Senior Full-Stack Engineer Engineering · Copenhagen

Proper ApS; København; On-site; DKK 50,000 - 65,000; Full time

Benefits offered by this job

Equity

Daily lunch included

Copenhagen office (centrally located)

Job summary

Rumli is building a full-service proptech platform powered by AI-native technology, serving landlords and tenants with seamless workflows and automated operations. The team emphasizes real customers, production-grade AI agents, and a scalable product architecture in a Nordic expansion plan.

You will shape the architecture of a greenfield platform, own features end-to-end—from database to API to UI—and ship fast with prototypes, while scaling across the Nordics and building AI into core product

Qualifications

• Strong TypeScript/Node.js proficiency with practical experience in full-stack development.
• Experience with AWS and modern frontend frameworks is required.
• Ability to design and ship features end-to-end in a fast-growing product.

Responsibilities

• Work directly with our co-founder to shape the platform architecture.
• Own features end-to-end — database to API to UI.
• Ship fast with mockups, prototypes, and iterations.
• Make architectural decisions scalable across the Nordics.
• Integrate AI into core product features.

Skills

TypeScript/Node.js

Full-stack development

AWS

Coding agents

Product thinking

Independent work

Copenhagen on-site

Tools

NestJS

PostgreSQL

Drizzle ORM

Next.js

React

Shadcn

Tailwind CSS

AWS Lambda

CDK

RDS

EventBridge

SQS

Job description

A property manager can handle 200 tenants. That’s the industry limit. Why? Because the work scales linearly: matching bank transactions to invoices, chasing late payments, answering tenant questions, coordinating repairs, preparing legal notices, renewing leases. More tenants, more of the same manual work.

With AI, that limit disappears. And both landlords and tenants get a better experience.

About Rumli

Eight years in property operations. ~1,000 customers across Denmark, Netherlands, and Germany. We know this industry — the workflows, the pain points, the regulations.

Now we’re making a big move: becoming a full-service property operator. Tenant communication, bookkeeping, coordinating repairs — we handle it. A landlord shouldn’t chase late payments or find a plumber at 10pm. We do it for them.

We’re building an entirely new platform to power this. AI-native from day one. Profitable, real customers, expanding across the Nordics.

Why this is interesting

We’re shipping production software with AI agents as part of the development workflow. Not a side experiment — this is how we build.

Our codebase has custom Claude Code skills. AI writes code, we review it. AI runs tests, we verify. We’re figuring out what it means when your most productive team member isn’t human.

The product side is equally interesting. Property management is perfect for AI: thousands of similar transactions, pattern-based decisions, templated documents. Years of domain knowledge ready to encode into intelligent systems.

The role

You’ll shape the architecture of a platform being built from scratch.

• Work directly with our co-founder

• Own features end-to-end — database to API to UI

• Ship fast — mockups, prototypes, iteration

• Make architectural decisions that scale across the Nordics

• Build AI into core product features

This isn’t a ticket-taker role. We need someone who looks at messy problems and figures out what to build.

Tech stack

TypeScript everywhere.

• Backend: NestJS, PostgreSQL, Drizzle ORM

• Frontend: Next.js, React, Shadcn, Tailwind CSS

• Infra: AWS Lambda, CDK, RDS, EventBridge, SQS

TypeScript and AWS experience required. The rest you’ll pick up.

What we’re looking for

• Strong TypeScript/Node.js

• Full-stack (backend + React)

• AWS experience

• Coding agents experience

• Product thinking — understand problems, not just requirements

• Work independently

• Copenhagen-based (on-site)

Big plus: AI experience (prompt engineering, RAG, agents), fintech/proptech background.

Compensation & benefits

• Compensation: 50–65K DKK, depending on experience and demonstrated competencies

• Equity: Employee warrants offering real ownership in the company

• Workspace: Centrally located Copenhagen office

• Perks: Daily lunch included

Why Rumli?

Real customers. Brand-new codebase. Small team where your decisions matter.

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