Founding Engineer

Userlink ApS; Odense; On-site; DKK 700,000 - 1,000,000; Full time

Benefits offered by this job

Equity

Technical freedom

Job summary

Userlink ApS in Odense is seeking a seasoned backend engineer to join the brain of our platform. You will own data model, retrieval, evaluation and real-time flows that intervene in sessions, writing code, shipping features, and monitoring them in production for real customers.

We require hands-on experience building SaaS systems, strong Java or C#, and familiarity with React. Equity is offered, and you will help shape the company from day one.

Qualifications

• 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.
• AI-assisted development as part of the daily workflow.

Responsibilities

• Own parts of the brain from idea to production, including data model, retrieval and real-time flows.
• Write the code yourself, ship it and follow it when it meets real customers.
• Help decide what gets built, and how, shaping the foundation for the next engineers.
• Decisions are made on arguments, not titles.

Skills

Backend development

Java

C#

React

LLM features

Job description

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, and every conversation ends up as structured data on demand and purchase barriers. The team is based in Odense.

The brain

The agents are the arms. The next layer is a system that brings together every signal about a webshop and its customers: conversations on chat, email, phone and social, on-site behaviour, orders, returns and reviews.

The system identifies the moments where a sale is won or lost and intervenes while the session is still live. It 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, more than six million visits a month, where patterns become visible that no single shop has the traffic to see. Every intervention is measured against a control group. 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 under scrutiny.

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.

The work is not split into tickets in advance. You help decide what gets built, and how, and 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. 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

AI-assisted development as part of the daily workflow

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

Equity

Short decision paths and a high degree of technical freedom

Office at Storms Pakhus in Odense

Application process

We take the time it takes to find the right match.

Introductory conversation

Technical test

Conversation about expectations and terms