I am a seasoned mobile developer with 10+ years of experience building scalable and maintainable apps using Flutter, Kotlin, and Java. I specialize in cross-platform and native Android development, applying Clean Architecture and MVVM to deliver high‑performing experiences for users. I have a proven track record of integrating REST/GraphQL APIs, Firebase, and cloud messaging, optimizing app load times and stability, and mentoring teams to adopt best practices. I enjoy shaping mobile architectures for long‑term growth across EdTech, FinTech, Healthcare, and E‑Commerce.

Raja Kumar

I am a seasoned mobile developer with 10+ years of experience building scalable and maintainable apps using Flutter, Kotlin, and Java. I specialize in cross-platform and native Android development, applying Clean Architecture and MVVM to deliver high‑performing experiences for users. I have a proven track record of integrating REST/GraphQL APIs, Firebase, and cloud messaging, optimizing app load times and stability, and mentoring teams to adopt best practices. I enjoy shaping mobile architectures for long‑term growth across EdTech, FinTech, Healthcare, and E‑Commerce.

Available to hire

I am a seasoned mobile developer with 10+ years of experience building scalable and maintainable apps using Flutter, Kotlin, and Java. I specialize in cross-platform and native Android development, applying Clean Architecture and MVVM to deliver high‑performing experiences for users.

I have a proven track record of integrating REST/GraphQL APIs, Firebase, and cloud messaging, optimizing app load times and stability, and mentoring teams to adopt best practices. I enjoy shaping mobile architectures for long‑term growth across EdTech, FinTech, Healthcare, and E‑Commerce.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate

Work Experience

Associate Staff Engineer at Nagarro
September 1, 2021 - Present
Leading development of high-impact mobile projects in Flutter and Kotlin across domains such as e-commerce, fintech, and ed-tech. Delivered core shopping modules, improved app stability reducing crash reports by 30%, integrated state management with Bloc/Provider, and implemented Clean & Modular Architecture. Achieved 84% unit test coverage, optimized app performance cutting load times drastically, and improved crash-free rates from 85% to 95%. Contributed to feature enhancements including multilingual support, smart learning practices, and RFP documentation.
Lead Android Consultant (Freelance Developer) at CoreMobile Inc.
September 1, 2021 - August 21, 2025
Implemented MVVM architecture enhancing modularity and efficiency of Android healthcare applications. Developed theft control and patient tracking systems using Bluetooth Low Energy technology. Maintained and optimized legacy codebases to improve performance and stability, increasing crash-free session rates from 48% to 85%.
Team Lead at Kent RO Systems
January 31, 2020 - August 21, 2025
Led the Android development team and designed core application functionalities in MVVM architecture. Enhanced code modularity and maintainability while integrating CI/CD pipelines to streamline software development lifecycle, improving code reviews, workflows, and release management.
Senior Software Developer at Retech Labs
October 31, 2019 - August 21, 2025
Developed and led B2B e-commerce Android application for stock management with offline support. Applied MVP architecture and refactored legacy code to reduce technical debt. Integrated Realm database enabling offline-first workflows with increased stability and achieved 100% crash-free sessions.
Senior Programmer at Uninstall.io (Capience Technology Pvt. Ltd.)
September 30, 2015 - August 21, 2025
Developed India’s first Uninstall Prediction Android Analytic SDK and contributed heavily to location-based advertising SDKs utilizing Geofence, Beacon technology, and location data. These platforms were adopted by prominent e-commerce companies and accelerated by Microsoft Ventures.
Freelance Developer
July 31, 2014 - August 21, 2025
Developed India's pioneering finance management application 'Prospr' and event management applications integrating Facebook APIs. Leveraged Parse cloud platforms to enable real-time database functionalities enhancing user engagement.
Application Developer at Divum Corporate Service Pvt. Ltd.
April 30, 2014 - August 21, 2025
Developed more than 7 Android applications with high performance and seamless user experience including widely downloaded consumer apps like Aaj-tak and Cricket Live Score. Integrated social media for enhanced user engagement, implemented Firebase Cloud Messaging for real-time notifications, significantly improving user retention.
Associate Staff Engineer at Nagarro
September 1, 2021 - Present
Led Flutter and Kotlin mobile projects across e-commerce, fintech, and ed-tech domains, delivering stable, high-performance apps. Built core shopping module for Extra with Bloc/Provider state management, modular architecture, API integrations (Dio/HTTP), localization, and widget testing. Implemented secure authentication and data encryption, reducing crash reports.
Mobile Banking – McKinsey Project at Nagarro
September 1, 2021 - Present
Led unit test development and bug fixes to improve app reliability. Used GitHub Copilot for rapid prototyping and automated test case generation; achieved 84% test coverage. Implemented MVVM with Clean Architecture, Data Binding, and Hilt to improve modularity.
Lead Android Consultant (Freelance) at CoreMobile Inc
September 1, 2021 - September 16, 2025
Implemented MVVM architecture, enhancing modularity and development efficiency. Maintained and optimized legacy codebases, ensuring stability and compliance with Android standards. Developed a BLE-enabled theft control and COVID-19 patient tracking system.
Team Lead at Kent RO Systems
January 1, 2020 - September 16, 2025
Led Android development team, designed core application functionalities, and maintained a clean, scalable, high-performance codebase. Implemented MVVM architecture, improved modularity, testing, and streamlined CI/CD automation.
Senior Software Developer at Retech Labs
October 1, 2019 - September 16, 2025
Developed a B2B e-commerce Android app with offline-first support. Implemented MVP architecture, refactored legacy code, and integrated Realm DB for offline workflows to enhance stability and performance.
Senior Programmer at Uninstall.io
September 1, 2015 - September 16, 2025
Developed India’s first uninstall-prediction Android analytics SDK and contributed to an intelligent geofence/location-based beacon advertising SDK, adopted by major e-commerce players.
Freelance Developer at Freelance
July 1, 2014 - September 16, 2025
Developed Prospr, a finance management app for cash flow tracking and insights; built event management app leveraging Facebook APIs; integrated Parse for real-time data synchronization.
Application Developer at Divum Corporate Service Pvt. Ltd.
April 1, 2014 - September 16, 2025
Developed 7+ Android applications with a focus on performance and user experience. Implemented FCM push notifications and integrated multiple third-party libraries to enhance engagement.
Associate Staff Engineer at Nagarro
September 1, 2021 - Present
Led multiple high-impact mobile projects across e-commerce, fintech, and ed-tech domains, delivering Flutter & Kotlin apps with improved stability, performance, and user experience. Key contributions included building core shopping modules (e.g., Extra - E-commerce), implementing Bloc/Provider state management, applying Clean & Modular Architecture, API integrations with Dio/HTTP, localization with Intl, and widget testing for robust UI validation. Drove secure authentication and data encryption, reducing crash reports by 30%.
Lead Android Consultant (Freelance Developer - CoreMobile Inc) at CoreMobile Inc
September 1, 2021 - September 16, 2025
Implemented MVVM architecture with Clean Architecture, modularization, and modern dependency management. Maintained and optimized legacy Android codebases, developed BLE-based theft control and COVID patient-tracking systems, and ensured stability, performance, and compliance with Android standards. Improved app stability and reliability during tenure.
Team Lead at Kent RO Systems
January 1, 2020 - September 16, 2025
Led the Android development team, ensured cross-functional collaboration, and delivered core features with clean, scalable, high‑performing code. Implemented MVVM, improved modularity, and integrated CI/CD automation to streamline release management and quality assurance.
Senior Software Developer at Retech Labs
October 1, 2019 - September 16, 2025
Developed a B2B e-commerce Android app for stock management with offline-first capabilities using Realm DB. Implemented MVP architecture, refactored legacy code to improve maintainability, and reduced technical debt, resulting in more stable releases and better performance.
Senior Programmer at Uninstall.io
September 1, 2015 - September 16, 2025
Developed India’s first uninstall prediction Android analytics SDK and contributed to intelligent location-based advertising SDKs using Geofence and Beacon technology. These SDKs were adopted by major e-commerce and mobile product companies and gaining recognition within the industry.
Freelance Developer at Self-employed
July 1, 2014 - September 16, 2025
Created finance management app Prospr to track cash flow with insights into income, expenses, and savings goals; developed event management app leveraging Facebook APIs; integrated Parse for real-time data synchronization to boost user engagement.
Application Developer at Divum Corporate Service Pvt. Ltd.
April 1, 2014 - September 16, 2025
Developed more than 7 Android applications for clients, including high-performance consumer apps like Aaj-tak and Cricket Live Score. Integrated Firebase Cloud Messaging (FCM) and various third-party libraries to deliver real-time push notifications, enhancing user retention and engagement.

Education

BE (Computer Science) at Annamalai University
January 1, 2008 - January 1, 2012
XIIth at Bihar Board
January 11, 2030 - August 21, 2025
Xth at Bihar Board
January 11, 2030 - August 21, 2025
BE (Computer Science) at Annamalai University
January 11, 2030 - January 1, 2012
XIIth at Bihar Board
January 11, 2030 - September 16, 2025
Xth at Bihar Board
January 11, 2030 - September 16, 2025
BE (Computer Science) at Annamalai University
January 1, 2012 - September 16, 2025

Qualifications

Add your qualifications or awards here.

Industry Experience

Education, Financial Services, Healthcare, Retail, Software & Internet, Media & Entertainment