Inbox rebuild with cursor-based pagination and list virtualization — payload from 6.7 MB down to 19 KB (~400x), no UI freezes with thousands of records.
Shared database with tenant_id, Row Level Security and composite indexes for real isolation.
Idempotency, signature validation, dead letter queue and reconciliation with Asaas and Mercado Pago.
ArchitectureA route-based micro frontend experiment: the Uses page is now served by another Next.js app on the same domain. Why the expensive part was the frame, the monorepo it took, and what only showed up in production.
FrontendAn experiment: an Angular 22 app, with its own repo and deploy, running as a micro frontend inside this Next.js post. The contract, the measured cost, and when it isn't worth it.
ProductIn 2025 I launched my first product: partners, contacts in the niche, a launch and investor conversations. By the end of the year, we shelved it. Why distribution, not code, decided it.
CareerA personal look at going from junior to senior engineer: why the hard part shifts from writing code to scope, ownership, trade-offs and deciding what to build.
ArchitectureAccounts that pay and never activated do not show up in a usage-decline metric — they do not even exist in the events table. Why the defect is in the FROM, why NOT IN silently returns zero rows, and why the first result of this query is almost always false.
FrontendA QR Code component was breaking in the PIX checkout of a dropshipping SaaS while the backend answered 200 — revenue leaking without a single log line. How we instrumented the frontend with session context, what we deliberately did not capture in a payment flow, and the gap still open.
FrontendHow I rebuilt a B2B SaaS inbox that loaded ~20,000 conversations at once — cursor-based pagination with React Query, list virtualization with TanStack Virtual, and the trade-offs behind each decision. Payload per request: from ~6.7 MB to ~19 KB (~400x).
EngineeringHow to test webhooks, idempotency, PIX and multiple gateways (Stripe, Asaas, Mercado Pago) without actually charging — sandbox, mocks, contracts and resilience testing.
Case Study95 Prisma models, multi-tenant + multi-branch, WhatsApp AI with RAG and Whisper, gradual v1→v2 migration, and fiscal invoice emission with fallback.
Case StudyArchitecture, technical decisions and real challenges of scaling a dropshipping SaaS platform with Mercado Livre, Shopee, Asaas and Mercado Pago integrations.
ArchitectureHow to implement the Circuit Breaker pattern in Node.js applications to handle unstable external APIs — state machine, fallbacks, retry, and production monitoring.
ArchitectureHow to structure payment webhook handling in production — signature validation, idempotency, async processing, reconciliation, and real-world failure handling.
FrontendA practical guide on building a scalable design system using Shadcn UI, Tailwind CSS and React — ensuring visual consistency and development productivity.
