--- title: "João Pereira — Senior Mobile Developer" description: "Portfolio of João Pereira, a senior mobile developer with 6+ years shipping production mobile apps across fintech, social networking, logistics and live streaming." url: https://joaopereiradev.vercel.app/en source: https://joaopereiradev.vercel.app/en generated_by: aeo.js --- # João Pereira — Senior Mobile Developer Portfolio of João Pereira, a senior mobile developer with 6+ years shipping production mobile apps across fintech, social networking, logistics and live streaming. Over 6 years shipping production mobile apps for fintech, social and logistics platforms. I care about clean architecture, smooth UI and getting things through App Store review without losing my mind. ## FAQ ### Who is João Pereira? João Pereira is a Senior Mobile Developer with over 6 years of experience building production React Native and TypeScript apps for fintech, social networking, logistics and live streaming platforms. ### What does he specialize in? Taking mobile features from architecture to production: designing maintainable solutions, integrating APIs and native SDKs, handling platform-specific requirements and shipping reliable releases to the App Store and Google Play. ### How many apps has he published? He has published 10+ apps across fintech, social networking, delivery and live streaming. ### Is he available for new work? Yes. He is open to freelance or contract work and to full-time roles. Reach him through the Contact screen, by email at joaovitorspereira@gmail.com, or with the book_intro tool of the MCP server. ### Can an AI agent read this portfolio? Yes. It exposes llms.txt, a JSON Resume file, WebMCP tools in the browser and a remote MCP server with the tools get_resume, get_projects, check_availability and book_intro. ## Skills - Mobile: React Native, Expo, Expo Router, React Navigation, TypeScript, Zustand, Redux, Context API, React Query, React Native Web, Native SDK Integration, Native Modules, Kotlin, Biometrics, App Attest, Secure Storage, Deep Linking, Push Notifications, EAS Build, EAS Update - Front-End: TypeScript, JavaScript, React, Next.js, React Native Web, Styled Components, React Query, GraphQL, Three.js, REST APIs - Tooling & Practices: Git, GitHub, Firebase, REST APIs, GraphQL, Postman, Android Studio, Xcode, Apple App Store Connect, Google Play Console, EAS, CI/CD, Figma ## Work ### Senior Mobile Developer Senior Mobile Engineer responsible for the end-to-end technical direction of a fintech mobile application built from the ground up. Owned the mobile architecture and made key technical decisions focused on scalability, maintainability, security, and long-term code quality. Led the day-to-day engineering workflow, including breaking down technical requirements, delegating work to junior developers, conducting code reviews, and establishing development standards and engineering practices across the project. Defined and maintained the project's Git workflow, branching strategy, and versioning structure to support a consistent and controlled development process. Designed and implemented secure authentication and identity flows using encrypted storage, App Attest, biometrics, and platform-level security capabilities. Developed and maintained REST API integrations in close collaboration with backend engineers, ensuring reliable communication between the mobile application and backend services. Owned the mobile release lifecycle across iOS and Android, including production builds, App Store and Google Play releases, and over-the-air updates. Investigated and resolved production issues while continuously improving application stability, performance, and maintainability. Also worked on a POS application integrating a third-party native SDK. Designed and implemented native Kotlin modules and a React Native native bridge to expose the SDK's capabilities to the JavaScript layer, keeping the application architecture centered around React Native while encapsulating device-specific and SDK-level functionality within the native layer. Technologies: React Native, Expo, TypeScript, Zustand, React Query, REST APIs, Expo Router, Native SDK Integration, Kotlin, Native Bridge, POS, Architecture, Code Review, Git Branching Strategy, App Attest, Biometrics, EAS Update, Apple App Store, Google Play ### Mobile Software Engineer Mobile Software Engineer on a large-scale social networking platform used by thousands of users, built around communities, a live feed, and rich post interactions. Developed and maintained production features focused on scalable UI, performance, and user engagement. Built the client side of the core social features: communities, feed posting, embedded content inside posts, real-time likes and dislikes, and comments on each post. Used GraphQL with Apollo Client to query and mutate data and keep the feed, reactions, and comments up to date live. Worked against a role-based access control (RBAC) backend, shaping the interface and the actions available to each user around their role and permissions. Migrated an existing React Native application from React Native CLI to Expo, improving maintainability and simplifying the development and deployment workflow. Built gamification and engagement features, reusable and performant UI components, and cross-platform experiences using React Native Web, collaborating with designers, backend engineers, and QA to deliver and maintain production features. Technologies: React Native, Expo, React Native Web, TypeScript, GraphQL, Apollo Client, React Query, Styled Components, REST APIs ### Mobile Software Engineer Developed mobile features focused on delivery management, real-time tracking, and location-based functionality. Implemented Google Maps integration, route visualization and delivery workflows, as well as delivery tracking capabilities. Integrated Firebase Cloud Messaging for push notifications and consumed REST APIs while collaborating with backend developers. Also participated in application publishing, maintenance, and production support. Technologies: React Native, Firebase, Firebase Cloud Messaging, Google Maps, Redux, REST APIs ### Mobile Software Engineer Developed reusable React Native components and mobile functionality for live video streaming experiences. Focused on building maintainable interfaces, improving application usability, and optimizing mobile application performance. Worked closely with product and design teams to translate requirements into production-ready mobile features. Technologies: React Native, TypeScript, JavaScript, Reusable Components, Mobile UI, Performance Optimization ### Frontend & Mobile Developer Developed applications for web and mobile platforms using React and React Native, building reusable UI components and integrating applications with REST APIs, contributing to production-ready features and application maintenance. Worked alongside senior developers throughout the development process, contributing to feature implementation, code maintenance, releases, and improvements to existing applications. Technologies: React, React Native, JavaScript, TypeScript, REST APIs, Reusable UI Components, Git ## Contact - Email: joaovitorspereira@gmail.com - GitHub: https://github.com/JoaoVitorSPereira - LinkedIn: https://www.linkedin.com/in/joaovitorspereira/