Frontend Engineer building fast, scalable interfaces for production SaaS — React, Next.js and performance engineering.
TypeScript end to end. Full-stack range as a differentiator: payments, multi-tenant architecture and AI running in real products.
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.
How 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).
A practical guide on building a scalable design system using Shadcn UI, Tailwind CSS and React — ensuring visual consistency and development productivity.
Architecture, technical decisions and real challenges of scaling a dropshipping SaaS platform with Mercado Livre, Shopee, Asaas and Mercado Pago integrations.
95 Prisma models, multi-tenant + multi-branch, WhatsApp AI with RAG and Whisper, gradual v1→v2 migration, and fiscal invoice emission with fallback.
How to test webhooks, idempotency, PIX and multiple gateways (Stripe, Asaas, Mercado Pago) without actually charging — sandbox, mocks, contracts and resilience testing.
A practical guide on building multi-tenant SaaS architectures using PostgreSQL — covering data isolation, database modeling and architectural best practices.
How to structure payment webhook handling in production — signature validation, idempotency, async processing, reconciliation, and real-world failure handling.
