Mahmudul Hasan Khan
Hello, I’m
Android Engineer
Software engineer from Dhaka. My Android apps have pulled in close to a million downloads, and my web work runs in production for real clients. I care about the details most people scroll past.
Available for full-time roles & freelance projects
I’m a software engineer from Dhaka with over four years of experience in mobile development. Most of my work is native Android, built with Kotlin, Java and Jetpack Compose, and I also ship cross-platform apps with Flutter and React Native. I like working close to the platform, from system-level customization and AIDL to architecture that stays easy to maintain as a project grows. That approach has paid off: my apps are closing in on a million downloads.
On the web I build full-stack products with Next.js, React and Node.js, handling everything from the interface down to APIs, authentication and data. I’m also fluent in modern AI tooling, from coding agents to CLI tools and LLM-powered workflows, and I know where it fits into serious engineering work and where it doesn’t.
Before any of that, I spent years in competitive programming and open source. Both stuck: I still maintain my own projects, contribute to others and take on contract work for long-term clients.
april 2025 - present
march 2025 - present
april 2023 - present
featured project
Open-source Android theming application.
Built on Runtime Resource Overlays and Xposed hooks to restyle system UI without repacking OEM firmware - shipped across wildly fragmented Android ROMs with 500K+ downloads.
featured project
Material You color control for Android 12+.
Drives Android’s Material You theming engine directly over AIDL through a privileged system service, applying live palette changes without a reboot - 200K+ downloads.
Live wallpaper that puts the depth effect on Android. The subject is cut out of your photo on the device itself, then the clock is composited behind it, so the person overlaps the numbers.
Royalty ledger for a figure studio. Artists and character owners type a four-digit ID to see what they are owed, admins log prints and settle balances, and every payment can be reversed without losing the trail behind it.
Desktop app that clears build output, caches and dependency folders off your disk. A folder is only ever listed when a project marker file sits above it, so nothing outside a real project is a candidate, and nothing is deleted until you check it.
Multi-tenant SaaS for building storefronts: sign up, lay out a shop in a drag-and-drop editor, and take payments locally or internationally. Free sites live on a subpath, paid plans get a domain of their own.
Incredible work! Delivered a complex Java backend project flawlessly and faster than expected. He is super-efficient, highly skilled, and a true lifesaver!
jaywhiz00
Fiverr · Nigeria
Very professional and fast. All recommendations for this guy!
sofix19
Fiverr · Croatia
I had an outstanding experience working with this freelancer! He delivered a complete Android Studio project with full, detailed documentation — and did so well ahead of the agreed deadline. His technical expertise and deep understanding of both Android development and the overall project requirements were impressive from the start. The code he delivered is clean, well-structured, and highly professional. He followed best practices and made sure everything was scalable and easy to maintain. Every function and module was clearly documented, which made the entire project incredibly easy to understand and continue working on. Communication was smooth and consistent throughout. He was proactive, quick to respond, and always open to feedback or changes. He not only met all expectations but exceeded them in every possible way — from delivery time and code quality to clarity of documentation and overall professionalism. I highly recommend him to anyone looking for a reliable, skilled, and dedicated Android developer. I will definitely be working with him again in the future!
marijnko
Fiverr · Croatia
Amazing quick add ons in a matter of hours
rakanaaaaaaaaaa
Fiverr · Saudi Arabia
just the best we will keep hiring him
michaelmalka29
Fiverr · United States
the best person on the platform
marijnko
Fiverr · Croatia
Told me he needed 3 days and finished in less than a day with amazing work.
rakanaaaaaaaaaa
Fiverr · Saudi Arabia
one of the best developers
michaelmalka29
Fiverr · United States
Really happy with the work! Everything was done smoothly and just as I asked. Super easy to work with and quick to respond. Would definitely work together again.
jaywhiz00
Fiverr · Nigeria
Love your app and everything you do! I wish that women protector app you have was also for iPhone because I would absolutely have my gf install that on her phone... Amazing work and it will one day save a life
Kyler
Telegram · United States
Incredible work! Delivered a complex Java backend project flawlessly and faster than expected. He is super-efficient, highly skilled, and a true lifesaver!
jaywhiz00
Fiverr · Nigeria
Very professional and fast. All recommendations for this guy!
sofix19
Fiverr · Croatia
I had an outstanding experience working with this freelancer! He delivered a complete Android Studio project with full, detailed documentation — and did so well ahead of the agreed deadline. His technical expertise and deep understanding of both Android development and the overall project requirements were impressive from the start. The code he delivered is clean, well-structured, and highly professional. He followed best practices and made sure everything was scalable and easy to maintain. Every function and module was clearly documented, which made the entire project incredibly easy to understand and continue working on. Communication was smooth and consistent throughout. He was proactive, quick to respond, and always open to feedback or changes. He not only met all expectations but exceeded them in every possible way — from delivery time and code quality to clarity of documentation and overall professionalism. I highly recommend him to anyone looking for a reliable, skilled, and dedicated Android developer. I will definitely be working with him again in the future!
marijnko
Fiverr · Croatia
Amazing quick add ons in a matter of hours
rakanaaaaaaaaaa
Fiverr · Saudi Arabia
just the best we will keep hiring him
michaelmalka29
Fiverr · United States
the best person on the platform
marijnko
Fiverr · Croatia
Told me he needed 3 days and finished in less than a day with amazing work.
rakanaaaaaaaaaa
Fiverr · Saudi Arabia
one of the best developers
michaelmalka29
Fiverr · United States
Really happy with the work! Everything was done smoothly and just as I asked. Super easy to work with and quick to respond. Would definitely work together again.
jaywhiz00
Fiverr · Nigeria
Love your app and everything you do! I wish that women protector app you have was also for iPhone because I would absolutely have my gf install that on her phone... Amazing work and it will one day save a life
Kyler
Telegram · United States
what's next
I’m open to remote roles, contract work and projects worth doing well.
Want to talk through an idea - or just say hi? My inbox is open.