Thien Hau T.

A client in the US shipped a Bluetooth device halfway around the world, all the way to me here in Vietnam. Then he waited three weeks for it to arrive. He could have hired someone much closer to home. He chose to wait for me instead.

That story tells you what I actually do. Anyone can build a mobile app. The hard part is making the app work with a real physical device, and keeping it connected when you switch to another app, the signal gets weak, or the battery runs low. That's where most projects quietly fail. It's also why my client didn't want the nearby option. He wanted someone who would get the device right, and built the app right.

Over 17,000 hours on Upwork and 70+ clients, I've built apps for all kinds of devices: a heart monitor used in healthcare, car alarm and remote-start systems, a tap-to-pay card reader, a skydiving altimeter, Bluetooth printers, and smart scales. I even keep a shelf of the small electronic boards these devices run on.

But the device is only half the job. To deliver the whole product, I work across every major mobile toolset: Flutter, iOS, Android, and React Native. I pick the right one for your project, or match the app you already have. So one person handles the app, the connection to your device, and getting it approved on the App Store and Google Play. Not three separate hires.

Recently, I'm now Anthropic-certified in building with Claude, and it would benefit you if we go together. Claude handles the repetitive coding work, so you need a smaller team (one senior developer now covers what used to take several) and launch sooner & monetize quicker.

One past client said it better than I can:
🗣️ "Hau demonstrated excellent knowledge and skill in completing the project and produced high quality outcomes. The project involved a complicated architecture with both cloud and hardware connections which Hau was able to handle well."

Google Certified Android Developer · Anthropic Claude Certified · Upwork Top Rated Plus (top 3% of freelancers, 100% Job Success)

If you have a device that needs an app, or an app that needs to go live, send me a message and let's talk.

🕛 I'm in ICT (UTC+7️⃣), but can work in any time zone.