I build vertical SaaS and business software where domain logic, reliability and production constraints matter.
Core stack: TypeScript · Next.js · React · PostgreSQL · Prisma / Drizzle · Python · Stripe · Vitest · Playwright
Portfolio: https://santana64.github.io/portefolio/
Quality and compliance platform with audit workflows, evidence management, billing, AI-assisted analysis and server-generated reports.
Next.js 16 · TypeScript · Prisma · PostgreSQL · Stripe · Anthropic · Sentry · Vitest · Playwright
Construction quoting and invoicing SaaS with domain calculations, PDF generation, subscriptions and AI-assisted quote generation.
Next.js 16 · TypeScript · Prisma · PostgreSQL · Stripe · Anthropic · Vitest
Unpaid-rent case management for landlords: traceable actions, payment allocation, document generation and subscription controls.
Next.js 16 · TypeScript · Prisma · PostgreSQL · Stripe · PDFKit · Vitest
Client-delivered partner directory and subscription product with tiered access, Stripe billing and PostgreSQL persistence.
Next.js 15 · TypeScript · Drizzle · PostgreSQL · Stripe
- Domain modelling before UI complexity.
- Reproducible builds, migrations and explicit production constraints.
- Automated tests for business-critical logic and end-to-end flows where they add value.
- Security-sensitive behaviour documented rather than hidden behind marketing claims.
- AI-assisted development treated as leverage, with verification remaining the source of truth.
I am deliberately consolidating the public portfolio around fewer, deeper projects. Repositories that are experiments, incomplete prototypes or historical coursework are not presented here as production systems.