UI/UX Engineer (Founding)

halcy; Stockholms kommun; Hybrid; SEK 850,000 - 1,200,000; Full time

Benefits offered by this job

Equity (four-year vest with a one-year

Job summary

Halcy is building an AI travel agent that orchestrates groups across flights, stays, rails and tickets in a shared itinerary. You will design the multiplayer AI interface, making a complex product feel obvious, with a focus on a cohesive user experience across screens.

Using React, TypeScript, Vite and a design system, you will ship weekly and ensure the product remains intuitive even as AI content streams in real time. This role is hybrid in Stockholm.

Qualifications

• Strong React and TypeScript for building interfaces
• Experience with design systems and component libraries
• Mobile-first mindset for on-device performance
• Ability to prototype and ship weekly in a fast-paced environment

Responsibilities

• Invent the multiplayer AI interface for a live planning app
• Own the look and feel across hundreds of screens and transitions
• Collaborate with engineers to ship weekly and refine based on real usage
• Design in code and ensure consistency with Tailwind and shadcn/ui

Skills

React

TypeScript

Tailwind

shadcn/ui

Motion

Tools

Vite

Supabase

Postgres

Mapbox

Capacitor

Job description

We're building an AI travel agent for groups: your coolest, most helpful friend, inside an app. Hal, our agent, turns a vague idea into a real trip. Not a chatbot that hands you suggestions, but an agent that orchestrates tools across flight, stay, rail and ticket inventory, for a whole group at once, in a shared itinerary everyone is editing in real time.

Multiplayer, generative and agentic interfaces have never been designed for travel. You get to invent them, and turn them into user intuition. Nobody here will hand you a spec.

What you will mostly do

Invent the interface for multiplayer AI: five friends, one live plan, and a model generating and rearranging it underneath them. Bring gusto to a category that has none, because travel interfaces are lists, filters and forms and Halcy should be something people show their friends unprompted. Make a genuinely complex product feel obvious. Own how Halcy feels, every screen and every transition. Design in code and ship every week, then watch real people use it and eliminate the hesitation. Set the craft bar for everyone who joins after you, engineers included.

Must have

Conceptual range: you can invent an entire interaction model from a blank canvas, discard it, and invent a better one, repeatedly. Taste, and the reasoning behind it, in a body of work where every screen looks considered. You build what you design, with React and TypeScript strong enough that you answer "can we do this?" by doing it. Command of a design system: Tailwind, shadcn/ui, motion, and the discipline to keep two hundred screens feeling like one product. Mobile-first instinct, because most of Halcy happens on a phone, one-handed, in a foreign city, on bad wifi.

Bonus

You have designed around generative output, where streaming, unpredictable, sometimes-wrong AI content breaks every static layout assumption. Multiplayer or realtime UX: presence, live edits, other people changing the thing you are looking at.

Our stack

React, TypeScript, Vite, Tailwind, shadcn/ui, Supabase and Postgres, Mapbox, Capacitor. We ship to App Store and Play Store.

What you get

• Salary calibrated to experience, in the range above.
• Equity, four-year vest with a one-year cliff.
• Hybrid in Stockholm.
• Permanent license to cook.

Full role description: https://halcy.site/careers/roles/ui-ux-engineer