I build fast, scalable products.
I'm Donathan Queirós, a freelance full‑stack developer focused on TypeScript, React/React Native, Node/NestJS, Java/Spring Boot and SQL. I help teams ship reliably with excellent DX and performance.
- TypeScript
- React
- Next.js
- React Native
- Node
- NestJS
- Java
- Spring Boot
- Prisma
- PostgreSQL
- Vite
+5
Years
50+
Projects
TS • React • Node
Stack
Startups & SMEs
Clients
Preferred Stack
Frontend
- React + Next.js 15 (App Router), Server Components
- TypeScript, Tailwind, shadcn/ui, Radix
- Performance first: code‑splitting, lazy routes, images
- Accessibility and i18n best practices
Backend
- NestJS (Fastify), Node 20+, Zod/Class‑Validator DTOs
- Java + Spring Boot for enterprise workloads
- PostgreSQL + Prisma, caching (Redis), queues
- Observability: structured logs, traces, metrics
Let's work together
Tell me about your project. I'll respond with options, timelines, and an estimate.