Results-driven Sr. Mobile App Developer with 3+ years of experience specializing in cross-platform application development using Flutter. Proven track record of delivering high-quality mobile solutions for diverse clients, from startups to established agencies. Expert in creating seamless user experiences across iOS and Android platforms, with strong skills in API integration, UI/UX implementation, and performance optimization. Passionate about writing clean, maintainable code and staying current with emerging mobile technologies.
My Resume
Abdullah Muhtasim Sadid
Sr. Mobile App Developer & Cross-Platform Specialist
01Summary
02Skills
Mobile Development: Flutter, Dart, Android SDK, iOS Development
Web Development: Node.js, Express.js, React.js, Full-Stack Development
Backend & APIs: RESTful APIs, Firebase, Django, API Integration
Database: Firebase Firestore, SQLite, MongoDB
Tools & Methods: Git, Version Control, UI/UX Design, ChatBot Integration
03Experience
Sr. Mobile App Developer
Sparktech Agency | Full-time
May 2025 - Present
Dhaka, Bangladesh
- Develop and maintain cross-platform mobile applications using Flutter framework, ensuring consistent performance across iOS and Android platforms
- Collaborate with UI/UX designers and backend developers to implement responsive designs and integrate RESTful APIs for seamless data flow
- Optimize application performance through code refactoring, lazy loading, and efficient state management techniques, resulting in improved app responsiveness
- Participate in code reviews and follow best practices to maintain high code quality and application security standards
- Debug and resolve technical issues, providing timely solutions to ensure smooth application functionality
Key Focus: Mobile Application Development • Android Development • Cross-Platform Development
Mobile Application Developer
Freelance
Jul 2022 - May 2025
Dhaka, Bangladesh
- Delivered custom mobile applications for 15+ clients across various industries including e-commerce, healthcare, and productivity sectors
- Designed and implemented full-stack mobile solutions from concept to deployment, managing complete project lifecycles
- Conducted client consultations to gather requirements, provide technical recommendations, and ensure alignment with business objectives
- Maintained client relationships through effective communication and timely project delivery, achieving 95% client satisfaction rate
Achievement: 15+ successful projects delivered • 95% client satisfaction rate
04Key Projects
TaskMama - Comprehensive Family Task Management App
Jul 2025 - Oct 2025 | Sparktech Agency
Created a full-featured productivity application designed to help busy parents and professionals manage daily routines, family schedules, and household tasks efficiently.
- Architected and implemented complete task management system with priority levels, reminders, and deadline tracking
- Integrated calendar functionality for seamless event scheduling and family coordination
- Developed meal planning module with automated shopping list generation and recipe management
- Implemented family collaboration features enabling task assignment and progress tracking across multiple users
- Integrated LiveChat ChatBot for intelligent task suggestions and user support
- Implemented in-app purchase subscriptions for premium features and Shopify integration for business operations, shipping payment integration end-to-end on both iOS and Android
Tech Stack: Flutter • LiveChat ChatBot API • Firebase • Local Storage • In-App Purchases
Local AI Chat - LAN Client for Local LLMs
2026 | Personal Project
Built and published an Android app that acts as a LAN client for self-hosted local AI models, letting users chat with LLMs running on their own machine directly from their phone over the local network.
- Built a Flutter-based Android client for connecting to self-hosted LLM servers (Ollama, LM Studio, and more) over the local network
- Designed a no-cloud, no-account architecture — requests go directly from the phone to the LAN-hosted model, prioritizing user privacy
Tech Stack: Flutter • Android • LAN Networking • Ollama • LM Studio
Simple Notes - Offline Note-Taking App
2025 | Personal Project
Built and published an offline note-taking app that lets users create and edit notes anytime, anywhere, with all data stored securely on-device for full privacy. Recently added AI-powered notes that auto-generate a title, tags, and summary from note content, using a user-selectable AI provider connected via the user's own API key.
- Implemented unlimited note creation with folder-based organization and quick search by title or content
- Designed fully offline, local-storage architecture with no cloud dependency, prioritizing user privacy
- Added AI-powered title, tag, and summary generation with support for multiple AI providers (OpenAI, Anthropic, OpenRouter) via user-supplied, securely stored API keys
- Improved layout responsiveness across note and splash screens for a smoother experience on different screen sizes
Tech Stack: Flutter • Local Storage • Android • AI Integration (OpenAI, Anthropic, OpenRouter APIs)
Orbitron - Arcade Game
2025 | Personal Project
Built and published a fast-paced arcade game solo for Android, featuring orbit-reversal mechanics, enemy dodging, and a global leaderboard.
- Designed tap-to-reverse-orbit gameplay mechanics with progressively challenging enemy patterns and gem collection
- Implemented global leaderboard system to drive player engagement and replayability
Tech Stack: Flutter • Android
Stack Rush - Arcade Game
2025 | Personal Project
Built and published a minimalist block-stacking arcade game solo for Android, focused on precision timing and endless replayability.
- Developed core stacking mechanic with precision timing and progressively increasing difficulty
- Handled complete solo development lifecycle from concept through Play Store publishing
Tech Stack: Flutter • Android
Hotel Khan Palace - Hotel Booking Website
2025 | Freelance
Developed a hotel booking website for Hotel Khan Palace in Kuakata, showcasing luxury AC family rooms, fine dining, and a swimming pool near the beach, with online booking for guests.
- Built responsive booking website with room showcases, amenities, and online reservation functionality
- Delivered a live production site for a real hospitality client (hotelkhanpalace.com)
Tech Stack: React.js • Node.js
05Education
Bachelor's Degree
Stamford University Bangladesh
Dhaka, Bangladesh
Secondary Education
Barisal Zilla School
Barisal, Bangladesh
06Certifications
Flutter Development
Dec 2023
WsCube Tech | Credential ID: WSC02301/1501 | Verify Certificate
Flutter • Dart • State Management • UI/UX Design • API Integration
Full Stack Web Development with React and Node.js
Completed
Bangladesh University of Engineering and Technology
Node.js • Express.js • React.js • MongoDB
Claude Code 101
2025
Anthropic | Verify Certificate
Claude Code • AI-Assisted Development • Prompt Engineering
Claude Code in Action
2025
Anthropic | Verify Certificate
Claude Code • Agentic Workflows • AI Pair Programming
Google Play Academy - Store Listing Certificate
2025
Google | Verify Certificate
App Publishing • Play Console • Android App Distribution