-scale data systems. I write clean, maintainable code and I deliver results you can measure. ⚡ Real results from real projects: → 40% reduction in page load time (LCP) through caching on a production app → 70% decrease in Customer Acquisition Cost through automation workflows → ~90% reduction in missing records via automated ETL pipelines → End-to-end features shipped across backend, frontend, and mobile in fast-paced startup environments 🚀 Services I Build: 🔹 SaaS Platform Development — I build full SaaS products from scratch using Python (Flask / FastAPI) or Node.js / NestJS backend, JavaSpring Boot paired with React, Angluar or Next.js frontend. Multi-tenancy, authentication, subscription logic, admin panels, billing integrations — the full product. 🔹 MVP Development in Short Timelines — Got an idea and need to validate it fast? I build clean, functional MVPs that are production-ready from day one. From zero to live quickly, with architecture that won't need a full rewrite when you scale. 🔹 Custom Web App Development — Web applications for any industry, from internal tools and dashboards to customer-facing platforms. React + Next.js + Angular frontend, Python or Node.js backend, PostgreSQL or Firebase, deployed on AWS. 🔹 Admin Panels & Business Dashboards — Data-rich dashboards with real-time data, charts, user management, and role-based permissions. Built with React / Next.js and connected to your backend or database. 🔹 REST API Development & Integrations — Scalable REST APIs with Python or Node.js / NestJS, integrated with Stripe, Twilio, SendGrid, HubSpot, Google APIs, or any custom webhook. 🔹 Mobile App Development — Cross-platform mobile apps with React Native, sharing logic with your web frontend and keeping your codebase consistent across platforms. 🔹 E-commerce & Marketplace Development — Custom e-commerce platforms with product listings, cart systems, Stripe / PayPal payment integration, order management, and vendor dashboards. 🔹 AI Chatbot Development — Custom AI chatbots powered by OpenAI and Claude APIs for customer support, lead capture, onboarding, and internal knowledge assistants — connected to real databases and business logic. 🔹 RAG Systems & Document Intelligence — RAG (Retrieval-Augmented Generation) systems that let users chat with your own documents, PDFs, SOPs, and knowledge bases using vector search and LLM backends. 🔹 AI Voice Assistant Development — AI voice agents for call automation, lead qualification, and phone-based workflows using Twilio, ElevenLabs, and OpenAI Whisper. 🔹 Business Automation & ETL Pipelines — Intelligent automation with n8n and Python to eliminate manual work, sync databases, automate reporting, and connect tools via APIs. Built ETL pipelines at government scale. 🔹 API Integration & Legacy Modernization — Integrate existing systems with modern APIs, migrate legacy backends, and connect disconnected tools into one coherent product. 🛠️ Core Tech Stack: 🐍 Python — Flask, FastAPI, Django, automation, ETL, pandas, Scikit-learn ⚛️ Frontend — React, Next.js, TypeScript, TanStack Query, HTML5, CSS3, Tailwind CSS 🟢 Node.js — NestJS, Express.js, TypeORM, Prisma, GraphQL 📱 Mobile — React Native (iOS & Android) 🗄️ Databases — PostgreSQL, MySQL, Firebase, Oracle, MongoDB, Redis ☁️ Cloud & DevOps — AWS (RDS, EC2, S3), CI/CD, Git, Docker, Vercel 🤖 AI & LLM — OpenAI, Claude API, n8n, RAG, LangChain, Twilio, ElevenLabs, Whisper 🏢 Industries I've Shipped In: ✅ Agrotech (Tarken) · ✅ SaaS & Digital Marketing (GoodsLeads) · ✅ Government / Tax Authority (SEFAZ, Brazil) · ✅ Venture-Backed Startups (Madrid, Spain) I communicate clearly, show progress regularly, and treat your project like it's my own. Let's build something great. 💬 keywords: python full stack developer · python developer · python fastapi · python flask · python django · python backend developer · python automation · react developer · next.js developer · node.js developer · nestjs developer · typescript developer · javascript developer · full stack developer · full stack engineer · saas developer · mvp developer · web app developer · web developer · backend developer · frontend developer · react native developer · mobile app developer · rest api developer · api integration · dashboard developer · admin panel developer · ecommerce developer · aws developer · etl developer · automation developer · ai developer · ai chatbot developer · rag developer · llm integration · openai developer · voice assistant developer · n8n · postgresql · firebase · ci/cd