Custom software development

Code
that builds
businesses.

I turn ideas into websites and systems that actually work, from the first sketch to a live product. Over 10 years of experience, and products of my own running in production today.

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INDEPENDENT DEVELOPER10+ YEARS BUILDING SOFTWARECURITIBA, BR · WORLDWIDE
Work

Ideas brought
to life.

Products, websites and tools I built, for clients and on my own. Click to see how each one came about.

Vinculari home screen, with the day's numbers and the weekly schedule
Vinculari family portal on a phone
Own product · SaaS

Vinculari,
therapeutic care

A vertical SaaS built from scratch for speech therapists. Clinical records, scheduling, session mode, therapeutic games, reports with AI support and a family portal, all in one place.

  • Complete clinical records you can export as PDF
  • Session mode with notes, games and tools on one screen
  • Scheduling with fixed time slots and holiday warnings
  • Clinical reports with AI support, always reviewed by you
  • Family portal and home activities
See how it was built vinculari.com.br ↗
What I do

Services
built around you

For companies and individuals who need technology built with real care, not just shipped on autopilot. I work fully remote, including with international teams.

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01

Custom Web Systems

Complete systems for companies that need more than a website. User accounts, a login area, reports and rules specific to your business, from scratch to production.

I work with simple or more robust architectures, depending on the size and stage of the project. The process covers understanding the problem, structuring the data, building iteratively and shipping to production with automated tests.

I have experience with high availability systems, third party integrations, secure login and complete admin panels.

JavaSpring BootAngularReactTypeScript
02

Websites & Landing Pages

Your professional website, ready to present your business and attract clients. Institutional page, portfolio or campaign landing page, published and optimized so you don't lose a single visit.

Ideal for anyone just starting out or refreshing their online presence without spending more than they need right now. The site comes with responsive design, fast loading and basic optimization to show up on Google.

A campaign landing page focuses on a single goal, like selling a product, promoting an event or capturing contacts. Less distraction, more conversion.

WebsiteLanding pageSEOResponsive
03

Ongoing Maintenance & Support

Once a system goes live, it doesn't stop needing attention. A monthly retainer to monitor it, fix what breaks and evolve things gradually, whether I built it or not.

Platforms update, libraries go stale, integrations change behavior without warning. A system that's live isn't the same as a system that's safe. I monitor it, apply fixes and keep things running, even when the problem has nothing to do with the original code.

I do an initial code review before taking on any system built by someone else, to understand what I'm inheriting. The retainer covers monitoring, fixes and small tweaks; bigger evolutions are scoped as separate projects.

MaintenanceRetainerMonitoringLegacy code
04

AI for Your Business

I use AI to generate automatic reports, analyze data, answer frequent questions and automate repetitive tasks. No exaggeration, only where it makes a real difference.

I identify where AI genuinely helps your everyday work, whether generating documents, organizing information or answering questions based on material your company already has. I integrate everything simply into what you already use.

I work with the main AI tools on the market, picking the option with the best value for each case. Every use case has an agreed outcome before we start, so you know if it's worth it.

AIAutomationChatbotReports
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Who's behind it

Just me,
for real

My name is David Abt, and Abt Tecnologia is me, solo. No partner, no big team, no intern learning on your dime while you foot the bill. You talk to me directly, from the first email to the day the system goes live.

I spent the last 10 years as an engineer at a German tech company, fully remote the whole time. I was part of teams that build and maintain systems used by thousands of people every day, from the systems behind the scenes that keep the operation running to the interface the end user actually sees. That experience taught me to think about scale and maintenance over the long run, not just about shipping something that works on launch day.

Now I'm open to select projects on an independent basis. I'm based in Curitiba, Brazil, and work remotely with clients worldwide. I take on a few at a time, so I can actually pay attention to each one. I always start with the problem, not the technology.

10+
Years of exp.
24h
To reply
100%
Remote
How I work

From the first email
to delivery

A simple, transparent process. You always know where the project stands, from start to finish, with no surprises.

01

Conversation

I get to know the problem before talking tech. What you need to solve, for whom and by when. No strings attached.

02

Scope and proposal

I define what actually makes sense to build, with clear scope, a realistic timeline and a transparent quote. You approve before a single line of code.

03

Development

I build it bit by bit, with partial deliveries so you can follow along. You watch the product grow instead of getting a black box at the end.

04

Delivery and support

I put it live, with documentation and ongoing support. The project doesn't end at launch. I stick around to adjust and evolve it.

Let's work together

Got a project
in mind?

Tell me the details in a quick form. I get back to you within 24 hours.

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