Founding Engineer

Userlink; Odense; Hybrid; DKK 900,000 - 1,300,000; Full time

Benefits offered by this job

Competitive salary

Equity

Short decision paths

Office in Odense

Job summary

Userlink, based in Odense, seeks a founding engineer to join early in building the brain of our platform. You will own parts from idea to production, focusing on data models, retrieval, evaluation, and real-time session interventions across SaaS systems.

Ideal candidates have backend strength in Java or C#, comfort with React, and experience shipping LLM-based features. Equity is offered as we grow together and take ownership of what we build.

Qualifications

• Experience building and running SaaS systems in production.
• Strong backend development in Java or C#, with React experience.
• Experience building LLM-based features and measuring their impact.
• Owns what they build and is accountable in production.

Responsibilities

• Owns parts of the brain from idea to production: data model, retrieval, evaluation and real-time flows.
• Write code, ship features, and monitor performance with real customers.
• Collaborate closely with founders, sales, and customers to decide what to build and how.
• Ensure changes deliver measurable revenue impact for hundreds of webshops.

Skills

SaaS production

Java/C# backend

React

LLM features

Ownership

AI-assisted dev

English fluency

Job description

Founding Engineer

Full-time Java React LLM Odense Equity

About Userlink

Userlink runs AI agents in production at several hundred Nordic webshops, including Bahne, XL-BYG, Coolshop and Bygma. The agents handle the customer dialogue before and after the purchase, across more than six million visits a month, and every conversation ends up as structured data on demand and purchase barriers. Webshops pay for it every month, and the ones that use it stay. The team is based in Odense, and we already have customers and partners in DACH and the Netherlands.

Why the next two years matter

Today webshops buy Userlink as chat. Email is rolling out now, and phone and social follow. On top of that we are building the brain: a system that brings together every signal about a webshop and its customers, understands why people buy and why they do not, and acts on it while the buyer is still on the page. Every intervention is measured against a control group, so the shop sees the effect in revenue, not in a satisfaction score.

That changes what we sell. Userlink moves from a customer service tool to a product that demonstrably grows the shop's revenue, and revenue per customer can become several times what it is today. Nobody has built that layer for e-commerce yet. You are one of the people who builds it.

What you build

The agents are the arms. The brain is the next layer: it identifies the moments where a sale is won or lost and intervenes while the session is still live, scores answer coverage per product and closes the gaps, quantifies objections and unmet demand, and traces returns back to the expectation that broke. Learning happens across all webshops, where patterns become visible that no single shop has the traffic to see. The patterns are shared, the data stays with each shop.

The hard problems are retrieval and evaluation of LLM output at scale, data isolation when patterns are shared across customers, latency in real-time flows, and attribution that holds up when a CFO asks. Each of them is a commercial problem too: an agent that answers wrong costs the shop a sale, and an uplift nobody trusts does not get paid for.

The stack

Java with Spring Boot, React and MongoDB, with language models and vector search on top. Moving the backend to C# and .NET is under consideration.

The role

You are one of the first engineers on the brain and own parts of it from idea to production: data model, retrieval, evaluation and the real-time flows that intervene in the session. You write the code yourself, ship it and follow it when it meets real customers. What you ship lands at hundreds of webshops within weeks, and you can see in the numbers whether it made them sell more.

The work is not split into tickets in advance. You sit close to the founder and to sales, you hear what customers pay for and what they ask for, and you help decide what gets built, and how. Your choices become the foundation the next engineers build on.

Decisions are made on arguments, not titles. Ideas get challenged regardless of where they come from, and the best one wins.

Why founding

You come in while the brain is taking shape. There is no finished architecture to follow, and the choices you make now are the ones everyone after you builds on.

That is why the role comes with equity. You help build the company, and you own part of what you build. The equity is worth what the company becomes, and the brain is the biggest lever on that. In return we expect you to take responsibility like a co-owner, also when things are unclear or go wrong.

Profile

• Experience building and running SaaS systems in production
• Solid backend experience in Java or C#, and comfortable in React
• Has built LLM-based features and knows how to measure whether they work
• Owns what they build, also when it breaks in production
• Cares whether the thing they built made the customer money, not only whether it is elegant
• AI-assisted development as part of the daily workflow
• Fluent English is mandatory. English is the office language at Userlink

The person

• Dreams of owning and building a company
• Ideally has tried starting something and knows what it takes
• Thinks like a founder, not an employee
• Happily gives more than a regular job asks for, because it is fun
• Says things as they are, and can take the same in return
• Takes ownership and looks for solutions rather than excuses
• Curious, learns fast and has a positive mindset

What we offer

• Competitive salary
• Equity
• Short decision paths and a high degree of technical freedom
• Office at Storms Pakhus in Odense

Contact

Phone: [phone]

Email: [e-mail]

Userlink ApS

Ejlskovsgade 13

5000 Odense

VAT no.: 44867079

© 2026 userlink.ai Terms and Conditions Privacy Policy