João – React Native, Next.js, React

I worked on the multi-tenant React Native and Expo app (iOS and Android), the Next.js web app, and Smart TV clients (Samsung Tizen, LG WebOS and Android TV), in a modular white-label architecture shared by both products.

• I evolved a modular architecture (core, design system, features and tenants) so branded apps share one codebase.
• I shipped offline-first capabilities: lesson downloads, offline playback, MMKV and TanStack Query persistence, offline check-in and a retry sync queue.
• I reworked video watch-progress tracking to playback seconds, ranges and retries, consistent across mobile, web and TV.
• I built and consumed internal npm libraries (tenant config, heartbeat/trace and analytics) shared by all clients.
• I automated CI/CD: GitHub Actions (lint, TypeScript, Jest, coverage and per-tenant Android APKs) and EAS Build for iOS.
• I delivered product features: marketplace, player, Chromecast, IAP and subscriptions, feature flags, i18n (pt-BR, es and es-MX) and observability.

I worked as a Senior Frontend Developer, focused on React, React Native and Next.js.

• implemented and evolved Livelo's design system on web and mobile.
• built on my own the second-factor authentication (2FA) microfrontend: on the web, a Next.js microfrontend; on mobile, the equivalent flow in React Native.
• implemented native Keychain integration in Objective-C on iOS and Java on Android, then migrated that library to Swift and Kotlin.
• shipped TypeScript product features across the loyalty program's apps and web, working with the client squad.

I worked as a Senior React Native Developer at a US consultancy, allocated to a youth-sports and coaching marketplace. I took part in the full cycle from MVP and beta to launch, then kept evolving the main mobile app and the web admin.

• I built and maintained React Native features for iOS and Android, from MVP to store launch, on a coaching marketplace.
• I shipped a GraphQL typing-generation pipeline between front and back and a build/test/deploy loop with Firebase App Distribution (iOS and Android), in the same spirit as Integra.
• I integrated the Plaid SDK for US open banking.
• I contributed to the web admin, architecture, code review, quality bars, beta testing and maintenance.

I worked as a Consultant Front-End Developer at Avanade, on two enterprise accounts: Bank J. Safra Sarasin (Wealth app, Swiss private banking) and Seara (Integra app, Brazilian agribusiness, JBS group). The project is in the agribusiness sector, and its primary objective is to create a comprehensive digital platform to streamline and enhance the various processes within the agribusiness ecosystem.

• React Native app (no Expo) for integrated poultry and swine producers (farm, batches, documents, invoices). Offline with WatermelonDB. GraphQL in the app, with a typing-generation pipeline that sped up development and integration with the Java backend (I only touched Java in small ways).
• I owned 100% of CI/CD. I replaced manual deploy with Fastlane and sped up final tests with the client, QA and PM via Firebase App Distribution (Android and iOS).
• I cut bug-response time by 80% and initial load from 4 to 8 minutes down to 45 s on a bad network and 0.8 s on a good network.

This project involved creating a digital trading platform for a client in the Swiss banking sector. The platform included a QR code payment system, online trading capabilities, asset management, and a watchlist feature for monitoring specific stocks and financial instruments.

• Launched the product on both Android and iOS;
• Was responsible for the development of some features like the watchlist and QR code payments;
• Redesigned all search fields to perform better with debounce;
• Refactored code to achieve better performance;

Main achievement: The project has successfully met its objectives and demonstrated the potential of digital technology. The feedback received from the initial group of users was highly positive and highlighted the potential of digital technology to revolutionize the banking and trading experience.

The project is a single tool with end-to-end integration, enabling real-time communication, organization, management, and data security for schools.

• Implemented advanced full-text search;
• Worked on the development of the two main products, using internal tools and CI/CD automation;
• Created a text formatting library for React Native internally;
• Wrote unit, integration, and e2e tests;
• Participated in technical leadership training and joined study groups on microservices and design systems.

Minute of Glory: Presented internal lectures on "React Native Architecture and State (2021)" and maintained internal component libraries for web and mobile.

The project was an internal Edtech application allowing public school classes to continue functioning remotely during the pandemic.

• Created front-end and back-end architecture;
• Participated in planning and workflow definitions;
• Developed CI/CD automation and on-premise solutions;
• Built front-end components library;
• Wrote unit, integration, and e2e tests;
• Integrated with different providers.

Main achievement: Impacted almost 200k students from Piaui public schools through home education during the COVID-19 pandemic.