Raphael Sampaio
@raphaelsampaio1
Senior mobile engineer specializing in scalable, high-performance React Native apps for iOS and Android.
BrazilWhat I'm looking for
I am a Senior Mobile Engineer with 7+ years building scalable, high-performance iOS and Android applications using React Native, working with international clients and FinTech startups. I focus on code quality, security, and delivering user-centric mobile solutions while optimizing complex UI rendering and global state management.
I have architected and implemented maintainable, scalable features for North American markets, collaborated directly with US stakeholders, and reduced technical debt by refactoring legacy components into reusable hooks. I drove performance optimizations (audio/video players, FlatList rendering) and established CI/CD pipelines and automated testing practices that increased code coverage substantially.
My background includes strong security-focused contributions, integrating Firebase (Auth, Firestore, Crashlytics), implementing feature flagging and dynamic updates, and acting as a security analyst within mobile teams. I bring a pragmatic, test-driven approach and a commitment to maintainability and developer ergonomics.
Experience
Work history, roles, and key accomplishments
Senior Mobile Engineer
AssureSoft
Aug 2024 - Mar 2026 (1 year 7 months)
Architected and implemented new React Native features focused on maintainability and scalability for the North American market, reducing technical debt through refactoring and improving media playback performance.
Mobile Engineer
ScrumLaunch
Sep 2022 - Mar 2024 (1 year 6 months)
Engineered a high-performance video feed and optimized FlatList rendering to resolve memory leaks and achieve 60fps scrolling on low-end devices; migrated and maintained codebase using Bare Workflow and Expo.
Mobile Engineer
Grão
Jul 2020 - Jul 2022 (2 years)
Developed core features for a FinTech super-app, implemented Firebase suite integrations and security enhancements, and increased test coverage by 80% through Jest and React Native Testing Library.
Jr Mobile Developer
Popstand
Oct 2019 - Jul 2020 (9 months)
Transitioned from QA to development, authored Detox end-to-end automation scripts that reduced manual regression testing time by 50% and improved release reliability.
Jr Mobile Developer
LeadDell
May 2018 - Jul 2019 (1 year 2 months)
Contributed to enterprise mobile applications for factory operations and performed vulnerability assessments as a security analyst to improve application hardening.
Education
Degrees, certifications, and relevant coursework
Unichristus
Postgraduate Studies, Information Security
2017 - 2018
Postgraduate studies with emphasis on information security and secure mobile application practices.
Universidade Estácio de Sá
Systems Analyst, Systems Analysis
2014 - 2016
Completed a Systems Analysis and Development program focusing on analysis and systems development.
Availability
Location
BrazilAuthorized to work in
Job categories
Skills
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