Built By Andre

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Welcome. I’m Andre. Let’s bring your idea to life.

I design and build websites and web apps, working with you from the first conversation to the finished product. Whether you’re starting something new or improving what you already have, I’d love to hear what you have in mind.

My gift is making complex software feel simple and intuitive for the people who use it.

Tell me about your projectExplore my work

Good software starts with understanding people.

Before thinking about screens or code, I want to understand what people need to do—and what makes it difficult today. That gives us a clear purpose for what we build.

A closer look at my work.

Here are a few projects I’ve worked on, what I contributed, and the people they were built to serve.

DogVita NYC home page: Caring for your best friend, over a photo of a dog in Central Park

DogVita NYC

In progress

A dog-care business in New York City needed one place for clients to book and pay, for staff to run operations, and for the owner to manage the day. I designed and built it on my own. The client portal is live, the marketing site is behind an under-construction notice, and the mobile app is in store prep.

My role
Solo designer and full-stack developer
For
Independent client work
Stack
Next.js, React, TypeScript, Tailwind, .NET, Azure, Expo, Stripe, SendGrid, MCP
Owned
Website and client portal; Staff admin; Mobile app; AI owner assistant; API and cloud
Live site
dogvita.nyc
Credit
Designed and built by Andre Castro for DogVita NYC as independent client work.

Read the DogVita NYC case studyVisit dogvita.nyc

NJ Legal Ads

Live

New Jersey public entities needed a way to publish legal notices online. At AlphaDog Solutions, I handled the full-stack development: the public site, the municipal admin, and the systems behind them.

My role
Full-stack development
For
Built at AlphaDog Solutions
Stack
SaaS, Admin UI, Public site
Owned
Public notice site; Municipal admin; Application and data
Credit
Developed by Andre Castro as part of his role at AlphaDog Solutions.
Read the NJ Legal Ads case studyVisit njlegalads.com

DI Trucking

Live

A trucking and hauling company needed a site for its services, a way to estimate a job, and a place for customers to sign in. I designed and developed the marketing site, estimating calculator, and customer area, and I continue to improve the platform.

My role
Product design and development
For
Independent client work
Stack
Web app, Customer portal, Calculator
Owned
Marketing site; Estimating calculator; Customer area
Credit
Designed and developed by Andre Castro for DI Trucking as independent client work.
Read the DI Trucking case studyVisit ditrucking.com
Bergen County Clerk

A new public website for the Bergen County Clerk’s Office. At AlphaDog Solutions, my part was the custom CMS migration. The site is in staging and has no public link yet.

In staging
CityZen

Municipal web work at AlphaDog Solutions. I contribute product design and development. It is in progress and has no verified public destination.

In progress
PDF-to-accessible-HTML platform

Public documents like budgets, audits, agendas, and flyers usually go out as PDFs, which many residents with screen readers can't use. This platform turns them into clean, accessible web pages. Staff upload a PDF, the app reads its layout and tables, and AI agents draft the HTML. People then check it at clear review steps: alt text, reading order, and a screen-reader pass. Staff compare the result side by side with the original before anything is published. The web page becomes the main version, and the PDF stays available as a download.

In progress

View all work

What can we build together?

You work directly with me.

I connect the design with the development, so the way a product looks and the way it works are considered together. AI agents help with drafts and repetitive build tasks. I guide the work, review the details, and take responsibility for what I deliver.

  1. Understand

    Clarify the people, problem, and constraints.

  2. Build

    Turn the agreed scope into a working experience.

  3. Refine

    Review the details and prepare the agreed delivery.

See how I work

Andre Castro in a gray sweater with a city skyline behind him

A little about the person behind the work.

I’m a Brazilian designer and full-stack developer based in New Jersey. My experience spans municipal systems, mobile interfaces, and government web projects. Built By Andre is the home for my independent client work and products, alongside my full-time role at AlphaDog Solutions.

More about Andre

Tell me what you have in mind.

You don’t need to have every detail figured out. Tell me what you want to build or improve, who it’s for, and the timing you have in mind. We can start by seeing whether the project is a good fit.

Tell me about your project[email protected]