Hi, I'm

Daniel Bernardino de Souza

Labs

Labs is Daniel's showcase and concept lab: a place for concept demos and anything else he wants to share, launched in September 2026 with five live demos in its first month — Bastidores, Conta de tokens, Curtailment BR, Pix na minha cidade and Raio de explosão, each built on public data. The demos were researched, designed and built by an orchestration of AI agents under Daniel's direction — 36 agents across 7 phases, with Daniel deciding at 5 points, as Bastidores replays from the orchestration's own logs.

5 concept demos live within its first month

• Next.js
• React
• TypeScript
• AI agent orchestration
• Railway

Radar Tech Sul SC

Radar Tech Sul SC is a Telegram bot that gathers the tech events of southern Santa Catarina (Criciúma and region), scattered today across Meetup groups, Sympla and institutional agendas, into a single channel. It collects from each Source (Meetup iCal feeds, Sympla's embedded JSON, the SATC events portal) plus links suggested in a private chat, keeps only tech events in the region, normalises title, date, time, venue, organiser, price and sign-up link, merges several announcements of one event into a single post, and routes open Sources through a review queue before publishing — then edits the post when the event changes, sends a reminder the day before and a weekly agenda on Mondays. It began on GitHub Actions and moved to an always-on process on Railway once the up-to-an-hour latency between approval and post proved unacceptable in real use.

• Python
• httpx
• icalendar
• Telegram Bot API
• Railway
• GitHub Actions
• pytest

dont-let-me-forget

dont-let-me-forget is a set of three Claude Code agent skills that turn "I don't want to forget this" into a resurfacing queue. The capture skill saves an idea, a reading or a maybe-project as a Note with the reason it was kept, in a single approval, and hands the session straight back to what was interrupted. Notes come back on a 1d → 3d → 1w → 2w → 4w ladder; at the last rung, the Wall, they can only be acted on or archived. The review skill walks the due Notes one at a time, opening with the real count and naming how many times a Note has already been postponed, and the browse skill lists the queue or draws one Note at random from everything ever saved, archive included. A session-start hook reports how many Notes are due, and nothing is ever deleted by automation.

• Node.js
• Claude Code skills
• hooks
• Git

Café Cajubá — App

Café Cajubá — App is the customer-facing mobile app of the loyalty club of Café Cajubá, a coffee roaster founded over 55 years ago and first in the Top of Mind Uberlândia survey and reported by the Diário de Uberlândia in 2018 to account for up to 80% of coffee-segment sales. Members sign up, submit their purchase receipts, watch them turn into points, and spend those points on rewards, alongside an in-app store, order history and loyalty games; payment goes through Mercado Pago or Stripe and shipping through Melhor Envio, all behind the Café Cajubá REST API. Daniel built the app end to end, delivering 30 screens in roughly ten weeks — including two-step email verification, the Google sign-in path, and a design system of width bands and per-region ceilings that every screen is built against. It authenticates directly against Supabase and consumes the REST API with a bearer token, under an identity rule that keeps admin and customer accounts strictly disjoint on a shared user base. The client approved it; it has not been launched, pending the client's payment.

30 screens delivered in ~10 weeks, approved by the client, not yet launched

• React Native
• Expo
• expo-router
• TypeScript
• Supabase Auth
• Jest
• Zustand
• TanStack Query

Café Cajubá — Painel de Fidelidade

Café Cajubá — Painel de Fidelidade is the admin web panel and REST API behind the loyalty programme of Café Cajubá, a coffee roaster founded over 55 years ago, first in the Top of Mind Uberlândia survey run by the city's commercial association (Aciub), and reported by the Diário de Uberlândia in 2018 to account for up to 80% of coffee-segment sales. The system closes the loop from customer receipt to audited invoice to points to redeemed reward. Daniel built 9 of its 10 modules over roughly ten weeks — Dashboard, Clientes, Produtos, E-commerce, Prêmios, Notificações, Conteúdo, Usuários and Configurações, everything except the invoice-audit module owned by a teammate — alongside the three-tier product catalogue (Produto → Variação → Oferta), the loyalty points ledger and customer statement, and the identity rule that keeps admin and app accounts disjoint on one shared Supabase user base. He integrated freight quotes and tracking through Melhor Envio, a Brazilian freight-quoting platform, and both Mercado Pago and Stripe, because the client wanted the choice. Daniel built the webhook handlers that receive the payment notifications and Melhor Envio's tracking updates. He designed the scheduled messaging for the client's estimate of 3,000 members (from its regional sales, assuming at least 40% capture): messages queue on Cloudflare Queues with a planned send time, each coupon is tied to its message and released by a Cron Trigger five minutes before the send, tests check the coupon's coverage, and if the release fails the message is not sent. The same codebase serves the REST API consumed by the Café Cajubá mobile app, and ships with a dedicated warm-up Worker to keep the serverless runtime out of cold start. Daniel wrote by hand, in SQL, the Supabase row-level security policies and a view of each customer's points balance. The client approved it; it has not been launched, pending the client's payment.

9 of the panel's 10 modules delivered in ~10 weeks, approved by the client, not yet launched

• TanStack Start
• React
• TypeScript
• Supabase
• PostgreSQL
• SQL
• Drizzle ORM
• Cloudflare Workers
• Cloudflare Queues
• Melhor Envio API
• Mercado Pago
• Stripe
• Vitest
• Tailwind CSS
• Zustand
• TanStack Query

BaixarMusica

BaixarMusica is a minimal Windows GUI wrapper around spotdl that lets a user pick a folder, paste a Spotify or YouTube link (or a text search), and download audio as 320k mp3 without installing Python, spotdl, or ffmpeg separately. It self-updates its bundled spotdl and ffmpeg components in the background, verifies downloads via SHA256, falls back to the previous spotdl binary if an update breaks, and includes a duplicate-detection feature that compares ID3 tags (artist/title) within a folder rather than filenames.

• Python
• PowerShell (build.ps1)
• spotdl
• ffmpeg
• pytest

Danbel

Danbel is a planned offline-first React Native mobile app for tracking strength training workouts (exercises, sets, loads, reps, RIR) and progression over time, organized around a "planned vs. actual" concept across training cycles. As of the repo snapshot it is in the planning phase only, with product vision, domain model, specs, and ADRs written but no application code yet.

• React Native
• Expo
• TypeScript
• Drizzle

Folhas Que Salvam Kanban

Built a Kanban system for the Folhas Que Salvam project to distribute tasks across teams, monitor progress, and reward contributors on a points basis, improving how project tasks were managed.

• Next.js
• Nest.js
• Prisma
• Clerk
• Tailwind
• Jest
• TypeScript