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Senior Mobile Engineer and Mobile Tech Lead with 8+ years of experience specializing in React Native and cross-platform mobile development (iOS & Android). I lead mobile architecture, offline-first systems, performance optimization, native iOS integrations, app security, and end-to-end delivery. I’ve led teams, relaunched products that were blocked for years, and shipped greenfield enterprise apps while partnering closely with founders, executives, product/design teams, and backend engineers in distributed international environments.…Senior Mobile Engineer and Mobile Tech Lead with 8+ years of experience specializing in React Native and cross-platform mobile development (iOS & Android). I lead mobile architecture, offline-first systems, performance optimization, native iOS integrations, app security, and end-to-end delivery. I’ve led teams, relaunched products that were blocked for years, and shipped greenfield enterprise apps while partnering closely with founders, executives, product/design teams, and backend engineers in distributed international environments.

Matheus Casavechia

Software Engineer, Full Stack Developer, App Developer, +2

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Senior Mobile Engineer and Mobile Tech Lead with 8+ years of experience specializing in React Native and cross-platform mobile development (iOS & Android). I lead mobile architecture, offline-first systems, performance optimization, native iOS integrations, app security, and end-to-end delivery. I’ve led teams, relaunched products that were blocked for years, and shipped greenfield enterprise apps while partnering closely with founders, executives, product/design teams, and backend engineers in distributed international environments.…Senior Mobile Engineer and Mobile Tech Lead with 8+ years of experience specializing in React Native and cross-platform mobile development (iOS & Android). I lead mobile architecture, offline-first systems, performance optimization, native iOS integrations, app security, and end-to-end delivery. I’ve led teams, relaunched products that were blocked for years, and shipped greenfield enterprise apps while partnering closely with founders, executives, product/design teams, and backend engineers in distributed international environments.

Available to hire

Senior Mobile Engineer and Mobile Tech Lead with 8+ years of experience specializing in React Native and cross-platform mobile development (iOS & Android). I lead mobile architecture, offline-first systems, performance optimization, native iOS integrations, app security, and end-to-end delivery.

I’ve led teams, relaunched products that were blocked for years, and shipped greenfield enterprise apps while partnering closely with founders, executives, product/design teams, and backend engineers in distributed international environments.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Portuguese

Fluent

English

Fluent

Spanish; Castilian

Intermediate

Work Experience

Senior Mobile Engineer at SOMEWHERE

March 1, 2025 - May 31, 2026

Owned the architecture and technical direction of multiple React Native applications across iOS and Android, including application security, accessibility, releases, and production monitoring. Partnered directly with the CEO, CTO, product, design, and backend teams to translate business objectives into scalable product and engineering solutions. Reduced feature implementation time by ~50% through reusable architecture patterns, shared components, and standardized engineering practices. Improved mobile performance across critical flows by ~30% by reducing unnecessary renders, optimizing API requests, restructuring state management, and monitoring production performance. Delivered Stripe payments, CometChat real-time communication, deep linking, and analytics via Mixpanel Session Replay. Owned iOS and Android releases via Expo EAS, TestFlight, App Store Connect, and Google Play Console.

Senior Mobile Engineer at UPSTART 13

August 1, 2024 - March 31, 2025

Recovered and stabilized a mobile application that had been unable to reach production for nearly two years by resolving critical architecture, application security, performance, integration, and app lifecycle blockers. Led the migration of a legacy native application to a React Native-based architecture to improve maintainability, cross-platform development, and feature delivery speed. Reduced initial data loading time from over 60 seconds to under 30 seconds by addressing backend integration, synchronization, and local data bottlenecks. Maintained and extended native iOS functionality in Objective-C while delivering React Native features and backend-for-frontend services using GraphQL and Apollo Client. Owned full iOS and Android lifecycle through TestFlight, App Store Connect, and Google Play Console including release planning, validation, deployment, monitoring, and production support.

Mobile Tech Lead at DEAL

January 1, 2023 - August 31, 2024

Architected, built, and launched a greenfield enterprise React Native application, defining its technical architecture, engineering standards, testing strategy, and release process. Led a team of four mobile engineers with technical direction, mentoring, code reviews, sprint planning, delivery coordination, and hands-on support during production releases. Designed an offline-first architecture using TypeScript, Jotai, Zustand, and WatermelonDB for reliable field operations under unstable/limited network conditions. Established mobile observability using Datadog and Firebase Crashlytics. Implemented secure Microsoft SSO authentication, enterprise deployment workflows via Microsoft Intune, and enterprise-grade application security practices.

Software Engineer at PICPAY

September 1, 2021 - January 31, 2023

Developed and scaled customer-facing investment features using React Native, TypeScript, GraphQL, Apollo Client, and backend integrations. Owned critical investment product flows across the full app lifecycle—from discovery and technical design through secure implementation, accessibility validation, testing, production release, and post-release monitoring. Helped define mobile testing architecture and reusable testing standards using Jest and React Native Testing Library. Contributed to CI/CD, code review, and release-process improvements to strengthen delivery reliability and engineering consistency.

React Native Engineer at SOMEI App

June 1, 2020 - September 30, 2021

Built and maintained customer-facing React Native features using JavaScript, Redux, REST APIs, and Axios. Integrated Mercado Pago QR code payments to enable mobile checkout and digital payment workflows for small businesses. Delivered Quick Sale and Sale on Credit features by translating business requirements into reliable checkout and sales management workflows. Implemented offline behavior and local state management strategies to improve reliability under unstable network conditions.

Front End Engineer at SAFRA

January 1, 2019 - May 31, 2020

Led frontend development of the SafraPay transaction statement experience, improving customer visibility into banking and payment activity. Contributed to the business account opening journey, enabling companies to access Safra’s digital banking services. Delivered frontend features and REST API integrations across banking, payments, account opening, and financial-account products. Served as a frontend technical reference supporting code reviews, engineering standards, and delivery best practices.