Caio is available for hire

Caio F Melo

Verified Expert in Engineering

Full-stack Developer

Campina Grande, Brazil

Toptal member since November 4, 2022

Expertise

Web Development Full-stack JavaScript React.js TypeScript React Native Firebase Node.js Redux GraphQL NestJS Next.js Startup Development Back-end Developers

Bio

Caio is a full-stack engineer with more than five years of experience working on real projects since completing his bachelor's degree in computer science. He specializes in JavaScript or TypeScript with React and Node.js. Caio has built numerous UIs and high-performing APIs and solved problems according to clients' needs.

Portfolio

FeedMee, Inc.

React Native, Expo, TypeScript, iOS, Android, Mobile App Development, Clerk...

Red Flags LLC

iOS, App Store, CI/CD Pipelines, React Native, Amazon S3 (AWS S3), Node.js...

PressBeyond LLC

React Native, Back-end, TypeScript, AWS Lambda, SQL, PostgreSQL, SOAP APIs...

Experience

Node.js - 5 years
Software Engineering - 5 years
JavaScript - 5 years
React - 5 years
Full-stack Development - 5 years
React Native - 4 years
TypeScript - 4 years
Next.js - 1 year

Work Experience

Senior React Native Engineer

2025 - 2026

FeedMee, Inc.

Built the Meelo React Native app from the ground up with Expo Router, TypeScript, and a shared component library covering auth, onboarding, home, groceries, reminders, AI chat, and profile flows.
Implemented Clerk authentication with email/password, Google SSO, verification-code password reset, protected routes, and onboarding-aware routing, cutting friction for first-time users.
Integrated the Go back-end REST APIs for profiles, households, user state, groceries, reminders, calendar events, and messages through a typed API client with automatic token injection.
Developed the AI chat experience with optimistic messages, typing indicators, markdown rendering, retry handling, feedback actions, sharing, and graceful error states.
Integrated LiveKit's React Native Agents SDK to ship a real-time AI voice mode, resolving WebRTC and audio-session conflicts across iOS and Android.
Integrated Go back-end APIs for profiles, households, groceries, calendar events, messages, and recipes, and documented API requirements for the back-end team.
Set up Sentry error monitoring and Mixpanel analytics with session and screen tracking, and fixed a Clerk token-refresh bug that forced users to restart the app.
Led the V2 redesign on React Native 0.81 and Expo 54 with the New Architecture, building a design-token system and an iOS 26 Liquid Glass UI with graceful fallbacks.
Shipped V2 features end to end, including recipe search, a for-you feed, cookbooks, a My Kitchen grocery list, recipe archiving, follows, and keyboard-synced chat animations.
Owned iOS staging releases to TestFlight and delivered features with a spec-driven, AI-assisted workflow using Claude Code.

Technologies: React Native, Expo, TypeScript, iOS, Android, Mobile App Development, Clerk, Authentication, REST APIs, Go, LiveKit, AI Voice Agents, AI Chatbots, Sentry, Push Notifications, Context API, Application State Management, React Native Reanimated, AI Integration, API Integration, Claude Code, AI Development, Mobile, Email Authentication, User Authentication, AI Tools, TestFlight, Front-end Development

Full-stack Mobile Developer

2025 - 2026

Red Flags LLC

Built core React Native dating app features, including profile flows, matching behavior, likes, notifications, and user-facing subscription screens.
Implemented RevenueCat subscription webhooks to track purchases, renewals, cancellations, and expirations across iOS and Android users.
Developed admin subscription metrics and user pagination tools, helping the team monitor premium users and manage account data more efficiently.
Fixed mobile release blockers across iOS and Android, including SDK compatibility issues, build errors, and production deployment problems.

Technologies: iOS, App Store, CI/CD Pipelines, React Native, Amazon S3 (AWS S3), Node.js, RevenueCat, Android, Google Play Store

Full-stack React Native Developer

2024 - 2026

PressBeyond LLC

Led front-end development for PressBeyond’s React Native mobile app, delivering hotel discovery, booking, guest checkout, booking management, and post-booking user flows across iOS and Android.
Built and maintained key booking experiences, including guest checkout, confirmation flows, booking lookup by confirmation number and last name, magic-link access, resend confirmation, and manage-booking screens.
Implemented a scalable SEO web experience in Next.js for hotel, city, region, and review pages, improving the platform’s ability to expose destination and hotel content through search-optimized landing pages.
Refactored image handling across the web experience to improve compatibility with direct CDN image URLs, SEO crawlers, and AI-powered content extraction workflows.
Collaborated across product, back-end, and design requirements to ship booking, search, SEO, analytics, and infrastructure-related improvements in a fast-moving travel technology product.

Technologies: React Native, Back-end, TypeScript, AWS Lambda, SQL, PostgreSQL, SOAP APIs, JSON REST APIs, Node.js, Google Play Store, App Store, iOS, Vercel, Next.js

React Native Developer

2024 - 2025

Gamut Technologies LLC

Led the end-to-end development of a HIPAA-compliant React Native referral app for a specialized burn hospital, enabling referees, physicians, and admins to securely manage patient referrals, approvals, and analytics.
Implemented automated CI/CD pipelines with GitHub Actions and EAS to streamline iOS and Android builds, App Store/Play Store submissions, and internal testing, reducing release overhead and ensuring consistent delivery.
Optimized referral workflows and organization assignment features by redesigning UI/UX components, consolidating duplicated logic, and integrating push notifications, resulting in faster case routing and improved physician response times.

Technologies: React Native, REST, Node.js, Expo

React Native and React Developer

2024 - 2024

Generation Society GmbH & Co. KG

Fixed bugs and developed new features from the legacy app built in React Native.
Wrote down the project architecture with all AWS resources used to understand the project issues and suggest improvements.
Launched a Testflight MVP version with all legacy features working as expected.

Technologies: React, React Native, AWS Lambda, REST, iOS, Node.js, GraphQL

React Native Developer

2023 - 2024

AmVentureX Inc.

Developed multiple reusable components and screens from scratch in React Native, ensuring adherence to design specifications provided in Figma.
Demonstrated proficiency in tracking and resolving bugs using BugSnag, ensuring timely identification and rectification of issues to maintain application stability and performance.
Led the successful launch of the minimum viable product (MVP), incorporating essential features such as seamless onboarding flows, deep linking, push notifications, and chat functionality.

Technologies: React Native, TypeScript, Redux, Axios, Fastlane, Node.js, Retool

Full-stack React Native Developer

2023 - 2023

Coached by B LLC

Developed a functional app in one month using React Native and Firebase.
Implemented authentication and the main app flow, allowing users to take English lessons with two types of exercises.
Implemented the recording exercises feature to record the user to use later be used by an AI.

Technologies: React Native, HTML, CSS, JavaScript, Full-stack

React Native Engineer

2023 - 2023

Polarity Labs, LLC

Implemented features such as sorting/ordering the lists with manual reordering by drag-and-drop, friends and friend requests, and sharing the app with deep links.
Developed sign-in with social accounts to allow the users to authenticate to the app using a Google or Apple account.
Tested the Android version and tracked errors and performance issues.

Technologies: React Native, Mobile Development, React, Startups, Google Cloud Platform (GCP), Firebase, Early-stage Startups

Senior React Native Developer

2023 - 2023

Fypm

Developed new features such as "rate my offer," which retrieves the user offer information and rates the offer value based on the data saved in the database (If it's below or above the average market).
Improved some flows with new fields and steps to validate a new offer.
Created some Firebase dashboards to validate new users and new offers with screenshots using https://retool.com/use-case/firebase-dashboard.

Technologies: React Native, TypeScript, React, Firebase, React Native for Web

Senior Node.js Developer

2022 - 2023

Cyber iSight

Developed a SaaS app with Node.js and React to handle assessments and automate cyber security jobs.
Created a dashboard with tables and charts to analyze and compare the data with previous assessment data.
Deployed an MVP to AWS and presented it to potential clients that work with it.

Technologies: Node.js, JavaScript, TypeScript, Bootstrap, PostgreSQL, React, Minimum Viable Product (MVP), Cypress, Express.js

Full-stack Engineer

2021 - 2022

Trio

Rebuilt a legacy app and its new features for betting sports games using React Native, Expo, and Firebase, contributing as the main and sometimes unique developer, with each game gaining 1,000 users.
Built an app where users could select NBA and NFL games, join contests, answer questions, receive notifications, and play against friends.
Created a dashboard for betting sports games using React and Firebase, allowing admins to sign up for new games and track users and game data.
Developed cryptocurrency app screens from scratch following a Figma design, using animations and new features from React Native.
Reviewed pull requests from team members, encouraging them to follow best practices and clean code.

Technologies: JavaScript, TypeScript, React, React Native, Node.js, GraphQL, NestJS, Firebase, Expo, Full-stack, MobX, Storybook, Android, iOS

Mid-level Software Developer

2020 - 2021

Full-stack Engineer

2020 - 2020

Evermart

Developed a back-end to a system similar to Hotmart, where users could sell online courses and ebooks.
Worked on the back-end side with Node.js and deployed and tested the Node.js server on AWS.
Led team members to create alerts and multiple CRUD functions and connect them to multiple foreign APIs.

Technologies: Node.js, React, JavaScript, TypeScript, Sequelize, Express.js

Full-stack Engineer

2019 - 2020

Self-employed

Developed a delivery system similar to iFood using React, React Native, Redux, Node.js, and Firebase.
Built screens, fixed bugs, and developed new customized features.
Rebuilt a legacy app from 2018 with fixes and learned from there.

Technologies: TypeScript, Firebase, Redux, React Native, React, Node.js, Full-stack, Material UI

Software Engineer Intern

2019 - 2020

Wildlife Studios

Created software solutions in partnership with Wildlife Studios.
Retrieved and manipulated data from games to generate insights, find patterns, and create alerts.
Developed a platform for marketing and distribution.
Worked on web development with React, React Native, JavaScript, Node.js, and AWS.

Technologies: Go, C#, React, Node.js, JavaScript, Software Engineering

Full-stack Developer

2017 - 2018

ASUS

Developed a project to manage hire options for ASUS lab at the University using Node.js and Angular.
Engaged as the project's primary developer and led team members to accomplish project goals.
Contributed to optimizing and enhancing legacy software.
Created a new resource for legacy software, such as Jira, used in a PhD work.

Technologies: AngularJS, Angular, Springbot, Java, Node.js, Web Development, Software Engineering, Full-stack Development, Full-stack

Project History

RealTime Live | React Native Mobile App

A React Native app for playing real sports games and contests and winning real money.

I was the primary developer and, for a while, the only developer. I rebuilt the legacy project, adding new features and redesigning the entire app, following a Figma design. I also conducted weekly deployments and fixed bugs. Additionally, I worked in the Backoffice with React to sign up new games and track users' data.

Path | Cryptocurrency Mobile App

https://www.pathcrypto.com/

A crypto trade application for users to create their portfolio and crypto wallet.

I was the front-end developer for six months, developing pages and reusable components following best practices and clean code principles. I also reviewed pull requests from team members, encouraging them to improve their code quality. Later, I started to work on the back-end team with Node.js and NestJS, creating new routes, tests, and models.

Share Student Living | React Native App

https://sharesl.com.br/

A React Native app with a React Backoffice for students living in the company buildings in São Paulo, Brazil.

I was one of the project's main front-end developers. I worked on the mobile and mostly on the React Backoffice, creating tables for managing data, forms, and graphs.

Education

2015 - 2019

Bachelor's Degree in Computer Science

Federal University of Campina Grande - Campina Grande, Paraiba, Brazil

Certifications

SEPTEMBER 2020 - PRESENT

Rocketseat GoStack Bootcamp

Rocketseat

Skills

Libraries/APIs

React, Node.js, Redux-Saga, MobX, React Native for Web, SOAP APIs, REST APIs, Context API

Tools

Sequelize, Expo, Fastlane, Retool, Sentry, Claude Code, TestFlight

Languages

JavaScript, TypeScript, GraphQL, Go, C#, Java, HTML, CSS, SQL

Frameworks

React Native, Redux, NestJS, AngularJS, Angular, Next.js, Bootstrap, Cypress, Express.js, Material UI

Platforms

Firebase, Android, iOS, Google Cloud Platform (GCP), AWS Lambda, Vercel, RevenueCat, Clerk, LiveKit, Mobile

Paradigms

Mobile Development, REST

Storage

PostgreSQL, Amazon S3 (AWS S3)

Other

Web Development, Software Engineering, Full-stack Development, Full-stack, Springbot, Minimum Viable Product (MVP), Storybook, Startups, Early-stage Startups, Axios, Back-end, JSON REST APIs, Google Play Store, App Store, CI/CD Pipelines, Mobile App Development, Authentication, AI Voice Agents, AI Chatbots, Push Notifications, Application State Management, React Native Reanimated, AI Integration, API Integration, AI Development, Email Authentication, User Authentication, AI Tools, Front-end Development

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