DAVID XAVIER / FULL STACK DEVELOPER
Full stack developer in São Paulo building systems and digital experiences with React, Next.js, Node.js, TypeScript, APIs and applied AI.
Explore interfaces, business logic and integrations. Try the demos. Read the code. See how it all comes together.
Appointment scheduling with authentication, role-based access and protection against double bookings.
Demo with fictional services and professionals. The API may take a moment to wake up on your first visit.
An editorial experience with translation, saved articles and server-side integrations with NYT and DeepL.
The demo uses sample news and translations. Live integrations require server-side configuration.
An educational portal for stocks, currencies and crypto, with search, filters, favorites and SEO.
Portfolio project. The converter uses fictional rates, labeled as such in the demo.
Brazilian postal-code lookup and currency conversion with validation, caching and error handling.
Data sources, setup and limitations are documented in the repository.
Forecasts for all 27 Brazilian state capitals, city search and locally saved favorites.
Portfolio project using weather data from Open-Meteo.
I’m David Amorim Xavier, a full stack developer and founder of XD Plans. My career brings together technology, design and problem-solving: from computer maintenance to building complete applications.
Since 2018, I have built websites, online stores, custom systems, APIs and admin dashboards at XD Plans. I work across the entire lifecycle: requirements, interfaces, back end, databases, deployment and ongoing improvements.
I want to bring this experience to new teams and build products people enjoy using. My next chapter combines JavaScript, Node.js, integrations and AI applied to development and automation.
The right tool for each problem. The experience to connect the pieces and build the complete solution.
React.js · Next.js · TypeScript · JavaScript · HTML5 · CSS3 · Tailwind · Framer Motion
↗Node.js · Express · PHP · APIs REST · JWT · Webhooks · System integration
↗MongoDB · Mongoose · MySQL · MariaDB · Prisma · Git · Vercel · Render · Linux
↗WordPress · WooCommerce · Plugins · AI APIs · Process automation · Kotlin
↗I’m interested in projects that connect AI APIs, web systems and process automation. Technology with purpose: fewer steps, connected information and better experiences.
Business websites, e-commerce, web systems, APIs and dashboards. React, Next.js, Node.js, Express, MongoDB and MySQL. WordPress plugins, WooCommerce, infrastructure, client relationships and product improvements.
Contributed to the official website using WordPress, as described in my résumé.
Digital projects using HTML, CSS, JavaScript, PHP and WordPress. Planning, interface development and client relationships.
Taught computer hardware, operating systems, troubleshooting and preventive and corrective maintenance.
Computer maintenance, system installation and configuration, and technical support.
Before XD Plans, there was already a drive to create. Two snapshots of my website in the Internet Archive preserve that story.
High school graduate. Web programming and graphic design courses at SOS Computadores (2009). Continuous learning through projects, integrations and new tools.
XD PLANS / VIRTUAL ASSISTANTA new connection between
people and technology.
I created Ávix, my WhatsApp assistant and chatbot. He is part of the XD Plans universe and my exploration of conversational interfaces and automation.
Curious? Start a conversation on WhatsApp and explore this project firsthand.
Chat with Ávix ↗WHATSAPP / +55 11 92626-5383Building a team or bringing an idea to life?
Let’s create something worth putting into the world.
Chat with ÁvixMY WHATSAPP ASSISTANT ↗