Founding Full Stack Developer

Praetori; Haarlem; Hybrid; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Equity

Market-rate salary

Job summary

Praetori in Haarlem, the Netherlands is seeking a full-stack engineer to design and ship core features that stay fast under pressure. You’ll own architecture, interfaces, data flows and performance, building scalable systems that keep critical operators productive.

Work with product, design, and forward-deployed engineers to deliver interfaces in TypeScript, React and Next.js, and backend services in Node.js. You’ll ensure the product remains legible and reliable as it grows.

Qualifications

• You built production systems that are fast and reliable.
• Strong TypeScript/React/Node.js experience and shipping production software.
• Excellent architectural judgement and a focus on UX outcomes.

Responsibilities

• Design and build core product features end to end, from data model and API to interface.
• Build interfaces in TypeScript, React and Next.js that stay clear and responsive under pressure.
• Design backend services and APIs in Node.js that are correct, observable and fast.
• Make architecture decisions that keep the system scalable and the codebase pleasant to build on.
• Treat performance as a feature; latency, responsiveness and reliability are part of the product.
• Bring product thinking; help decide what to build and why, not only how.
• Work with design to turn complex operational workflows into interfaces that feel inevitable.
• Harden field prototypes from forward deployed engineers into production-grade features.

Skills

Ownership

Product thinking

UX focus

English fluency

Tools

TypeScript

React

Next.js

Node.js

APIs

Performance profiling

Job description

Haarlem, the Netherlands · Full-time · Hybrid

Praetori builds Continuous Control Infrastructure to secure Europe's operational independence. We are looking for a full stack engineer who builds software that stays clear, fast and dependable when the people using it are under real pressure.

ABOUT PRAETORI

Praetori builds Continuous Control Infrastructure: one sovereign software layer that keeps the operational picture, the decision and the action connected while conditions change.

Operations move continuously. Most systems do not. When information fragments across tools and the situation shifts faster than the response, control is lost. Praetori closes that gap, so critical teams understand, decide and act as one, and hold sovereign control when external dependencies fail.

Our mission is to secure Europe's operational independence.

ABOUT THE ROLE

The interface between an operator and the system is where our software earns trust or loses it. Our users make consequential decisions in compressed time, often in degraded conditions. The product has to make the right action obvious, absorb complexity on their behalf, and never get in the way. That standard runs from the pixel to the data model.

You own significant parts of the product end to end: architecture, interfaces, data flows and performance. You build systems that scale and interfaces that stay legible under stress, and you move quickly without letting quality slip. You work with product, design, forward deployed engineers and infrastructure.

Within twelve months, you will have shipped core product operators choose because it is clearer and faster than anything else on their screen, built an architecture that keeps the team shipping quickly as the product grows, and made performance and reliability strengths of the product rather than complaints.

WHAT YOU'LL DO

• Design and build core product features end to end, from data model and API to interface.
• Build interfaces in TypeScript, React and Next.js that stay clear and responsive under pressure.
• Design backend services and APIs in Node.js that are correct, observable and fast.
• Make architecture decisions that keep the system scalable and the codebase pleasant to build on.
• Treat performance as a feature. Latency, responsiveness and reliability are part of the product.
• Bring product thinking. Help decide what to build and why, not only how.
• Work with design to turn complex operational workflows into interfaces that feel inevitable.
• Harden field prototypes from forward deployed engineers into production-grade features.

WHAT WE'RE LOOKING FOR

Required

• You can point to a production system you built end to end that people use daily, and the calls you made to keep it fast.
• Deep TypeScript expertise across the stack, with strong React and Next.js on the front end.
• Solid backend engineering in Node.js: APIs, data modelling and services built to last.
• A record of shipping production software that is genuinely fast, reliable and well-crafted.
• Sound architectural judgement. You keep systems simple as they scale.
• Real care for UX and product outcomes, not just code that compiles.
• High ownership and high standards, even under deadline. Fluent English.

Preferred

• Experience with complex, data-dense or real-time interfaces: dashboards, operational tooling, mapping, monitoring.
• Background in high-reliability software where failure carries real consequences.
• Depth in performance engineering, or in design systems and interface craft.
• Interest in the mission: defence, security and critical infrastructure.

WHY JOIN PRAETORI

Europe can no longer assume that the systems its critical organisations depend on will stay available, trusted, or under its own control. Praetori exists to change that. You would help build the sovereign infrastructure that secures Europe's operational independence, from the ground up.

The problems are hard and the ownership is real. You would work alongside the founders and a small, deliberately chosen team, with room to grow as the company does and the rare chance to shape foundational systems before they exist. If you have felt the cost of losing control, this is where you rebuild it.

OUR STANDARDS

We work with extreme ownership and low ego. We hold a high bar, first for ourselves, and we separate ideas from identity so we can argue hard and decide fast. We favour action over deliberation, say the true thing plainly and early, and put the mission ahead of comfort or hierarchy. Status here is earned by what you build, not your title.

PRACTICALITIES

ContractFull-time.

LocationHaarlem, the Netherlands. Hybrid, with regular time on-site.

TravelMinimal

CompensationA market-rate salary and meaningful equity.

EligibilityRight to work in the EU. Willingness to undergo security screening.