Web systems, apps and AI automations for small and mid-sized businesses. Plaxo understands the problem, shows you the solution before you pay for it and delivers working software, backed by five products of its own already live.
These are real companies. Real revenue. Teams that work hard. But they run on patched-up technology right where it hurts the most.
When the owner decides to change, nobody explains the path clearly. Agencies ask for a technical brief. Freelancers disappear. Big firms charge like NASA.
Converts WhatsApp chats and web page captures into draft notarial minutes, with chain of custody, audio transcription and DOCX files in the notary office's own template.
NestJS · React · Tailwind · Docker
Automated FAQ that replies instantly, 24/7, in your brand's voice. Plugs into your website with a few lines of code.
Next.js · NestJS · Docker
Voice profile analysis with transcription, PDF reports and step-by-step exercises for different fields.
Flutter · Python · NestJS · Whisper · Redis
A dashboard that processes large volumes of public data and shows the current debt calculation.
ClickHouse · NestJS · Redis
Short micro-lessons to learn about software development in the gaps of your day.
Two free conversations to understand the problem, the current process and what already exists. Only then comes a proposal with price and timeline.
FreeScreen prototypes, feature scope and technical architecture. You see how it will work before approving development.
30% of the projectBuilt in stages, each one published to a test environment you can access and use.
Test environmentReleased to production with code, documentation and server access. Each stage is paid only after you approve it.
Pay on approvalThe 30% for visual validation isn't a trap. It protects both sides. In return, you get all the technical documentation, architecture and specifications.
Material that's yours. That has value. That any other vendor can use.
A company that trusts its own work doesn't lock clients in with fine print.
Built from scratch: web, mobile app, integrations or AI. No competitor will have the same system. Ideal when your problem is truly unique.
A product already running in production, such as FaqAI or AtaZap, adapted to how your business works. Lower cost, faster delivery.
Carlos Batista
Full-stack developer based in Alfenas, Brazil. Covers the whole product cycle: mobile app, backend, frontend, deployment and the server it all runs on.
Degree in Computing Education from IFSULDEMINAS and a postgraduate student in Solutions Architecture. Before building software full time, he taught computing to more than 200 students, which is why he explains technology without jargon.
React · Next.js · Flutter · NestJS · Laravel · Go · Docker · AWS · LLMs
A NestJS reporting system built on streams: memory usage stays flat whether the batch is tiny or huge.
GraphQL, FTP, CSV and JSONL coming in through different paths and leaving in the same format, with no duplicated business rules.
A warm instance pool on AWS Lambda with Go workers, removing the wait on subsequent calls.
Models connected to the client's own data (RAG and agents), including running locally so no data leaves the building.
The owner who knows there's a problem but doesn't know what to build.
Anyone who has tried off-the-shelf software and none of it fit.
Anyone afraid of investing and getting nothing in return.
Anyone who wants to grow with technology without becoming an IT manager.
Web systems, Android and iOS apps, integrations between systems that don't talk to each other (spreadsheets, ERPs, old APIs) and AI automations connected to your business data.
Carlos Batista, a full-stack developer based in Alfenas, Brazil. The same person talks to you, designs the solution and writes the code. Nothing is outsourced.
No. Most people arrive with a problem. The first conversations are for defining together what needs to exist.
It depends on the scope. An adapted product costs less. Either way, you know the price before anything starts.
An adapted product can be running in weeks. An exclusive build depends on complexity, with the roadmap agreed up front.
You keep all the documentation produced: architecture, specs, scope. Material another vendor can pick up.
Not at all. No pitch, no unsolicited proposal. Just listening and diagnosis.
No commitment. No technical proposal. Just listening. Reply within 2 business days.