Available for new work

NAÉLIO
FREIRES

I'm a front-end developer with 6+ years of experience. I build web and mobile apps that are fast, clean, and easy to use. I work mostly with React, React Native, TypeScript, and NestJS.

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NF

Front-End Developer

React · React Native · TypeScript

6+ Years
Building web & mobile apps
React Native
Offline-first · Realm DB · MobX

Core Stack

React React Native TypeScript Node.js NestJS FastAPI

Core Expertise

What I do best: clean architecture, mobile apps, and solid quality on every project.

Front-End Architecture

React, TypeScript, and clean structure to keep apps fast and easy to grow.

Mobile & Offline-first

React Native apps that work offline and stay in sync, even on weak networks.

State, APIs & Quality

State tools (Redux, Zustand), APIs (REST, GraphQL), and testing with Jest and Cypress to ship with confidence.

Bots & AI Agents

Bots and AI agents that automate tasks and help teams save time.

Professional experience

Career trajectory

How I got here: from shipping real products and offline-first mobile apps to building data-rich interfaces and working with AI.

Jul 2023 – Jul 2026 Nexla Frontend Developer

Building data-heavy interfaces with AI

  • Built React, Redux, and TypeScript interfaces to handle large amounts of data, keeping the app fast and smooth.
  • Shipped AI tools that make it easier to transform data and understand the workflow.
  • Worked closely with QA and engineering to ship stable releases.
Current
Feb 2022 – Jul 2023 Koombea Full Stack Developer

Shipping web and mobile apps for clients

  • Worked on web apps with React and Next.js, and mobile apps with React Native, using GraphQL.
  • Helped build an internal React component library to keep the UI consistent and faster to build.
  • Helped with deployments, code reviews, and secure teamwork across client projects.
Scale
Oct 2020 – Mar 2022 HeavyConnect Mobile Developer

Offline-first apps for field work

  • Built React Native apps for farming work, using MobX and Realm DB.
  • Handled data sync and state for weak connections, working with design on simple, practical flows.
  • Made the app more reliable across different phones and screen sizes for daily field use.
Offline-first
Oct 2020 – Mar 2022 Esportudo Mobile Developer

Launched a sports app on web and mobile

  • Built a new React Native app and a responsive Next.js website from scratch.
  • Improved SEO, speed, and content personalization for sports fans.
  • Added categories and social sharing to keep users engaged.
Launch

Selected Projects

Some of my work with AI, automations, migrations, and offline-first apps.

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Nexla AI Chatbot

AI chatbot to transform data, with change checks

React AI E2E
SPORTS

Esportudo Web & Mobile

Custom sports news on Next.js and React Native

React Next.js Redux

App Upgrade: Ionic 3 to React Native

Planned the migration step by step, with releases and QA

React Native Migration
> sync under unstable network

HeavyConnect Offline-first App

Farming app with Realm DB and MobX sync

React Native Offline

Brazil · Open to Relocation

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