Yosua Yuwono, Product engineer who designs.

My first real project was three games. For a university accounting event at Widya Mandala, Davin and I built a web game platform: an airplane chase where every right answer moves you forward and the last row gets burnt, a memory card game, and a Monopoly-style board with dice and pawns.

I designed the visuals, including character customisation so every student played as someone that felt like their own. Behind it ran an admin panel for live rooms over Socket.IO, where the organisers could also write and edit the quiz questions.

I was still a student at iSTTS. The players had a blast, and Widya Mandala came back the next year asking for a Unity game. My final exams got in the way of that one.

Through an internship program with outclass.id, four of us built Kantin Sehat from scratch: a mobile-first app for school canteens, where students pay for their food and parents can see what their children actually bought.

There was no codebase to inherit and no mentor, only someone overseeing the program. The app was never published, but it is where I learned to speak up early and keep the whole team in the same picture.

A five-month contract to design and build a learning platform for Centrum Ivan Merz, where people attend Catholic learning classes. Most of them are older, so the work started with UX research into how older people read, move through and get lost on a screen.

The requirements kept changing, the timeline stretched with them, and the platform never launched. It taught me how much a product depends on agreeing what it is before building it.

My first project was frontend only: the designs were done, and my job was to check them and build them. After that, clients mostly came with the features they wanted, and Wirawan, our tech lead, and I planned and built the rest between the two of us.

He led, but almost every decision was a conversation, and he talked an approach through with me before we committed to it. That is where I stopped implementing and started owning what we built and why.

Over nearly three years that added up to tens of client products, most of them under NDA, plus internal tools and the company's own site. I was also in charge of outsourced work, reviewing it to keep it working and on course. My contract ended in May 2026.

I co-founded Quanta Labs, a product studio, with Davin from the accounting game. It took client ideas from first brief to launch.

Gaiana moved a dress-rental business off spreadsheets and shared drives onto its own storefront and back-office, five months from first commit to going live. For Eastern Star Logistics we built a freight management system, customer-side shipment tracking and their landing page.

Techova Labs builds AI automation for the work that eats a team's time. Our first product, Terbit, turns one article or script into Instagram carousels, posts and stories, each in the brand's own template, in minutes.