Senior Mobile Developer with Cross-Platform Expertise

Martin Chavez

Lead Mobile Developer

****************@*****.*** +1-201-***-**** Florence, AZ

SUMMARY

Dynamic and results-driven Senior Mobile Application Developer with over 8 years of experience delivering high- impact iOS and Android applications. Proficient in both cross-platform (React Native, Flutter) and native development (Swift, Kotlin), with strong expertise in scalable architecture patterns like MVVM and BLOC. Adept at building intuitive, user-centric interfaces that align with performance, accessibility, and modern design principles. Proven ability to lead Agile teams, mentor developers, and translate complex business needs into robust mobile solutions. Passionate about optimizing app performance and collaborating closely with product, design, and engineering teams to deliver polished, user-focused applications from concept to launch. TECHNICAL SKILLS

Languages & Platforms

Swift, Objective-C, Kotlin, Java, Dart,

JavaScript/TypeScript

Performance & Monitoring

Instruments, Android Profiler, Crashlytics, Firebase Analytics

Testing & CI/CD

XCTest/XCUI, JUnit/Espresso, Fastlane, GitHub

Actions, Bitrise

Backend & APIs

RESTful & GraphQL integration, WebSockets, Firebase, Core Data, Realm, Room, SQLite

Frameworks & Architectures

SwiftUI & UIKit, Jetpack Compose & Android SDK,

Flutter, React Native, MVVM/MVP/MVI, Redux

Collaboration & Methodologies

Agile/Scrum, code reviews, pair programming,

mentorship

PROFESSIONAL EXPERIENCE

Lead Mobile Developer, Tech Holding

•Spearhead end-to-end mobile development for flagship iOS and Android apps, driving a 30% uplift in DAU through feature innovation and UX refinements.

•Architect cross-platform solutions with Flutter and React Native, enabling 80% code sharing and accelerating time-to-market by 50%.

06/2022 – Present

•Mentor a team of 6 developers, conducting regular code reviews, pairing sessions, and brown-bag workshops on state management (Bloc, Redux) and platform conventions.

•Implement MVVM with Combine and Coroutines to ensure modular, testable code; achieved 90% unit coverage across new feature modules.

•Champion CI/CD adoption via GitHub Actions and Fastlane, reducing release cycle time from bi-weekly to daily deployments.

•Collaborated with product design and analytics teams to A/B test UI flows, increasing user retention by 15%.

•Launched accessibility improvements (WCAG compliance), boosting app usability for an additional 10% of users.

Senior Mobile Developer, Conquerors Software Technologies

•Led development of an EV-charger discovery app using Kotlin and Swift, integrating Google Maps SDK and real-time location services to boost charger accuracy by 25%.

•Optimized app performance through memory profiling and asynchronous data loading, cutting screen-render latency by 20%.

05/2020 – 05/2022

•Collaborated with backend engineers to design RESTful endpoints with Retrofit/Moshi and Alamofire, ensuring robust offline caching and synchronized state.

•Wrote comprehensive unit and UI tests (JUnit, Espresso, XCTest), maintaining stability during rapid feature sprints.

•Integrated push notifications and deep linking strategies, increasing re- engagement rates by 18%.

•Partnered with QA to establish automated end-to-end testing pipelines, reducing regression bugs by 35%.

Mobile Developer, Chestnut Hill Technologies

•Developed cross-platform React Native modules for internal talent management tools, standardizing UI components and improving development velocity by 0%.

•Integrated Firebase services for real-time analytics, crash reporting, and authentication, enhancing app reliability and monitoring. 03/2019 – 05/2020

•Presented proposals for Jetpack Component adoption (LiveData, ViewModel), laying groundwork for modern Android architecture migration.

•Participated in all Agile ceremonies, ensuring alignment on priorities and delivering incremental value in two-week sprints

Junior Mobile Developer, Astrosoft Technologies

•Contributed to Android and iOS app development using Cordova and early versions of React Native, gaining experience in hybrid app architecture

•Used Android Studio and Xcode for platform-specific debugging and testing. 07/2017 – 03/2019

•Implemented basic UI/UX using XML layouts (Android) and Flexbox (React Native), following early Material Design and iOS Human Interface guidelines.

•Gained foundational experience with version control using Git, and worked in a Waterfall-to-Agile transitioning team environment. EDUCATION

Bachelor of Science in Computer Science, University of Arizona

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