A one person lab, with uptime.

_{The counters are read live from selflabs.org/stats.json, regenerated from the GitHub API every Monday, private repositories included.}

I build firmware for Bitcoin hardware wallets, management systems for the Brazilian public sector, home automation on boards I flash myself, and infrastructure that runs on hardware I own. All of it under Self-Labs, which is a laboratory, not a company: the "self" is literal. Self-hosted, self-custody, done by hand.

No managed database without a reason. No deploy that depends on someone logging into a server. No private key inside a machine that talks to the internet.

When something broke in production, it is written in the repository that it broke, with a date and a file reference. That is traceability, not modesty.

System	What it solves	Notable detail
Wallet Store	Sells hand assembled DIY hardware wallets, no account, Pix or Bitcoin	Watch only xpub, every address derived locally. Refuses to boot if the configured keys derive an unexpected address. Buyer data erased 72h after delivery.
ALFERES	Personnel, leave, headcount and health for the Military Police of Espírito Santo	Live at a unit of around 500 officers, about 20 concurrent users at peak. The unit registry already covers the whole state.
Jade DIY	Turns off the shelf ESP32 boards into a working Blockstream Jade	Secure Boot signed firmware, a browser flasher, battery and touch logic for four different boards
Radar de Promo	Deal hunting with nobody in the loop	Rewrites each deal with an LLM, swaps in the affiliate link and posts to WhatsApp groups and a Telegram channel. When a group fills up, the next one is created and the invite already out points there
Tasmota IR	Learn and send IR from Home Assistant through any Tasmota board	Climate, media player, fan, light and cover entities built from learned keys. The emitter belongs to the appliance, set once, never typed per call
Tasmota for KinCony	Browser flasher for Tasmota builds that actually fit KinCony boards	The official binaries either lose the W5500 Ethernet or leave the 16 relays unreachable. Plug in by USB-C and click Install, no Python, no esptool
cups	An old USB printer turned into an AirPrint network printer	Multi arch image rebuilt every Sunday, published only when a package actually moved.
selflabs.org	The lab's landing page	Astro, bilingual, Cloudflare Workers. Numbers on it come from the GitHub API, never typed by hand

Also public and maintained: ha-custom-branding (white label Home Assistant: tab, login screen, loading logo and PWA icon, surviving every image update), ai-usagebar-win (Claude and Codex quotas in the Windows tray, one .exe, no Rust toolchain), stirling-pdf (a weekly MIT build of Stirling-PDF without the 5 user cap) and DIY (27 Portuguese guides on self-hosting and home automation, each with the Portainer stack ready to paste).

Twenty pull requests accepted in nine repositories owned by eight different people, plus write access to somebody else's project.

Under review right now: Tasmota IR into the HACS default store (hacs/default#11235), the large link preview card in evolution-go#207 (the WhatsApp API behind Radar de Promo), two more Electrolux fixes (#222, #224) and the HACS one click install for the Intelbras alarm integration (#7, #8).

Recurring theme: I run Windows and ARM64, which is exactly where most projects quietly break.

_{Five of the six Jade pull requests show as closed rather than merged because the maintainers land the changes through their own branch. The commits are in the official master and in the shipped firmware.}

push to master
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  CI: tests, typecheck, image build on a NATIVE arm64 runner (never QEMU)
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  webhook -> Portainer stack pulls the repo
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  Orange Pi 5 / Ampere VPS

No manual step, no SSH at two in the morning, same path in every project. The deploy job fails loud on any HTTP status outside 2xx, so a broken redeploy never looks like a green build.

• Ethernet that only came up with a USB cable plugged in. On a KinCony AG8 the W5500 was detected, ETH_START fired, and the link never followed. Cause: with no USB host at boot, Tasmota falls back to a console on UART0, and on the ESP32-S3 that is GPIO43 and GPIO44, exactly the board's SPI MOSI and MISO. Fixed upstream by releasing the console instead of the pins (arendst/Tasmota#25047).
• The dev server died on every Vite re optimisation. EPERM ... rmdir node_modules\.vite\deps, then a libuv assertion. Cause: 345 of 345 directories in the checkout carried the Windows ReadOnly attribute, and Node's rmdir returns EPERM on those. Documented in self-labs/self-labs CLAUDE.md.
• An animated trace where the dot vanished at 79% of the band. The trace scrolled and the head ran, so what you saw was the difference between two speeds, and that difference is always a whole multiple of 120 units while a browser window is any width at all. Fixed by removing the shape, not by patching the symptom.

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