Software engineer

Cofactor; Stockholms kommun; On-site; SEK 850,000 - 1,200,000; Full time

Job summary

Cofactor in Stockholm is building an AI-powered platform to reshape how retailers and suppliers collaborate. We’re an early-stage team, excited by ambitious product work and fast feedback from real customers.

You’ll help build the core platform with the founding team, focusing on correctness, reliability, and scalable design. Expect hands-on work with TypeScript, LLMs in production, and integrations into enterprise systems.

Qualifications

• Strong generalist who owns problems, not tickets.
• Writes code others can build on and ensures correctness in money-moving systems.
• Has used LLMs for real work with guardrails.
• Familiar with TypeScript and LLM agents in production, or willing to learn.

Responsibilities

• Build the core platform—the workflow engine and data model underneath them.
• Put LLMs to work on commercial documents—extraction, validation and reconciliation.
• Build the integrations retail runs on—ERPs, pricing systems, email and EDI, where a write has to be right.
• Own features end-to-end—from design to production with customers using what you shipped within weeks.

Skills

TypeScript

LLM integration

End-to-end ownership

System correctness

Tools

ERP integrations

Pricing systems

Email/EDI

Job description

Engineering

• Full-time
• On-site
• Stockholm

Software Engineer

What we’re doing

We are reshaping how retailers and suppliers work together.

Today, these relationships are messy, manual, and full of friction. We’re building an AI platform to make collaboration simpler, smarter, and more efficient.

We’re an early-stage team in Stockholm with a lot of ambition and very little bureaucracy. We care deeply about what we’re building - and about building it with smart, curious, kind people who enjoy working together.

We’re building the product, the company, and the culture at the same time. There’s a lot to figure out, and a lot of room to make an impact.

The role

You’ll build the core platform with the founding team.

Cofactor reads commercial communication, validates it against agreements and business rules, and executes the result into the systems that already run the business. You’ll build the machinery that makes that trustworthy.

You Might

• Build the core platform - the workflow engine, the agent runtime, and the data model underneath them.
• Put LLMs to work on real commercial documents - extraction, validation and reconciliation, with human approval where it matters.
• Build the integrations retail runs on - ERPs, pricing systems, email and EDI, where a write has to be right.
• Own features end-to-end - from design to production, with customers using what you shipped within weeks.

You’ll be one of the first engineers, working directly with the technical co‑founder on architecture and product decisions.

Who we’re looking for

You’re a strong generalist who likes owning problems, not tickets.

You write code that other people can build on, and you care about correctness in systems where money moves.

You’ve used LLMs for real work - not just chat - and have a feel for what they’re reliable at and where they need guardrails.

Stack today: TypeScript end-to-end, LLM agents in production, integrations into enterprise systems. You don’t need to have used exactly that. You need to learn fast.

How we work

Mission first.

We focus on what moves the company forward.

Everyone ships.

Good ideas matter. Turning them into reality matters more.

Sharp, kind, low ego.

We care about doing excellent work without taking ourselves too seriously.

High trust, high ownership.

We give people responsibility and expect them to run with it.

Why join

Small team, hard problems, real customers. What you build goes into production at European retailers within weeks, not quarters.

You’ll shape the platform’s architecture while it’s still young enough to shape.