Hi, I’m Sai.

I’m Sai Kham Hein, originally from Myanmar and now based in Singapore. I’m a senior design engineer with a background in embedded firmware. Much of my work happens where software meets a physical device: bringing up a board, tracking down a firmware issue, or getting a machine-learning model to run within the limits of a small system.

I’ve worked on industrial systems, medical devices and custom electronics. I also review technical work and help other engineers work through problems.

How I work

I usually start by asking what we’re trying to achieve, what’s unclear, and which constraints will shape the answer. I like to understand why an approach makes sense, compare the tradeoffs, and hear objections before committing too much to it.

Then I look for a useful first version we can actually try. I prefer keeping the scope manageable and checking how the pieces behave together, using the results to decide what to change next. When something doesn’t work, I want to understand which assumption needs revisiting.

I keep the process lean and record the decisions that will be useful later.

Personal projects

One recent example is a USB hub for development boards. It started with a simple bench problem: power-cycling individual devices without repeatedly unplugging cables. I’ve also been working on a 3D-printed enclosure for software-defined radio hardware, where connector access, mounting and actual fit are part of the design. Both projects are still prototypes.

Other interests

My interests extend into on-device speech recognition, LoRa networks and software-defined radio.

I also spend time on DIY hardware and 3D-printing projects. Outside electronics, I enjoy photography, mostly food and scenery.

This is a place to share what I’m building, the decisions along the way, and what I learn from trying things out.