Hire the Best Express Js Developers
in Argentina

I am a backend developer with over 2 years of experience building modern web applications. I specialize in Node.js, NestJS, and TypeScript, with strong experience in relational and non-relational databases (PostgreSQL, MongoDB), creating scalable, maintainable, and production-ready solutions. I also work comfortably with React and Next.js on the frontend when a project requires full-stack delivery. Whether you need a SaaS application, dashboard, internal tool, AI integration, or custom web platform, I can help transform your ideas into reliable software. I build complete web applications including: • Modern frontend development with React and Next.js • Backend APIs using Node.js and TypeScript • Authentication (JWT, OAuth) • Database design with PostgreSQL • REST API development and third-party integrations • Responsive and user-friendly interfaces • Performance optimization and scalable architectures Technical Skills Frontend • React • Next.js • TypeScript • Tailwind CSS • HTML5 / CSS3 / JavaScript Backend • Node.js • Express • PostgreSQL • Redis • REST APIs • Authentication Integrations • Stripe • OpenAI API • Email services • Webhooks • Third-party APIs What You Can Expect ✓ Clean and maintainable code ✓ Clear communication throughout the project ✓ Scalable and production-ready solutions ✓ Attention to performance and user experience ✓ Reliable delivery focused on your business goals I'm always interested in building products that solve real problems and create value for users.

🚀 Fullstack Web Developer | React, Node.js & Scalable Web Apps Hi! I'm Angel, a highly skilled Fullstack Developer and AI Engineer with 4+ years of experience helping startups and businesses build modern, scalable, and high-performance web applications. I specialize in: ✅ Custom web development using React, Next.js, and Node.js. ✅ Optimizing website performance for fast and seamless user experiences. ✅ Building secure and scalable backend architectures with Nest.js, PostgreSQL, and MongoDB. ✅ API integrations, cloud deployments, and DevOps solutions with AWS, Firebase, and Vercel. ✅ AI integreations, AI driven development, Skills, MCPS, Prompt best practices. 💡 Why hire me? I provide clean, maintainable, and well-documented code. I meet deadlines and communicate effectively, ensuring smooth collaboration. I’ve worked on startups, enterprise solutions, and no-code platforms, so I adapt to any project. I don’t just write code—I help businesses solve problems and improve their digital presence. 🛠 Tech Stack: 🚀 Frontend: React, Next.js, Redux Toolkit, Styled Components, SCSS, WebSockets. 🖥️ Backend: Node.js, Express, Nest.js, JWT, PostgreSQL, MongoDB, AWS Lambda. 🔧 DevOps & Tools: Git, GitHub, GitLab, Slack, Trello, Notion, Firebase, Vercel, Nginx. 🤖 AI: OpenAI, Codex, Copilot, MCPs, Custom Skills, Integrations, Embeddings, RAG 📌 Let’s build something amazing together! Contact me and let’s discuss your project.

Hi! I'm Adriel Machado, a fullstack web developer with over 3 years of experience I’ve worked as a freelancer and also developed the entire frontend for an official website for the Government of Entre Ríos (Argentina) I specialize in Frontend: React y Tailwind CSS Backend: Node.js, Express, NestJS Databases: PostgreSQL, MongoDB Other tools: Prisma, Docker, Git, GitHub I have hands-on experience building full e-commerce platforms and complete web applications I’m ready to help you build your next great project!

Hi, I'm Jonathan — a Full Stack Developer specialized in building SaaS platforms, dashboards, and scalable web applications using React, Next.js, Node.js, and PostgreSQL. I develop both frontend interfaces and backend services, focusing on clean architecture, maintainable code, and systems that perform reliably in production. My experience includes: • Full Stack SaaS platforms • dashboards and analytics systems • REST APIs and backend services • database architecture with PostgreSQL and Prisma • third-party integrations (Stripe, external APIs) • modern frontend development with React and Next.js I enjoy solving complex problems and building products that deliver real value to businesses and users. Before becoming a developer, I spent 12 years working in industrial automation and maintenance at Toyota Argentina, which shaped my analytical mindset and systematic approach to problem solving. If you're looking for a developer who can take ownership of features and deliver reliable solutions, I’d be happy to collaborate.

I'm a Full-Stack Developer with 4+ years of experience building web applications, SaaS platforms, internal tools, dashboards, APIs, and automation systems for startups and businesses. I work across both frontend and backend development, so I can help build a complete product, add new features to an existing application, fix bugs, improve performance, or integrate third-party services. I can help with: • Full-stack web application development • Next.js and React applications • Backend development with Node.js and Python • REST API development and integrations • Supabase and PostgreSQL databases • Authentication, user roles, and permissions • SaaS products and MVPs • Admin panels, dashboards, and internal tools • AI features and automations • Payment and subscription integrations • Bug fixing, maintenance, and performance improvements • Deployment and production setup I'm comfortable joining existing projects, understanding unfamiliar codebases, identifying what needs to be fixed, and delivering practical solutions without overcomplicating the system. I can also take a project from an initial idea or design to a complete, production-ready application.

I help companies migrate their Bubble applications to scalable, code-based architectures on AWS — progressively, without downtime, and without rebuilding from scratch. I'm a software developer with 5 years of experience across Bubble and traditional code (Node.js, React, Python). Right now I work daily on exactly this problem, in two production environments: 🏭 VEXTA — an industrial AI platform for critical assets in Oil & Gas. I build and maintain a hybrid Bubble + code architecture: Bubble frontend connected to multiple external backends, heavy third-party integrations, and enterprise SSO (Login with Microsoft / Azure AD). This is the hybrid model I recommend to most clients as the first migration step — and I run it in production every day. ⚡ Enexus (Panama) — as part-time Technical Lead, I drive architecture decisions and the progressive migration of a production Bubble app to microservices on AWS. Selected results: ✅ Cut critical dashboard load times from 20s to 5s (75% faster) through stress testing and optimization ✅ Designed and built a custom backup & data distribution service outside Bubble — moving critical data functionality to independent infrastructure ✅ Led penetration testing and security hardening of the production app ✅ Trained the internal dev team in AI-assisted development workflows Why this matters to you: Bubble is excellent for launching fast, but as your product grows you hit its limits — performance, rising costs, scalability, vendor lock-in. Because I work on both sides every day, I know how to plan migrations that keep your business running while your stack evolves: one service at a time, with your app fully functional until each piece is safely replaced. 🔁 What I can do for you ✅ Migration audit & roadmap: an honest assessment of what to migrate, in what order — and what should stay in Bubble ✅ Hybrid architectures: Bubble frontend + code backend (the proven first step — I run one in production) ✅ Progressive migrations: rebuilding Bubble workflows as services and APIs while your app keeps running ✅ AWS infrastructure: Lambda, ECS, S3, RDS, API Gateway, CloudFront ✅ Database migration from Bubble to PostgreSQL / MongoDB ✅ Enterprise integrations: Microsoft/Azure AD SSO, Stripe, WhatsApp, CRMs, custom APIs ✅ Performance, security & scalability work on existing Bubble apps (you don't need to migrate to work with me) Also experienced with: MERN stack, Python, AI integrations (OpenAI, Claude, RAG systems), and automation with n8n & webhooks. 🛡️ How I work Migrations fail from poor process, not poor code. Every project with me includes: a staging environment for testing before anything touches production, a rollback plan for each migrated component, weekly progress updates with working demos, and full documentation and handover — your team owns everything I build. Availability: 15-20 hours per week — ideal for migration roadmaps, progressive migrations, and ongoing optimization of production apps. If your Bubble app is hitting its limits — slow pages, rising costs, features you can't build, enterprise clients asking for SSO — send me a message. I'll tell you honestly whether migration makes sense for your case, and give you a clear plan if it does.