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I’m Marek Kwinta, a Senior FullStack Engineer focused on mobile and cross-platform app development across Android, iOS, and React Native. With 9 years of experience, I’ve shipped scalable, high-performance consumer apps used by hundreds of thousands of users in production. I specialize in native Android (Java, Kotlin), native iOS (Swift, Objective-C), and cross-platform frameworks like React Native and Flutter, with strong backend integration, offline persistence, and CI/CD automation. I enjoy collaborating with distributed teams, leading mobile initiatives end-to-end, and translating product requirements into reliable, maintainable mobile solutions for fast-growing digital businesses.…I’m Marek Kwinta, a Senior FullStack Engineer focused on mobile and cross-platform app development across Android, iOS, and React Native. With 9 years of experience, I’ve shipped scalable, high-performance consumer apps used by hundreds of thousands of users in production. I specialize in native Android (Java, Kotlin), native iOS (Swift, Objective-C), and cross-platform frameworks like React Native and Flutter, with strong backend integration, offline persistence, and CI/CD automation. I enjoy collaborating with distributed teams, leading mobile initiatives end-to-end, and translating product requirements into reliable, maintainable mobile solutions for fast-growing digital businesses.

Marek Kwinta

Full Stack Developer, Web Developer, Front-End Developer, +2

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I’m Marek Kwinta, a Senior FullStack Engineer focused on mobile and cross-platform app development across Android, iOS, and React Native. With 9 years of experience, I’ve shipped scalable, high-performance consumer apps used by hundreds of thousands of users in production. I specialize in native Android (Java, Kotlin), native iOS (Swift, Objective-C), and cross-platform frameworks like React Native and Flutter, with strong backend integration, offline persistence, and CI/CD automation. I enjoy collaborating with distributed teams, leading mobile initiatives end-to-end, and translating product requirements into reliable, maintainable mobile solutions for fast-growing digital businesses.…I’m Marek Kwinta, a Senior FullStack Engineer focused on mobile and cross-platform app development across Android, iOS, and React Native. With 9 years of experience, I’ve shipped scalable, high-performance consumer apps used by hundreds of thousands of users in production. I specialize in native Android (Java, Kotlin), native iOS (Swift, Objective-C), and cross-platform frameworks like React Native and Flutter, with strong backend integration, offline persistence, and CI/CD automation. I enjoy collaborating with distributed teams, leading mobile initiatives end-to-end, and translating product requirements into reliable, maintainable mobile solutions for fast-growing digital businesses.

Available to hire

I’m Marek Kwinta, a Senior FullStack Engineer focused on mobile and cross-platform app development across Android, iOS, and React Native. With 9 years of experience, I’ve shipped scalable, high-performance consumer apps used by hundreds of thousands of users in production.

I specialize in native Android (Java, Kotlin), native iOS (Swift, Objective-C), and cross-platform frameworks like React Native and Flutter, with strong backend integration, offline persistence, and CI/CD automation. I enjoy collaborating with distributed teams, leading mobile initiatives end-to-end, and translating product requirements into reliable, maintainable mobile solutions for fast-growing digital businesses.

Skills

Experience Level

Expert

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Language

Javanese

Advanced

Work Experience

Senior Mobile Engineer | Cross-Platform Mobile Architect at BGO Software

March 1, 2024 - Present

Led the end-to-end development of scalable Android and iOS applications using React Native and Flutter, accelerating feature delivery cycles by 30% across multiple consumer-facing products. Architected reusable mobile components and shared business logic in React Native, reducing duplicate platform-specific codebases by over 40%. Implemented native iOS features using Objective-C and Swift for performance-critical modules, improving app launch time by 18%. Designed robust local data persistence layers using Room and Realm Database, ensuring offline-first functionality and improving data sync reliability by 25%. Integrated RESTful APIs and real-time data streams, optimizing network performance and reducing API error rates by 20%. Established GitHub-based workflows with code reviews and branching strategies, increasing overall code quality and reducing production bugs by 35%.

React Native Developer | Mobile Application Specialist at TECHTIQ Solutions

July 1, 2021 - December 1, 2023

Developed and maintained large-scale React Native applications serving tens of thousands of active users across Android and iOS platforms. Built complex UI components using JavaScript and TypeScript, improving user engagement metrics by 22%.Integrated third-party SDKs, analytics, and payment gateways, enabling new monetization features and increasing in-app revenue. Refactored legacy React Native codebases to modern architecture patterns, reducing technical debt and improving maintainability. Implemented state management solutions and optimized rendering performance, decreasing average screen load times by 25%. Automated build and release pipelines for mobile apps, shortening release cycles and minimizing manual deployment errors. Collaborated with backend teams to define API contracts and ensure seamless mobile-backend integration. Conducted comprehensive testing and debugging across multiple device types and OS versions.

iOS Developer | Native iOS Engineer at TECHTIQ Solutions

January 1, 2021 - July 1, 2022

Designed and implemented native iOS applications using Swift and Objective-C, adhering to Apple Human Interface Guidelines. Built modular, testable iOS architectures, improving long-term scalability and reducing regression issues. Integrated REST APIs and local persistence layers to support offline usage and seamless data synchronization. Optimized UI performance and memory management, resulting in smoother animations and lower crash rates. Collaborated with QA teams to identify and resolve platform-specific issues prior to App Store submissions. Managed App Store deployments, certificates, and provisioning profiles for multiple iOS applications. Worked closely with designers to deliver responsive, high-quality mobile user experiences. Maintained legacy Objective-C codebases while incrementally modernizing them with Swift. Participated in code reviews and knowledge-sharing sessions to raise overall iOS engineering standards. Supported feature rollouts and post-release monitoring using

Mobile Developer | Android & iOS Engineer at TECHTIQ Solutions

June 1, 2019 - January 1, 2021

Developed Android applications using Java and Kotlin, focusing on performance, security, and maintainability. Implemented cross-platform features using React Native to accelerate development timelines. Designed local data storage solutions and background synchronization for mobile applications. Integrated third-party services, push notifications, and analytics tools across platforms. Collaborated with backend engineers to ensure reliable API consumption and error handling. Improved application stability through systematic debugging and performance profiling. Contributed to UI/UX improvements that increased user retention and session duration. Maintained CI workflows for Android builds and testing processes. Assisted in mentoring junior developers and onboarding new team members. Supported production releases and ongoing application maintenance.

Junior Mobile Developer | Android Developer at One X Tech

April 1, 2015 - April 1, 2019

Built and maintained Android applications using Java and the Android SDK for consumer-focused products. Implemented UI components, navigation flows, and background services following best practices. Integrated RESTful APIs and handled JSON-based data exchange. Assisted in migrating legacy code to more modern Android architectures. Fixed bugs and performance issues reported by QA and end users. Collaborated with senior developers to deliver features on time and within scope. Participated in agile ceremonies and contributed to sprint deliverables. Gained hands-on experience with version control using Git. Supported app publishing processes on Google Play Store. Developed a strong foundation in mobile development principles and lifecycle management.