Modifiers in Jetpack Compose Explained
Modifiers are ordered instructions that control layout, size, clicks, and performance. Learn why order matters and how to avoid common beginner mistakes.
Read More →Hello, my name is Masum Billah
I am a Senior Android Engineer
Senior Android Engineer with 6+ years of experience building scalable, high-impact mobile applications for 1M+ users. Expertise in Kotlin, Java, Jetpack Compose, MVVM, Coroutines, Room, Retrofit, and modern Android architecture patterns. Strong track record in reducing crash rates, improving app performance, and mentoring junior developers. Passionate about creating user-centric, efficient, and robust mobile experiences.
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About
My name is Masum Billah and I am a Senior Android Engineer
I hold a B.Sc. in Computer Science and Engineering from IUBAT and an M.Sc. in Computer Science from Jahangirnagar University. With over 6 years of Android development experience, I have worked on scalable mobile apps, reduced crash rates, and mentored junior developers. I am passionate about building impactful mobile solutions and contributing to innovative teams.
Birth Date: 06 February, 1992
Age: 33
Education: Master's (Computer Science )
Mobile: +61 434891726
City: Melbourne
Freelance: Available
Android
95%
Kotlin
90%
Java
90%
Firebase
85%
Android Studio
85%
Education
2016 - 2017
MSc in Computer Science
Jahangirnagar University
2012 - 2015
BSc in Computer Science & Engineering
IUBAT – International University of Business Agriculture and Technology
Awarded a 100% Tuition Scholarship based on academic excellence.
2010 - 2012
Higher Secondary Certificate (HSC)
Achieved a perfect GPA 5.00 out of 5.00 in the HSC exams.
Experience
Jan 2024 – Present
Senior Android Engineer
Bengal Mobile QA Solution
Key Achievements:
• Designed and developed 7+ major application modules, including Participant Selection, Enrolment, Supervision, Graduation, Approval, Group & Home Visit, SSO Login, Offline Sync, and Profile Management.
• Reduced overall application crash rates by 40% through systematic debugging, optimized architecture, and defensive programming techniques.
• Mentored and onboarded 3 junior developers, improving team productivity and code quality.
• Collaborated closely with PMs, QA engineers, and UI/UX designers to deliver scalable, high-performance features on schedule.
Project: UPG Digitalisation (Live) – Built with Kotlin
Nov 2021 – Dec 2023
Android Engineer
Bengal Mobile QA Solution
Continued contributions to the UPG Digitalisation
project, ensuring stability and performance of
Android applications at scale.
Oct 2020 – Nov 2021
Android & iOS Developer
VU Mobile Ltd
• Managed the entire mobile app lifecycle (Android
& iOS).
• Acted as a bridge between management, clients,
and end-users.
• Reduced miscommunication and post-release issues
by 25% with clear documentation.
• Delivered timely updates ensuring smooth user
experience.
Dec 2017 – Sep 2020
Junior Android Developer
ATI Limited
• Developed and deployed 5 Android apps including
HR and field-tracking solutions.
• Built RESTful APIs in Java for mobile–backend
communication.
• Integrated Google Maps, push notifications, and
third-party SDKs (Zoom).
Services
Mobile Application Development
I develop high-quality, scalable Android applications using Kotlin, Jetpack libraries, and modern architecture. I have built production-ready apps used by 1M+ users across enterprise, social, and field-operation platforms.
Clean & Scalable Architecture
I build maintainable codebases using MVVM, Clean Architecture, Coroutines, Room, Retrofit, and Hilt/Dagger. My focus is long-term scalability, modular design, and easy feature expansion.
UI/UX Implementation
I transform Figma/mockup designs into smooth, user-friendly mobile interfaces using XML and Jetpack Compose. My UI ensures intuitive navigation and clean interaction flow.
Responsive & Adaptive Layouts
I create adaptive layouts for all screen sizes—phones, tablets, and rugged devices— ensuring consistent performance and usability across diverse hardware environments.
App Optimization & Performance
I optimize apps by improving load speed, reducing memory usage, implementing caching, and applying defensive coding. Proven success: reduced crash rates by over 40%.
Integrations & Advanced Features
I implement advanced features like push notifications, Firebase services, offline sync, Google Maps, third-party APIs, real-time chat, and video calling (Agora SDK).
Website Development
I build fast, responsive, and SEO-friendly websites for individuals, portfolios, and organizations. My approach focuses on clean design, modern UI, and smooth performance.
Business & Organization App Solutions
I create custom digital solutions for companies and NGOs, including workflow systems, reporting tools, field-tracking apps, and enterprise-level mobile applications.
Portfolio
UPG Digitalisation
The Ultra-Poor Graduation (UPG) programme supports ultra-poor families through holistic training, monitoring and digital reporting. The app digitizes data collection and streamlines field-level operations.
Bissoy
A smooth and modern communication app that offers high-quality calling, fast connectivity, and a user-friendly interface used by millions in Bangladesh.
Tour Plan
A complete field-force automation system for medical representatives including doctor visit scheduling, route planning, reporting, and GPS-based attendance.
ATI ESS
An ERP-based employee app featuring attendance, leave management, payroll access, announcements, and workflow approvals for large organizations.
Exam System
A digital examination app used for internal employee assessments, training quizzes, automated result processing, and performance tracking.
BD Tone
A ringtone & caller tune service app where users can browse, preview, and activate tones directly from their mobile device.
Contact
Any questions?
I'M AVAILABLE TO HELP
Call me
+61 434891726
SEND A MESSAGE
I’LL BE HAPPY TO REPLY
Achievements
Recognition Award
For outstanding performance at Bengal Mobile QA Solution.
Crash Rate Reduction
Reduced crash rates by 40% through debugging and defensive coding.
Mentorship
Onboarded and mentored 3 junior developers, boosting team efficiency.
Core Modules
Developed and deployed 7+ Android modules for UPG Digitalisation.
1M+ Downloads
Achieved 1M+ downloads and 4.5★ rating for Bissoy (E-Consultant) app.
Problem Solving
Solved 500+ coding challenges on platforms including LeetCode.
Blog
Jetpack Compose
Jetpack Compose
Column vs LazyColumn in Jetpack Compose
Choosing between Column and LazyColumn impacts performance and memory. Learn when eager rendering is fine, when lazy lists are required, and best practices every Compose developer should follow.
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Jetpack Compose
Stop Over-Recomposing Everything in Jetpack Compose
Many Jetpack Compose performance issues are self-inflicted. Learn common recomposition mistakes and how to fix them using remember, derivedStateOf, and stable state.
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