UC Berkeley · Mechanical Engineering

From an idea to something you can use.

I’m Vivian Yang—Berkeley engineer, Cloak founder, and builder across consumer software, AI products, and physical prototypes.

Explore my work ↓Request résumé ↗
Email me ↗
Preview of the Cloak privacy extension websiteCloak · Shipped workcloak.build ↗
131Cloak installs
24 hoursSTING · solo hackathon build
2M+organic creator views
1st placeSimular sponsor prize

How I build with AI

18.1B lifetime Codex tokens.

I define the specs, direct implementation, debug, and test.

789.8M peak tokens109-day streak at capture
October 17 Codex usage snapshot showing 18.1 billion lifetime tokens, 789.8 million peak tokens, a 1 hour 56 minute longest task, and 109 day current and longest streaks
October 17, 2026 · View full size ↗

AI product consulting · Piedmont Consulting Group

Orcana AI

Co-leading a client engagement and managing a six-person Berkeley consulting team across MVP development, pharma segmentation, onboarding, competitive research, and go-to-market strategy.

Total client project value: $3,000 · Engagement in progress

Engineering beyond the screen

Code, research, and physical prototypes.

My work spans browser software, Berkeley Lab workflow automation and data science projects, and a team-built sorting-trash-can prototype at Berkeley.

See selected projects ↓

Interaction Club · Product & community

Built the product.
Set the table.

Small-group friendship dinners that turn meeting new people into an actual plan. I built the product, brought in the first signups, and hosted the first Berkeley builder dinner—all in one week.

1 week
From build to first dinner
36
First-week signups
Oct 8
First Berkeley dinner · 2026
Explore Interaction Club ↗
Interaction Club homepage with the headline We want you at our table and a playful invitation envelopeMeet new people over dinner

01 · Shipped software

Make invisible tracking visible—and controllable.

Cloak is my browser privacy project: an exercise in taking a consumer product through implementation, distribution, activation, and support. It reached 131 installs.

Cloak · Founder & builder

From browser protection to checkout and support.

Visit Cloak ↗
  • Built and shipped Chrome and Safari privacy products, the public website, subscription checkout, activation system, and support loop in five months while enrolled at UC Berkeley.
  • Defined product specifications and directed AI coding agents through implementation, debugging, testing, and QA, with responsibility for product and technical decisions.
  • Built protections for selected tracker requests, recognizable URL identifiers, readable tracking state, and fingerprinting surfaces, with local session receipts showing users what changed.
  • The work gave me hands-on experience with the systems around a product: browser behavior, billing, activation, and user-facing explanations.

02 · Selected work

Selected projects.

Shipped websites, software experiments, and hardware prototypes—work spanning product design, implementation, and testing.

01

Hackathon prototype · Solo build · 24 hours

STING

Anti-scam browser extension. Built solo as a 24-hour prototype. 1st Place · Simular Sponsor Prize · Cal AI Hackathon 2026.

Try STING ↗
02

AI video editing · Prototype

Skein

Explores turning one authentic take into multiple clips, with creator approval and control of source material and likeness built into the workflow.

Explore Skein ↗
03

AI operations · MVP experiment

Field Office

An MVP exploring approval-based workflows for service businesses, from lead intake and scheduling to jobs, invoicing, and dispatch.

Open Field Office ↗
04

Built in 1 week · 36 first-week signups

Interaction Club

Small-group friendship dinners. Built the product, reached 36 signups in the first week, and hosted the first Berkeley builder dinner on October 8, 2026. Outreach to potential company customers followed.

Visit Interaction Club ↗
05

Top-10 Finalist · Week-long Hackathon · Solo Founder

SCET Innovation Intelligence Hackathon

Named a top-10 finalist on October 11, 2026, in the SCET Innovation Intelligence Hackathon during SF Tech Week.

06

Interactive portfolio · Musical UI

Cookie Jar

A draggable, flippable portfolio that turns project stories into a tactile interface, with every interaction mapped through the circle of fifths.

Open Cookie Jar ↗
07

Biodegradable skincare · High-school venture

ByoGlo

Co-created a biodegradable pimple-patch business in high school and independently coded its entire customer-facing website.

Visit ByoGlo ↗
08

Independent product build

DopaMINE

An independent product experiment built through rapid prototyping, testing, and iteration.

Oski Sorting Trash Can team with prototype
09

Team hardware prototype · CAD · Arduino

Oski Sorting Trash Can

Worked with a Berkeley PREP team to design and build a sorting-trash-can prototype using CAD, Arduino, and 3D printing.

04 · How I operate

Ask directly. Find a way. Keep moving.

The Berkeley polo story captures how I work: I go to the source, make the ask, and turn uncertainty into forward motion.

Ask me how I got the polo ↗

Berkeley, beyond class

Engineering, consulting, and founder programs.

UC BerkeleyMechanical Engineering
Piedmont Consulting GroupConsultant · product, GTM, onboarding, and UX
Founder Summit · SkyDeck ACESelected founder programs

Earlier recognition: Berkeley Lab technical programs · DECA placement