B.Eng. Engineering Product Development · SUTD · Class of 2029
Johan Untawidjaja
Greetings. I am an engineering undergraduate in Singapore, an ASEAN Undergraduate Scholar,
and — depending on the hour — a photographer, a perfect-pitch pianist, or the person at the back of the
orchestra carrying a double bass he learned from scratch in a single term. This is where the work lives:
the things I have designed, deployed, pitched, and occasionally broken on purpose to find out why.
Each one is written up in full on the projects page — what the problem
actually was, what I got wrong first, and what survived contact with a real user.
Jurnal Lentera Bursa
Sept 2026
A trading journal and calculator for Indonesian retail investors on the IDX. It answers the questions
a broker app quietly refuses to: what a trade costs once every fee is counted, where the exchange's
price fractions land you, what the auto-reject ceiling and floor are today, and what your true
break-even price actually is.
I directed an AI teammate through the build and then audited it. Of three defects it reported back
to me, I disproved two by reading the source and fixed the one that was real. That habit — treat the
output as a colleague's contribution, not as an answer — is the part I would want to be judged on.
Decipher
Feb 2026
PathFinder 2026, a two-day deep-tech case run by SUTD I&E and SEVEN. One of nine teams, handed a live
research project — software that characterises noise inside quantum processors — and asked to make a
business of it. We built a TRL 3 to 9 roadmap across superconducting, photonic and trapped-ion hardware
and pitched it to an external mentor, the principal researcher and an industry judge.
CommercialisationDeep techTeam of 4
Konora
May 2026
Two weeks in Bali with Institut Teknologi Sepuluh Nopember. Traditional Balinese performers lose thirty
to forty per cent of every fee to middlemen, and no registry of them exists — Instagram is the
infrastructure, WhatsApp is the contract, cash is the payment processor. We designed the marketplace
that closes that gap, and let performers define their own boundaries on what they will and will not perform.
Global immersionMarket researchIndonesia
SeenScreen
Jan – Mar 2026
A carriage-occupancy display so MRT passengers stop packing into one cabin while the next runs half empty.
I owned the simulated build in CAD, the final product design, and every poster and slide that went on the
wall at the iDeA showcase.
CADProduct designExhibited
Solar-Powered Doorbell
May – Aug 2026
A doorbell sized by battery and photovoltaic calculation to run without ever touching mains power. The
first enclosure sealed the panel in and promptly muffled the speaker and trapped heat; the second one
gave the sound and the airflow somewhere to go. The failure taught more than the calculation did.
Energy systemsFull CAD setIterated
MediSync
Sept 2025
A medication and appointment reminder for elderly users with no smartphone and no dependable internet —
ESP32 firmware, a web application and a serial bridge between them. The bridge did not survive the
device's RAM budget, and we diagnosed that live, in front of the room.
HackathonESP32Shipped a diagnosis
Off the bench
The other half
I have never believed the engineering and the music are separate activities. Both are the same instinct —
take something structured, find where it bends, and rebuild it so it sounds right.
01
SUTD Chinese OrchestraPresident since March 2026, marketing executive for the TENacity concert before that. I play dizi, zhongruan, double bass and the Chinese drums — the double bass from nothing to concert standard in one term, under a mentor with more patience than I deserved.
02
PhotographyJudge's Choice Artwork at the Santa Laurensia Art Exhibition, and my school's representative at FL2SN. Most of the images on this site are mine.
03
Communities built from nothingFédération d'échecs Santa Laurensia, 中华小天地 (Little Chinese World), and Rejuvenate — whose peer-tutoring arm, Rejuvenate Grades, I led.
04
Competitive roboticsSUTD Competitive Robotics, VEX U. Sheet metal and motor assembly on one side of the bench, autonomous routines and camera calibration on the other. A Laurel Award at the 2026 Student Achievement Awards, shared with the team.
In progress
Being written
This site replaces my old Google Site. Home, Projects and About are live; the rest arrives chapter by chapter.
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CompetitionsPathFinder, Infinitics mathematical modelling, INASEC, the ICT Awards, and the physics olympiads.
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MusicSUTDCO, the instruments, and what running a student orchestra's budget actually involves.
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PhotographyA proper gallery, rather than photographs used as evidence for something else.
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LearningWorkshops, certifications, and a straight account of how I work with AI tools and where I refuse to trust them.