About Md Rayhan
Mobile App Developer | Flutter & Android Specialist
I help businesses build high-performance, scalable mobile applications for Android and iOS using Native technologies and Flutter. With 7 years of experience in mobile development, I focus on delivering clean, maintainable code and seamless user experiences.
What I Offer:
- End-to-end development of cross-platform and native mobile apps.
- Expertise in Flutter, Dart, Kotlin, and modern Android development (Jetpack Compose, MVVM, Clean Architecture).
- Integration with RESTful APIs, Firebase, and third-party SDKs.
- Performance optimization, testing, and CI/CD setup.
- Collaboration with product, design, and backend teams.
My Added Value:
I bring a practical, results-driven approach to development, with a track record of improving app performance, reducing crashes, and accelerating release cycles. I thrive in agile, cross-functional environments and take ownership of projects from concept to deployment.
Typical Projects:
- Fintech, health tech, and e-commerce mobile apps.
- Greenfield app development and legacy app modernization.
- SDK development and API integrations.
- Custom UI/UX implementation and performance tuning.
Let’s build something impactful together.
English
Native or bilingual
German
Basic
Can work on-site
Berlin (up to 50km)
Experience
- RL TechnologiesSr. Android Application DeveloperDecember 2020 - July 2025 (4 years and 7 months)Dhaka, Bangladesh• Led development of native and cross-platform mobile apps using Kotlin, Jetpack Compose, and Flutter with clean architecture and lifecycle management.• Migrated and optimized a legacy Android app built with Java, improving performance by 30–40% through code cleanup and profiling.• Integrated apps to backend services using REST APIs and implemented Firebase (auth, database, push notifications).• Optimized performance issues, reducing crashes by 30% and making screens load faster.• Implemented MVVM architecture across 7 core modules, increasing code testability and maintainability by 40%.• Collaborated with designers, backend developers and testers to improve features and fix problems.• Set up CI/CD pipelines with Jenkins, Codemagic, and Bitrise, reducing manual deployment time by 80%.• Added automated tests that caught bugs earlier, reducing user reports by 25%.
- Dana FintechSr. Android Application DeveloperJune 2020 - March 2022 (1 year and 9 months)Dhaka, Bangladesh• Developed a fintech android app with kotlin for a startup, reaching 10K+ users after launch..• Also designed and published an SDK to jitpack.io.• Refactored SDK codebase, removing 30% redundant code to boost performance and maintainability.
- Parallaxlogic InfotechAndroid DeveloperNovember 2016 - November 2020 (4 years)Dhaka, Bangladesh• Led development of 15+ Android applications utilizing Java and Kotlin, ensuring high-quality code and seamless userexperiences.• Pioneered the creation of 3 successful Flutter apps.• Integrated 2C2P, Alipay, Paytabs, and SSLCommerz payment SDKs across 3+ projects, enhancing multi-region payment support and reducing integration issues by 30%.• Analyzed performance quality and responsiveness 100% of application.
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Education
- B.Sc. in ComputerAmerican International University-Bangladesh (AIUB)2017B.Sc. in Computer