Flutter & Mobile App Developer
I build cross-platform apps that feel native — from the first pixel to the payment gateway.
About
A passionate Flutter/Dart app developer dedicated to transforming ideas into high-performing mobile experiences. With expertise in cross-platform development and native Android technologies like Kotlin and Java, I create visually appealing and efficient applications. Committed to innovation, open communication, and excellence, I strive to bring your vision to life with cutting-edge solutions.
Today I work across the stack: Flutter and native Android on the front end, .NET and C# services behind them, and Azure DevOps pipelines to ship it all. Recent work spans a multi-platform CRM with Stripe payments and subscriptions, location-based features built on the Google Maps API, and end-to-end test coverage with Playwright.
Selected work
Cross-platform apps in production — with real payment flows, offline behaviour and cloud backends behind them.
A cross-platform shooting-range companion with multi-party payments and real-time sync.
An in-car audio experience that keeps working when the signal does not.
A full-featured mobile storefront, from browsing to secure checkout.
Scheduling that adapts cleanly from phone to tablet.
A CRM for hail and PDR auto-body shops, with subscriptions and in-app payments.
Stabilizing and monetizing an existing consumer health app.
Experience
Cerebrum City
Own end-to-end testing with Playwright, building automated coverage for critical user flows. Support teammates on backend work in .NET and middleware, and go deep on DevOps with Microsoft Azure across CI/CD pipelines and deployments.
Mascopia Inc.
Main lead Flutter developer, owning app architecture and release delivery. Built location-based features with the Google Maps API including live tracking and geocoding, and adopted DevOps practices with CI/CD pipelines and automated builds.
Dent Shop Manager
Built a multi-platform CRM covering shop and customer management. Developed the .NET backend end to end — data models, REST APIs and authentication — and integrated Stripe for payments, subscriptions and automated invoicing.
Practical Defense Training, LLC
Reduced development and maintenance costs, improved code maintainability and enhanced the app's scalability, while keeping the experience seamless and consistent across Android and iOS.
Shiftboard
Rewrote an entire app from native to a cross-platform Flutter solution, ensuring a consistent user experience across Android and iOS and optimizing backend communication and API handling.
Upwork
Designed, developed, tested and deployed mobile applications using Java, Kotlin, Swift and Flutter. Provided direction across phases of the development lifecycle and managed multi-platform regional and national campaigns.
Crazybot Studio
Founded and run my own app development studio.
Leading University
Expected graduation fall 2027
I have hired Tanjim many times, and I would still do it again whenever any need arises. He is very professional and committed. He is attentive to detail, punctual, and is always on time. He makes sure to get business requirements right. It has been a pleasure working with Tanjim.
Tanjim did a great job, completing all work above expectations and in a timely manner, with the work being completed ahead of deadlines. I have very limited understanding of coding, and have ideas that will grow outside of the original scope of work. Tanjim made reasonable accommodations and discussed any budget concerns ahead of time so that there were not any unexpected costs. I look forward to working with Tanjim again in the future.
Hired for a specific purpose to update my mobile app. He did the job well, quickly, and was great with communication. Would hire again.
Contact
Tell me what you are building and where it is stuck. I reply to every serious enquiry within a day.