< software in production />
Case studies
Every case study here is a system running in production, shown with a real screenshot and told the way it happened: the client's context, the problem they brought, what VTA built and with which stack. The interfaces are in Portuguese because the clients are Brazilian; the engineering is the same we ship to clients in the US, Canada and the UK.
Where a client has not authorized a number (revenue, users, hours saved), the number is not on the page. We would rather publish a case study without metrics than one with invented ones. What you will find instead is what the client asked for, what we built and the stack we picked, block by block.
If your project looks like one of these, each page ends with the matching service and a WhatsApp button with the message already written. Same day reply, fixed quote within 24 hours. If you would rather write first, the contact page has a short form.
The same four projects are listed on VTA's Clutch profile.
Management system
Construtora WR Felix
Construction ERP: projects, quotes read by AI, finance and website leads in a single panel.
- Next.js
- Supabase
- AI Gateway
- GA4
AI SaaS
Tikfy
SaaS for TikTok Shop affiliates: viral product mining, AI image and video generation and an in-browser editor.
- Next.js
- Supabase
- Runware
- Google GenAI
Custom system
VendaMeuCarro
B2B platform for dealer to dealer vehicle transfers, with offers and negotiations in real time.
- Next.js
- Supabase Realtime
- Resend
Payment gateway
Vennox Pay
A full payment gateway: Pix, seller KYC, payouts, checkout and an API with webhooks.
- Encore.ts
- Neon Postgres
- Next.js
- Fly.io
Questions about the case studies
Why are there no result numbers?
Client numbers only go public with written permission, and we do not have it yet for these four. When we do, a results section goes on the page.
Are the screenshots real?
Yes. They were captured from the production dashboards in August 2026. The WR Felix one has the financial figures blurred until the client approves the open version.
Can I talk to one of these clients?
It depends on the client. Ask on WhatsApp and we will check with them before sharing any contact.
The next case study could be yours.
Tell us what you need. Within 24 hours you get a written quote with scope, price and delivery date.
Prefer a form? Request a quote here.