Fouding engineer

Stealth Startup; Amsterdam; On-site; EUR 120,000 - 180,000; Full time

Benefits offered by this job

Founding equity

Competitive salary

Amsterdam on-site

Job summary

Stealth Startup is building the first lines of code for an agent-driven platform in healthcare. You join the founding team to shape the product, architecture and culture, with equity to match and a pivotal role in defining how we scale.

We focus on reliability, privacy, and safe integrations with EHR and telephony. You will own critical components, drive speed and quality, and help turn a bold vision into a working system, on-site in Amsterdam.

Qualifications

• 3+ years shipping production software that you owned.
• Strong TypeScript and Node.
• Real experience building with LLMs: tool use, agent loops, and evals you trusted enough to block a release.
• Experience making unreliable third-party systems behave reliably.
• Daily use of coding agents, and a clear sense of where they break.
• Product judgment and the drive to build a company from the ground up.

Responsibilities

• You join the founding team and help shape the product, architecture and culture from the first lines of code, with equity to match.
• You own reliability: ensure demos work, bookings reach the calendar, and consent/guardrails are respected.

Skills

TypeScript

Node.js

LLMs

Reliability

Agent frameworks

Product judgment

Job description

Every business runs on hard work: answering phones, chasing documents, booking, reminding, following up. Within a few years, agents will do most of it. We are building the operating system that makes that happen.

We start in specialty healthcare, where the work is hardest and the stakes are highest. Our agents already answer phones, call patients, book appointments and handle crucial communication in clinics today. They finish the work across EHRs, practice management systems, telephony and messaging, and show every step they took. If it works in a clinic, it works anywhere.

From there we expand clinic by clinic and vertical by vertical, until businesses across Europe and the US run on us. Agentic software is the next platform shift, and we intend to be at the front of it.

The founders have done this before. Between them they have started three successful companies, raised more than 25 million and served millions of customers. One brings deep access to the healthcare sector. Another built a European AI company to more than 100 people and profitability. We grow fast and capital efficiently: revenue first, a small senior team, and as much leverage from AI as possible. We are deliberately under the radar for now. That will not last long.

The role

You join the founding team. You help shape the product, the architecture and the culture from the first lines of code, with the equity to match.

In healthcare, a demo that works 90% of the time is a liability. A booking that never reached the calendar means a patient misses care. A message sent without consent is a compliance incident. Reliability is the product, and you own it.

You build two things:

• The factory. Agent loops that take a spec to a tested pull request, evals that decide what ships, and agents that review other agents. Speed matters, but nothing merges without proof that it works.
• The product. The agent platform clinics run on: workflow orchestration that recovers when a call drops or an API fails, integrations with EHR, practice management, telephony and messaging systems, deterministic guardrails for consent, escalation and write-backs, and monitoring that catches failures before a clinic does.

What you bring

• 3+ years shipping production software that you owned, including being responsible when it broke
• Strong TypeScript and Node
• Real experience building with LLMs: tool use, agent loops, and evals you trusted enough to block a release
• Experience making unreliable third-party systems behave reliably
• Daily use of coding agents, and a clear sense of where they break
• Product judgment and the drive to build a company from the ground up

Nice to have: voice AI or telephony, FHIR, HL7 or EHR integrations, early-stage startup experience, Dutch.

What we offer

• Founding equity and a competitive salary
• A seat at the founding table: you decide how we build, who we hire next and how engineers work alongside agents
• Amsterdam, on-site, working with the latest models and tools