Khang Hy
Hiring? CV & case pack →Book a call

Product designer & builder · work across semiconductor HMI, B2B SaaS, PropTech, AgriTech, mobility, e-commerce, childcare apps

From a rough brief to a product that ships.

Rules first, then design, then an AI-assisted build I direct and check screen by screen. I don't write the code; I make sure it matches.

Book a 30-min callSee the work
Semiconductor HMIOperator interfaceAt ARISSemiconductorNDAFeedbackMeSelf-serve SaaSAt ARISB2B SaaSMulti-tenantConstruction Tech PlatformOne record, five rolesAt ARISPropTechWeb + mobileAotomatic16 steps into 5 phasesAt ARISAgriTechMobileBtaxiRider, driver, adminIndependentMobility3 appsDStoreStore + VietQR checkoutIndependentE-commerceSolo buildWaku NaviShort video for parentsAt ARISChildcareiOS & Android
7products shipped
5live products you can open today
3+years, solo or as the sole designer
60hDStore, from brief to handoff

Seven products, in domains that rarely overlap.

End-to-end buildIndependent clientFashion · E-commerce60 working hours

A fashion store with admin and VietQR checkout, built by one person in 60 hours.

DStore needed a storefront, an inventory admin and lookbook content on a startup budget. I designed it, wrote the spec and directed an AI-assisted build from brief to handoff.

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A build like this: Full-scale MVP, from $5,500 See this scope

Illustration: a storefront with a VietQR checkout card
Checked before the first screen
  • Is the business registered for e-commerce with the Ministry of Industry and Trade?
  • Can the product sourcing pass an IP check?
  • Can checkout legally take payments on launch day?
SpecResult
End-to-end buildIndependent clientMobility · CambodiaIn testing

A ride-hailing MVP for Cambodia, across rider, driver and admin.

I owned the design, the product logic and the build: directing two contract developers, external QC and an AI agent in Cursor, and checking every build against the business rules I wrote.

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A build like this: multi-app, priced after a scoping call See this scope

Illustration: rider, driver and admin views with the coupon rule
Pricing and payment rules
  • Coupon applied to the base fare.
  • Rider tops up by QR transfer, then uploads the payment screenshot.
  • Admin checks and approves every top-up.
SpecResult
Design & system workAt ARIS VietnamSemiconductor · NDAOngoing R&D

An operator interface for a wafer grinding machine, where one wrong screen state can destroy a wafer.

I joined three years into development, with no brief and no UX docs. As the sole designer among about 30 people across three vendors, I turned years of hardware logic into an interface operators can trust and frontend teams can build.

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Similar work: UX audit, quoted after a short call See this scope

Illustration: a wafer with its notch, a grinding path and a thickness scale from 435 to 365 µm
Rules for the cleanroom
  • Every touch target at least 50px; primary controls at 64px.
  • Destructive actions sit apart, in red, never next to Start.
  • Three controls per panel, so a gloved hand has one clear choice.
SpecResult
Design & system workAt ARIS VietnamB2B SaaSV1.0 launched

An internal tool, redesigned into a SaaS clients can set up themselves.

Every new client used to need a developer editing the database by hand. As the sole designer, I redesigned the configuration system, the admin and the onboarding, so basic setup now starts from one spreadsheet upload.

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Similar work: UX audit, quoted after a short call See this scope

Illustration: a client spreadsheet turning into a ready workspace
Self-serve onboarding
  • New client signs up and uploads their Excel file.
  • The file maps to data structures automatically.
  • Workspace ready, no dev needed.
SpecResult
“Hy bridges design and execution. We moved from scattered ideas to shippable product decisions much faster than expected.”
Duong Nguyen Bao DuyFounder, Btaxi
About

I started with design, then learned to build the system around it.

Most of my work comes from outsourcing, in domains that rarely overlap. I validate every decision with the people closest to the problem: domain experts, engineers and the client's own team.

More about me ›

More work.

Illustration: one shared project record feeding five role viewsConstruction Tech Platform: one project record for five rolesAt ARIS VietnamPropTechWeb + mobileIllustration: 16 steps collapsing into 5 phasesAotomatic: 16 disconnected steps, grouped into 5 phasesAt ARIS VietnamAgriTechMobileIllustration: a fan of short-video cardsWaku Navi: short video for parents in JapanAt ARIS VietnamChildcareLive on App Store & Play

Sound familiar?

Send me the messy version.

Book a 30-min call
0 → 1

Founders shipping an MVP

Product thinking and a frontend build in one loop.

See MVP packagesFrom $1,500
1 → N

Teams on workflow heavy products

Where clarity and operator confidence matter more than trends.

See UX auditQuoted after a short audit call

Rules before screens.

My build has no code layer to quietly absorb a vague spec, so the spec has to be tight. That is where I spend the first days of every project.

  • Step 01Understand the product and its limitsMost briefs arrive with missing context. I map the roles, flows and edge cases, and write the business rules down before anything is drawn.
  • Step 02Structure first, polish secondFlow, hierarchy and reusable patterns come before visual detail, so the design system holds up when the product grows.
  • Step 03Direct the build, check every screenI direct the AI agents and developers who write the code, and QA each screen against the rules we agreed on. You see progress in a weekly Loom.

Pick what you need. See the price as you go.

Fixed starting prices, no retainers. Every change updates the total on the right, so there are no surprises on the call.

Send me the messy version.

No commitment. Here is exactly what happens after you reach out.

Book a 30-min callhi@khanghy.work
+84 395 478 377
Your scope, sent with the bookingCore MVPEstimated from $3,200
50% deposit to start: $1,600 · Delivery 3–4 weeksEdit scope
30-minute callWe go through the idea, the users and the must-haves.
hi@khanghy.workBook a 30-min call
  1. 01Send your briefEmail me, or book a call and bring the messy version.
  2. 0230-minute callWe go through the idea, the users and the must-haves.
  3. 03Proposal in 48 hoursA written scope, price and timeline.
  4. 04Build startsAfter a 50% deposit, with a Loom update every week. Not a fit? The deposit is refunded.