captureapplication.fairspec.org
Fairspec — data framework in TypeScript and Python
A specification for describing tabular datasets, with reference implementations in TypeScript and Python.
we author
Beyond the build
Data platforms & pipelines
Getting data in, checking it, and keeping it correct — from a handful of spreadsheets to millions of rows a day.
starts fromdatist · pricing
€5,000
fixed price from
2 weeks
delivery from
Both agreed in writing before anyone starts
What it is
Everything between data arriving and data you can trust: collecting it, giving it a shape, checking it against that shape, and keeping it correct as it changes — whether it comes from a handful of spreadsheets or a few million rows a day.
What you get
Pipelines that fail loudly instead of quietly writing something wrong. A written schema your data is checked against on every run, so a bad file is caught at the door rather than by the person who consumes it a month later. And formats that outlive us — open, documented, and readable without our software.
How we build it
Columnar processing, so the cost of a million rows is closer to the cost of a thousand than you would expect, and a schema that travels with the data rather than living in a document beside it. This is our oldest line of work: we author the Fairspec exchange format, we wrote the TypeScript implementation of the Data Package standard under an NLnet grant, and the Python framework behind it is downloaded around 700,000 times a month.
Where we have built it
capturemycarro.app
Mycarro — car marketplace and dealer CRM
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
What we build it on
Columnar dataframes instead of ad-hoc scripts, so a million rows costs what a thousand does.
Schemas that travel with the data, and one validation contract from database to browser.
One Postgres per product, with the schema and the queries deliberately owned by different tools.
Polite, resumable crawls that fail loudly instead of quietly going empty.
Get in touch
Tell us what you need built.
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.