r
rayhanpm12

Rayhanul Islam

@rayhanpm12

Production Mobile Engineer

Bangladesh
English
About me
Senior Flutter Engineer with 5+ years of experience building production-ready Android & iOS apps from idea to launch. I specialize in Flutter, Dart, clean architecture, APIs, Firebase, payments, real-time features, crypto wallets, blockchain/Web3, AI, Neural TTS, Bluetooth/device synchronization, ARKit, ARCore, background location, and native integrations. I’ve built products across fintech, healthcare, social, logistics, ERP, and location-based platforms, focusing on clean code, smooth UX, performance, and scalable solutions.... Read more

Skills

r
rayhanpm12
Rayhanul Islam
Offline • 

See my services

Cross-Platform Development
I will create white label flutter apps with flavors
From$100 / projectMore details

Portfolio

Work experience

Pakiza_Software Ltd

Senior Software Engineer (Assistant Manager)

Pakiza Software Ltd • Full-time

May 2022 - Present • 4 yrs 5 mos

Senior Software Engineer (Assistant Manager) As a Senior Software Engineer, I was responsible for designing, developing, and delivering complex mobile products using Flutter for Android and iOS. I worked across the full product lifecycle, from technical planning and architecture to development, testing, optimization, and production release. Key Responsibilities • Designed scalable application architecture and established development patterns for large Flutter applications. • Developed high-quality, reusable, and responsive UI components with a strong focus on performance and user experience. • Integrated REST APIs, Firebase, authentication, payments, analytics, push notifications, and real-time services. • Built complex LMS solutions integrating Moodle, WordPress, SCORM, WebView, and JavaScript-to-Dart communication. • Developed large-scale social platform features including feeds, stories, posts, reactions, comments, profiles, groups, live streaming, video calling, and real-time communication. • Implemented crypto wallets and Web3/blockchain functionality, including MetaMask integration, transaction handling, and gas-price management. • Developed marketplace, balance management, campaign, CPC advertising, top-up, and transfer workflows. • Worked with native Android/iOS capabilities, third-party SDKs, background processing, local storage, advanced animations, and performance optimization. • Reviewed code, mentored engineers, established coding standards, and contributed to architectural and technical decisions. • Developed custom Flutter linting and static-analysis rules to improve code quality and consistency. • Investigated complex technical problems, optimized application performance, resolved production issues, and supported app releases and deployments. Core Specializations Flutter • Dart • Android • iOS • Clean Architecture • Firebase • REST APIs • Fintech • Payments • Web3 • Blockchain • Crypto Wallets • MetaMask • Social Media • Real-time Communication •