Now booking projects for Q4 2026

Websites and web apps, built properly.

From a landing page to a full product with payments. One senior engineer, from first sketch to launch.

Jimmy Hwang, Berlin
Senior product engineer

Start a project See the work

partyx.info/console

Admin console I built: money coming in, refund requests and a dispute to answer

Live paymentsCheckout to refund

One engineerDesign to production

My work runs every day at

Stockholm Arlanda Airport
ArcelorMittal
Eramet
PartyX

Services

Three ways to work together.

For businesses

Website or landing page

A fast, sharp site that brings in customers.

From €3,000

Usually 2–4 weeks

Designed and built, mobile first
Fast, secure, easy to find on Google
Forms, bookings or payments built in

Start a website

For startups and teams

Web app or MVP

Your product live, with real users and payments.

From €12,000

Usually 1–3 months

Accounts, dashboards, bookings
Payments and ticketing are my speciality
Your code, your accounts

Plan a web app

For engineering teams

Senior engineer on contract

Your hire takes 6 months. I can start now.

From €800/day

Remote or in Berlin, 3–12 months

Start with 2 paid days
Fast with AI, careful where it matters
Hands over when your hire arrives

Discuss a contract

Selected work

Built, shipped, and still running.

PartyX

Ticketing platform with live payments. Designed, built and run by me.

6 apps2 years of live payments50+ organisers

Used every shift at Stockholm Arlanda Airport, ArcelorMittal and Eramet.

WiTTRA Networks

Realtime operator console for industrial IoT. Senior engineer since 2023.

Enterprise customersContinuous releases

Admin console home: passes out, doors, money and what is waiting on you — **Admin console**One screen for the night: passes, door, money

iOS app: tonight in Berlin — **iOS app**Tonight in Berlin

PartyX festivals page: European festivals with country filters — **Web app**Festivals across Europe

Admin console on a phone: working the door — **Admin console**Working the door

Admin console: building an event's tickets, with the guest view beside it — **Admin console**Build the tickets, see what guests see

Onboarding on a phone: a venue owner verified, four steps to take the page — **Onboarding**Prove it is yours, take the page

Web app on a phone: happening now in Berlin — **Web app**On a phone

Admin console: money coming in, refund requests and a dispute to answer — **Admin console**Money in, refunds to decide, a dispute to answer

iOS app: an event, saved to your nights — **iOS app**An event, saved to your nights

Process

Simple from the first call.

A 20-minute call

What you need and by when. Free, no slides.

A fixed scope

A written scope and price before any work starts.

Build and launch

Demos along the way. You own the code and every account.

Hi, I'm Jimmy.

Senior product engineer in Berlin. I built the operator console used every shift at Stockholm Arlanda Airport, and on my own I built and run PartyX, a ticketing platform with live payments.

I use AI to move fast and review every change myself. You get the speed, and work that holds up.

FAQ

Good questions.

What does it cost?

Landing pages start at €3,000 and most websites land between €4,000 and €9,000. Web apps start at €12,000, contract work at €800 a day. After a 20-minute call you get a fixed price in writing.

How long does it take?

Most websites take 2–4 weeks, web apps 1–3 months. The written scope has the timeline.

Who does the work?

I do, from design to launch. No handoffs.

What happens after launch?

You own the code, the hosting and every account, so nothing is locked in. Support after launch can be part of the scope.

Do you use AI?

Yes, to move faster. I review every change myself before it goes live.

Can German companies hire you on contract?

Yes. I invoice as an independent business, with a written statement of work for each engagement.

Contact

Tell me what you need.

I reply within a day or two with a clear next step.

Prefer email? founder@partyx.infoPrefer a CV? One page, PDF