Mycarro
Startuplive
What we build
We start from foundations already running in production, so your budget goes into what is actually yours — not into plumbing you would be paying us to rebuild.
Data layer through to interface: search, integrations, background jobs, and the infrastructure to keep it running.
React · Postgres · Kubernetes
The internal tool your industry actually needs — leads, deals, inventory, invoicing, permissions, an audit trail. Built around how you work rather than around a template.
Postgres · Role-based access · Audit logs
iOS and Android from one codebase, sharing types with your backend so the two cannot drift apart. Through the stores, or over the air.
React Native · Expo · TypeScript
Fast, prerendered sites that load instantly and cost almost nothing to run. Content you can edit yourself, in as many languages as you need.
TanStack Start · Tailwind · Cloudflare
Our work
Products we own, work we did for clients, and the tools we publish. Each one says which it is.
A used-car marketplace live in Portugal. Consumer search over listings gathered from across the market, a dealer back office for leads, inventory and invoicing, and a mobile app — built end to end.
we built
A multiplatform MVP for a regulated financial services platform, designed and built end to end: a contract-first backend, an operations dashboard, and iOS and Android apps generated from the same contract.
client · NDA
An open standard for exchanging FAIR data, compatible with DataCite and JSON Schema, with Python, TypeScript and Rust implementations, an MCP server and a desktop app.
we author
The site you are reading. Prerendered in six languages with translated URLs, served as static files from the edge, and built on the same stack we sell.
we built
How we work
Most software projects go wrong in the same three places: nobody agreed what finished meant, nothing was visible until the end, and the client could not run the result without the people who built it.
We agree what finished looks like before the first commit. If we cannot estimate something confidently, we say so rather than padding the number.
Something you can open and click, every week. No long silence ending in a demo that turns out to be the wrong thing.
Your repository, your accounts, your infrastructure, from the first day. Handed over with documentation and tests — not rented back to you.
The difference
We are the people writing the code, not a layer in front of them. Here is what that actually changes.
How to start
You will know what it costs and how long it takes before you commit to anything. The scoping call is free and there is no obligation after it.
A few sentences is enough: what you want built, roughly when, and what it has to do.
Free, about an hour. We work out what is tractable, what is not, and what the hard parts really are.
A written scope with a fixed price and a delivery date. If something cannot be estimated confidently, we say so instead of guessing.
Weekly increments in your own repository, then documentation, tests and a handover to whoever maintains it next.
The principle
Software you cannot run without us is not finished. Everything we build ends up in your repository, on your accounts.
— How we decide what finished means
Writing
· news
Htmlpress is an HTML-first static site generator for humans and agents, available for Python, TypeScript and Rust: HTML or Markdown pages become one site.
· news
Fairspec is an open standard for FAIR data exchange, built on DataCite and JSON Schema, with Python, TypeScript and Rust tools, an MCP server and a desktop app.
· news
Introducing Extension DP (Data Package Extension Template), a GitHub repository template for rapid Data Package extension development.
Get in touch
We are a small team in Portugal, working London hours. A site, an app, an internal tool, or the platform behind them — start with a sentence about the problem and we will take it from there.
