Founding · Engineering

Fullstack Engineer

Turn ideas into shipped software, end to end, at a pace that surprises people. Schema to pixel, whatever the week needs.

Apply €60,000–120,000 · equity · flexible location

Why Halcy?

Halcy is the platform for travelling with the people you love. Inspiring the initial idea. Co-creating the adventure with your group. Mapping it to the global travel ecosystem. Executing on it for you. Assisting you throughout the journey. Turning it into the memories that seed the next trip.

We want to bring more adventure into people's lives. We're looking for someone who shares that ambition, and who's excited to help build the company that delivers it.

Who you (probably) are

High on curiosity. Low on patience.
High on autonomy. Low on ego.
High tolerance for complexity. Low tolerance for repetition.
Suspicious of process. Religious about pace.
Speed to 80% equaled only by the drive to optimize the last 20%.

What you (ideally) bring

Must have
Our stack, or close to it. React, TypeScript, Tailwind, Postgres, Supabase edge functions. Production experience across most of it.
Mobile, iOS and Android. Capacitor or React Native, store submissions, TestFlight, signing, release builds.
You build with agents every day. You know their failure modes and when to intervene.
Speed to value. You pick up an unfamiliar API, domain or language and ship something real with it the same week.
Bonus
Consumer products. You have shipped to ordinary people, at consumer quality bars.
AI-native product work. LLM features in production: tool calling, streaming, evaluation, and the cost and latency mechanics that come with them.
Multiplayer applications. Realtime shared state, presence, conflict resolution.

What you will (mostly) do

Build the multiplayer, agentic layer travel has never had. A whole group editing one live plan while an AI books, rebooks and reasons on their behalf.

Ship features end to end, every week. Schema, edge function, UI, and the analytics to know whether it worked.

Meta-code. Most of our output goes through agents. Build the rules, commands and routines they run on, for your own leverage first and the team's after.

Know what could break before it does. Migrations that have to stay compatible with frozen TestFlight builds. RLS gaps. Provider rate limits. AI spend per user. You find these while they are still cheap.

Shrink the rest of the team's blind spot. Hold the whole system in your head, stay paranoid about one line of it, and go three layers down to sort it out when something smells wrong.

Pick your own work from what the product obviously needs. Nobody here will hand you a ticket.

Benefits

Compensation €60,000–120,000, calibrated to experience.
Equity Four-year vest with one-year cliff.
Location Flexible working location.
Ownership Real ownership over a domain from day one.
The work An opportunity to solve a universal and meaningful problem.

Apply

Apply here - we respond to every application within 5 working days.

What's your full name?

Where can we email you?

Where can we find you on LinkedIn?

Where can we see your code?

Optional but, for this role, the most useful thing you can send. GitHub, a live app, anything you took all the way to done.

Impress us - tell us about something you built or shipped that you're proud of.

Links to artifacts welcome.

Any questions for us?

Read our cultural manifesto →