I build the whole thing.

Web products, developer tools and operational apps, from product definition to deployment. Brazilian, based in Canada.

“Who are you?”
Fair question…

Hi
I'm Jonatas. I do the whole path: schema, API, interface, deploy. Then I spend just as long on the type.
How I work
I came to web development late, after fourteen years in IT operations and business systems. I build with AI agents every day, Claude Code most of all. A good share of what I ship starts as generated code that I read, cut down and test before it goes anywhere.
Before you click
Click any card marked live and judge the real thing. The rest tell you where they are.
I promise: the build passes, the contrast clears AA, and nobody needs a tutorial to use it.
Every colour here comes from somewhere. I can name the source of each one.

Things I built

6 live
bastion interface

bastion

On-chain observatory for Robinhood Chain. It counts launches as they happen, and every reading carries the UTC instant it was taken.

18 accent skins, each with an automated contrast test. Next 16 on Cloudflare Workers.
LiveKlein BlueNext 16Workers
lockproof interface

lockproof

A public register of locked liquidity on Robinhood Chain. Paste a token address and it reads the lockers, then says how much of the pool is locked and whether the lock still covers the price.

Every lock has a page of its own to post, and the API returns the same read without a key.
LiveBanknote GreenWorkersPublic API
JSR Games interface

JSR Games

Site for a small indie game studio that ships VR titles to Meta Quest.

I built the site, not the games. Bilingual, with a theme switcher.
LiveRiso VioletNexti18n
$POACHER interface

$POACHER

A token landing page shaped like a desktop. Rummage through the files, then read the system alert before you buy anything.

Canvas desktop you can drag around, served from Cloudflare Pages.
LiveAcid LimePagesCanvas
NEC Calc Pro interface

NEC Calc Pro

Seven electrical calculators covering NEC 2020, 2023 and 2026. It runs offline, and every result names the table it came from.

In closed testing on Google Play, App Store next. $19.99 once, three of the seven free.
LiveBloomberg AmberOfflineNEC 2026
RIMWARD interface

RIMWARD

A browser space western. Run warrants, settle showdowns, and build a crew across five worlds, a season at a time.

Server authoritative: the browser renders, the server decides. The season ships its own updates.
Next weekPulp VermilionReactVite
JP Tecnologias interface

JP Tecnologias

Site for a company that automates fuel pumps and runs the IT behind them. Services, partners, and a channel for remote support.

Built for a client whose customers call from a forecourt, not a desk.
LiveDeep TealNext.jspt-BR

Got something
worth building?

Email reaches me fastest, but LinkedIn works too.