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Leandro Bertalhia

Available for new projects

Fullstack Developer building fast, scalable, production-ready products.

Fullstack developer with a strong backend foundation, focused on Node.js, TypeScript, NestJS, scalable APIs, performance and production-grade products.

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Foto de perfil de Leandro BertalhiaLeandro BertalhiaSanta Bárbara d'Oeste, SP, Brasil

  • 9

    production projects

    Built from scratch

  • 10+

    APIs & backends

    Node.js, NestJS and TypeScript

  • 70%

    latency reduction

    In the v1 → v2 refactor

  • 10x

    built for scale

    Queue-driven architectures

About

From industrial automation to production software

Strong backend, product mindset and an obsession with reliable systems.

I'm a fullstack developer with a strong backend foundation: Node.js, TypeScript, NestJS, PostgreSQL and message-queue driven architectures. I've built 9 production projects from scratch, refactored architectures for 10x growth and cut latency by up to 70%. Before software, I worked in electrical maintenance and industrial automation on 24/7 production lines at Suzano — an experience that shaped how I think about reliability, observability and resilience in systems. Today I work at Hybriun Desenvolvimento with technical leadership, mentoring and strategic projects like Edufor and Simtro.

Projects

Featured projects

Real products, in production, built end to end.

  • Financify

    Mobile Finance App

    Complete personal finance mobile app with social authentication, analytics dashboard, Pluggy Open Finance integration, push notifications, biometrics, E2E tests and production-ready architecture.

    In productionReact NativeExpoTypeScriptNode.js

  • Edufor

    B2B2C Educational Platform

    Educational platform with 1000+ simultaneous users, course management, educational dashboard, payment integration, scalable APIs and high availability.

    In productionNode.jsNestJSTypeScriptPostgreSQL

  • Simtro

    Banking Security SaaS

    Mission-critical SaaS for banking security control, banking integrations, robust APIs, multi-tenant architecture and 99.9% uptime.

    In productionNode.jsNestJSTypeScriptPostgreSQL
View all projects

Experience

Professional journey

  1. May 2025 — Present

    Fullstack Developer

    Hybriun Desenvolvimento · Americana, SP

    Fullstack development of production products, focused on backend, architecture and performance.

    • 9 production projects built from scratch.
    • 10+ APIs/backends built with Node.js, NestJS and TypeScript.
    • Architecture refactor from v1 to v2 using message queues.
    • Latency reduction of up to 70%.
    • Systems designed for 10x growth.
    • Technical leadership, mentoring, onboarding, code review and engineering standards.
    • Strategic projects: Edufor and Simtro.

  2. Jan 2023 — Dec 2024

    Maintenance Electrician

    Suzano Limeira · Limeira, SP

    Electrical maintenance and industrial automation in a 24/7 production environment.

    • Maintenance in 24/7 paper and pulp production lines.
    • Worked alongside a senior automation technician on a 90%+ automated production line.
    • Troubleshooting under pressure in production environments.
    • Practical experience with industrial automation, sensors, valves, Siemens PLCs and regulated environments.
    • Operational background that strengthens software reliability, observability and resilience.

Stack

Technologies I use every day

Tools chosen for performance, type-safety and scale.

Backend & APIs

  • Node.js
  • TypeScript
  • NestJS
  • Message Queues
  • tRPC
  • Zod

Frontend & Mobile

  • Next.js
  • React
  • React Native
  • Expo
  • TanStack Query
  • Tailwind CSS
  • shadcn/ui

Databases

  • PostgreSQL
  • MySQL
  • Drizzle
  • Prisma

DevOps & Cloud

  • Docker
  • Cloudflare
  • Cloudflare R2

Process

How I work

From problem to deploy, with engineering quality at every step.

Contact

Let's build something together?

Open to new projects, opportunities and good engineering talk.

Email me