johan_u

About

What about myself?

Hello again. My name is Johan Untawidjaja, and the short version is this: I was born in Singapore, grew up in Indonesia, and have now come back to Singapore to study engineering — which, if you squint, is a fairly long way to travel in order to end up where I started.

Johan Untawidjaja standing on Mount Batur in Bali at sunrise, with mist over the valley below.

Mount Batur, Bali — 04:00 start, and worth every minute of it.
Taken during DIVE 2026 with Institut Teknologi Sepuluh Nopember.

The line I keep coming back to

Know thyself.
The Delphic maxim, carved at the Temple of Apollo — and the one Socrates took as his own.

Where I come from

I spent most of my life in Indonesia, where the clock seems to tick slower than anywhere else in the world. I have always credited that to the surroundings — the warm breeze, the trees moving against each other, and an orange sunset arriving at almost exactly the same hour every evening. It is a good place to think slowly, and I did a great deal of that.

Both of my parents are entrepreneurs with backgrounds in accounting, which is probably why I find numbers reassuring rather than intimidating. Growing up, a spreadsheet was not an abstraction; it was a household object. That inheritance shows up in odd places — it is the reason my first properly deployed product was a financial tool, and the reason I care whether a prototype could ever pay for itself.

What I study

I read Engineering Product Development at the Singapore University of Technology and Design, on an ASEAN Undergraduate Scholarship. My Freshmore terms carried me through design thinking, physical and technological systems, modelling and analysis, design computation, data-driven modelling, uncertainty, energy systems — and, unexpectedly, urban sketching, which turned out to be the course that most changed how I look at an object before I draw it.

Before that I completed the Pearson Edexcel A-Levels, with an A in Mathematics, Physics and Chemistry. Those three are not a coincidence. They are the subjects I would have chosen even if nobody were grading them.

EPD CAD & fabrication Electronics Python · C++ Statistical modelling Photography

How I think

In physics and chemistry, I can picture how particles sit and interact, and how that accumulates into the world we actually walk around in. In mathematics, I can take something abstract and pin a number to it, which is the only honest way I know to tell whether a thing is getting better or merely getting different. Most of my notebooks are diagrams in far too many colours.

You will often find me staring into the middle distance somewhere quiet. People ask why the long face. It is usually nothing so serious — I am imagining a world without friction, and wondering whether anything would actually get done in it.

Music

I have perfect pitch, which is less impressive than it sounds and more useful than it looks. I play piano, guitar and bass, and inside the SUTD Chinese Orchestra I play dizi, zhongruan, the Chinese drums, and the double bass — the last of which I learned from nothing to concert standard within a single term, under a mentor who was considerably more patient than the situation warranted.

I was President of the orchestra from March to September 2026, after running marketing for our TENacity concert. The role turned out to be less about performing than people usually assume: budgets, sponsorship, procurement, and making sure a room of musicians had somewhere to be on a Thursday. I handed the role on in September and still play.

Photography, and everything else

I photograph constantly, and most of the images on this site are mine. It earned me the Judges' Choice Artwork at my school's art exhibition and a place representing the school at FL2SN — but mostly it earns me a reason to keep looking at things properly. Outside of that: badminton, football, the occasional game of pool (the table kind, not the swimming kind), and an unapologetic family habit of hunting down new restaurants.

How I work

I treat AI as a teammate rather than a vending machine. That means writing the specification first and directing the tool against it, instead of improvising prompt by prompt — and then reviewing whatever comes back as I would review a colleague's contribution. On my last build, the tool reported three defects to me; I read the source, disproved two of them, and fixed the one that was real.

The habit underneath all of it is the same one the doorbell taught me: the version that fails tells you considerably more than the version that works. I would rather find out early, in a workshop, than late, in front of a room.

What I don’t know yet

Everything above is a record of things that worked out, which makes it only half an account. Here is the other half — I would rather you had it from me than found it in an interview.

  • 01
    C++ I have written C++ that ran in competition, under deadline, inside a framework somebody else designed. That is not the same as being fluent, and I am not going to claim otherwise. It is the next thing I am closing.
  • 02
    Large assemblies in CAD I can model a part, and a small assembly of parts. I have never taken an entire robot through CAD as one coherent assembly — with the mates, interferences and tolerance decisions that only appear at that scale.
  • 03
    Somewhere with no head start Bali taught me a great deal, but I was an Indonesian working in Indonesia — the language and most of the cultural floor were already under me. I have not yet worked somewhere that gives me none of that, and I genuinely do not know how I handle the harder version of that discomfort. It is most of why I want the exchange rather than a reason to doubt it.
  • 04
    Most of statistics Regression and analysis of variance I have used. Multivariate analysis, time series and experimental design I have not — and each of them sits directly underneath the kind of work I want to be trusted with.

Get in touch

I am looking for an engineering internship where a product has to survive an actual user, and for an overseas exchange placement. I am available September to December 2027 and May to August 2028. If that sounds like something you are running, I would like to hear about it.

One practical note, so nobody has to email and ask: I am an Indonesian national, studying in Singapore on a student pass. If a role needs anything beyond that, tell me which country and I will confirm exactly what applies rather than guess at it.

Résumé

Both pages, without the download

Everything above, condensed onto two sides of A4. This is the public copy — identical to the one I send, minus the phone number. Click either page to read it full size.