Abu Sayed
Abu Sayed Chowdhury
Senior Software Specialist @SSL Wireless
6+ years of Flutter expertise • 20+ successful mobile apps • Fintech • AI Automation
20+
Apps Delivered
6+
Years Experience
200K+
Users Served
15+
Team Members Mentored
About Me
Senior Flutter Developer with 6+ years of experience building scalable, high-performance mobile apps. I have successfully delivered 20+ applications in fintech, e-commerce, and enterprise domains, helping businesses launch secure, user-friendly, and growth-oriented digital products.
My expertise includes Flutter & Dart advanced concepts, state management (BLoC, Riverpod, GetX), fintech solutions with secure payment integrations, and AI automation using Google ADK, n8n, and MCP. Beyond coding, I enjoy mentoring developers and fostering a positive, collaborative team culture.
Dhaka, Bangladesh
Available for opportunities
20+
Apps Delivered
6+
Years Experience
200K+
Users Served
15+
Team Members Mentored
Professional Experience
Senior Software Specialist
SSL Wireless
Feb 2025 – Present
Dhaka, Bangladesh
- Designed and implemented Flutter applications following Clean Architecture principles with a feature-layered pattern for scalable and maintainable code.
- Integrated Dependency Injection (DI) for improved modularity and testability across all projects.
- Established a Clean Architecture structure with automated module generation using SSL_CLI.
- Led AI adaptation initiatives, conducting training sessions and workshops on AI integration for 300+ colleagues.
- Developed automation tools using Python, including the SSLLog CLI, to streamline internal workflows.
- Gained hands-on experience with Google ADK, n8n, and MCP, enhancing automation and integration capabilities across projects.
Software Specialist
SSL Wireless
Jan 2023 – Feb 2025
Dhaka, Bangladesh
- Led development of 15+ Flutter applications with 100% on-time delivery and zero critical bugs in production.
- Architected scalable mobile solutions serving 200K+ users across Android and iOS platforms.
- Experienced in integrating Flutter modules with existing Android and iOS apps.
- Proficient in working with REST API and GraphQL to develop robust applications.
- Guided team members to learn Flutter and improve their skills, mentoring 15+ developers.
- Developed banking apps, payment gateways, and enterprise solutions ensuring high-quality code and performance.
Associate Software Engineer
SSL Wireless
May 2021 – Feb 2023
Dhaka, Bangladesh
- Created the country's most well-known SSLCommerz payment gateway SDK for Flutter.
- Built a custom Flutter architecture structure to develop high-level, multi-module apps.
- Created CLI apps (SSL_CLI) to generate Flutter structure and pre-generated code.
- Worked with pair programmers to create product, project, and service-based apps.
- Worked with GraphQL to create successful e-commerce applications.
Software Engineer
Advanced Apps Bangladesh
Nov 2020 – May 2021
Dhaka, Bangladesh
- Implemented the Model-View-Controller (MVC) pattern using GetX for optimized app structure and maintainability.
- Integrated various Firebase services including database, storage, Crashlytics, Analytics, and push notifications for Android and iOS.
- Utilized custom painters with animation to create engaging user interfaces and enhanced user experience.
- Built dynamic and responsive interfaces using animation and animated widgets, improving overall aesthetic and usability.
Mobile Application Developer
Ringersoft Limited
Mar 2020 – Nov 2020
Chittagong, Bangladesh
- Developed school management and e-commerce apps, ensuring efficient functionality and user experience.
- Successfully developed an e-commerce app using Flutter and Provider state management within a tight 15-day schedule.
- Proficient in Android Studio and Java, building robust and efficient applications with optimized code.
- Deployed apps on Play Store, ensuring proper app store guidelines are met and apps are easily accessible.
Featured Projects
Autosafe_json
Open Source2025
Dart package that prevents app crashes caused by complex or inconsistent JSON responses. Confidently handle any backend response — lists, maps, nulls, or type mismatches — without extra code.
Zero-crash JSON handling
DartJSON ParsingFlutter Plugin
View ProjectSumo Restaurants
Enterprise2025
Restaurant ordering app with SQLite-based offline support, cash point integration, gift cards, and seamless food ordering experience.
Streamlined restaurant operations
FlutterSQLiteGift CardsPOS
View ProjectOthership Workplace Scheduler
Enterprise2023
Enterprise-grade booking and scheduling platform for meeting rooms, desks, and workspaces with real-time availability.
Improved workspace utilization by 40%
FlutterRiverpodREST APIFirebase
View ProjectOthership Visitor Management
Enterprise2024
Comprehensive and customizable visitor management solution that simplifies visitor check-ins and enhances security.
Streamlined visitor management
FlutterBlocKIOSKReal-time
View ProjectOthership Room Display
Enterprise2024
KIOSK application developed with Bloc for managing meeting room schedules and display systems on tablets and iPads.
Streamlined room management
FlutterFlutter BlocKIOSKiPad
View ProjectmyBKB app
FinTech2025
Secure mobile banking application with biometric authentication, transaction history, and seamless API integration.
Processed $1M+ in transactions
FlutterFirebaseAPI Integration
View ProjectDisaster Alert for BD
Utility2024
Automates disaster management — weather updates, early warnings, shelter landmarks, fire services, medical service, emergency camps, and emergency SMS to relatives.
Real-time disaster alerts for BD
SwiftUICoreDataAPI Integration
View ProjectBDTax
Government2024
Online tax filing service allowing users to upload tax documents, with consultant-prepared returns and acknowledgment slips via email and courier.
Served 50K+ taxpayers
FlutterGovernment APIPDF Generation
View ProjectBDHonda+
Utility2024
All-in-one platform for Bangladeshi Honda bikers — nearby dealers, maintenance guidelines, spare parts info, and safety rules.
Enhanced biker experience
FlutterFirebaseAPI Integration
View ProjectBASIC Bank App (Magpie)
FinTech2023
Secure mobile banking application with biometric authentication, transaction history, and seamless API integration.
Processed $2M+ in transactions
FlutterSecurityREST APIBiometrics
View ProjectBiometric Callback
Open Source2023
Open-source Flutter package for handling biometric authentication callbacks across Android and iOS platforms.
Simplified biometric auth flow
DartFlutterBiometrics
View ProjectDesco Utility App
Utility2022
Utility service application for electricity bill payments, account management, and usage tracking.
20K+ downloads
FlutterRiverpodPayment Integration
View ProjectEcosuponno
E-Commerce2023
E-commerce application built with GraphQL and GetX for a seamless online shopping experience.
Full e-commerce platform
FlutterGraphQLGetX
View ProjectAkij Cement CRM
Enterprise2022
CRM application with polished UI, enhancing client interactions and productivity for Akij Cement.
Enhanced client productivity
FlutterGetXCRMUI/UX
View ProjectFlutter_sslcommerz
Open Source2021
Open-source Flutter payment gateway SDK published on pub.dev, enabling secure SSLCommerz payment processing for Android and iOS.
500+ pub.dev downloads
FlutterDartPayment GatewayDart Package
View ProjectSSL_CLI
DevTools2021
Command-line tool for automating Flutter project setup, module generation, and APK delivery via Telegram bot.
Reduced setup time by 70%
DartCLIAutomationTelegram Bot
View ProjectPay By Link (PBL)
FinTech2023
Seamless payment link generation and processing app built with Riverpod state management.
Simplified payment flows
FlutterRiverpodPayment Integration
View ProjectBOnline for Merchants
FinTech2022
Merchant management app enabling live transaction tracking, order management, and customer insights.
Enhanced merchant experience
FlutterRiverpodAnalytics
View ProjectB71
E-Commerce2021
E-commerce application built with GraphQL and GetX for the B71 cricket brand, associated with SSL Wireless.
Full e-commerce platform
FlutterGraphQLGetX
Rebella (ARFace App)
AR/VR2022
Augmented reality-based face detection application for Android and iOS platforms.
Innovative AR experience
FlutterARFace DetectionCamera
View ProjectEmployee Buddy
Enterprise2021
Employee management application available on Android and iOS to enhance team collaboration.
Enhanced team collaboration
FlutterRiverpodTeam Management
View ProjectRukon
Enterprise2021
Client-based Flutter application built with GetX state management, associated with SSL Wireless.
Delivered on schedule
FlutterGetXREST API
Sohooze Kinun
E-Commerce2020
E-commerce app developed using Flutter with Provider state management during early career at Ringersoft Limited.
Published on Play Store
FlutterProviderE-Commerce
View ProjectTechnical Expertise
Frameworks
FlutterSwiftUIMERN
Programming Languages
DartJavaScriptSwiftKotlinPython
State Management
RiverpodBLoCGetXProvider
Backend & APIs
REST APIGraphQLFirebaseExpress.jsNode.js
Databases
MongoDBSQLiteHiveFirebaseObjectBoxCoreData
CI/CD & DevOps
JenkinsGitHub ActionsBitbucket PipelinesCodemagic
Familiar
Google ADKn8nMCPv0NoteBookLMGamma
AI IDE & Tools
Claude DesktopClaude CodeGoogle AntigravityWindsurfCursor
Certifications & Education
Education
M.Sc. in Computer Science
Jahangirnagar University, Bangladesh
2020 – 2022CGPA: 3.63/4.0
B.Sc. in Computer Science
Bangladesh Army International University of Science and Technology
2016 – 2020CGPA: 3.87/4.0
Professional Certifications
Claude Code in Action
Anthropic
April 2026Verified
View CertificateIntroduction to Agent Skills
Anthropic
April 2026Verified
View CertificateClaude 101
Anthropic
April 2026Verified
View CertificateIntroduction to Claude Cowork
Anthropic
April 2026Verified
View CertificateIntroduction to Subagents
Anthropic
April 2026Verified
View CertificateUnit 1: Foundations of Agents
Hugging Face
March 2025Verified
View CertificateBuild Apps with Windsurf’s AI Coding Agents!
DeepLearning.AI
March 2025Verified
View CertificateIntroduction to iOS Mobile Application Development
Meta
March 2024Verified
View CertificateFoundation of Cybersecurity
Google
November 2023Verified
View CertificateIntroduction to Flutter Development Using Dart
The App Brewery
May 2020Verified
View CertificateComplete Android App Development Masterclass In Bangla
MSB Academy
April 2020Verified
View CertificateNeural Networks and Deep Learning
Coursera
December 2019Verified
View CertificateSequence Models
Coursera
November 2019Verified
View CertificateNatural Language Processing in TensorFlow
Coursera
October 2019Verified
View CertificateLet's Build Something Amazing Together
Ready to bring your mobile app vision to life? I'm passionate about creating exceptional Flutter applications that deliver real value to users. Let's discuss your project!