Senior Full-Stack Engineer

Rumli; Københavns Kommune; On-site; DKK 50,000 - 65,000; Full time

Benefits offered by this job

Daily lunch included

Centrally located Copenhagen office

Employee equity options

Job summary

Rumli is seeking a Full-Stack Developer in Copenhagen to build a new AI-native property management platform. You’ll work directly with the co-founder and take ownership of features from database to UI.

The ideal candidate has strong TypeScript expertise and AWS experience. You will be responsible for architectural decisions and implementing AI into the product. The role offers an interesting compensation package of 50–65K DKK, equity options, and daily lunches.

Qualifications

• Strong experience in TypeScript and Node.js.
• Ability to develop full-stack applications.
• Experience with AWS cloud services.

Responsibilities

• Shape the architecture of the new platform.
• Own features end-to-end — from database to API to UI.
• Make architectural decisions for scalability.

Skills

Strong TypeScript/Node.js

Full-stack (backend + React)

AWS experience

Coding agents experience

Product thinking

Work independently

Tools

NestJS

PostgreSQL

React

Next.js

AWS Lambda

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.

We’re rebuilding from the ground up with AI as the foundation. If you want to shape property tech at scale and see what software development looks like when AI is a real collaborator — reach out.

Interesting career path? Don’t tick every box? Reach out anyway.