AI Developer

Digital Fans AB; Stockholms kommun; On-site; SEK 600,000 - 900,000; Full time

Job summary

Digital Fans AB in Stockholm is seeking an AI Developer to build LLM-powered features and agent workflows that move beyond experiments and integrate with clients' data and tools.

You will work with senior leadership and designers to turn ideas into reliable, production-ready AI solutions using Mastra and a TypeScript-based stack. The role emphasizes practical problem solving, data integration, and continuous improvement in a fast-moving AI landscape.

Qualifications

• 2+ years of professional software development experience.
• Strong experience with TypeScript and Node.js.
• Hands-on experience building LLM-powered features or applications.
• Experience with prompt design, tool calling, structured outputs and streaming.

Responsibilities

• Build LLM-powered features and agent workflows.
• Develop tools, memory, multi-step orchestration and human-in-the-loop flows.
• Integrate models from OpenAI, Anthropic, Google and other providers.
• Connect agents to client data sources, CRMs, content platforms and marketing tools.
• Build RAG pipelines and work with embeddings, retrieval and context.
• Develop integrations that connect AI capabilities with existing systems and workflows.
• Build product experiences around AI capabilities with fullstack developers and designers.
• Develop evals, monitoring and feedback loops to measure and improve AI behavior.
• Prototype new ideas quickly and turn successful concepts into robust production services.
• Continuously explore new capabilities across the AI/agent ecosystem.
• Work closely with leadership to turn direction into working solutions.
• Share learnings and contribute to how the wider team builds with AI.

Skills

TypeScript

Node.js

LLM-powered features

Prompt design

Tool calling

Embeddings/RAG

APIs integration

Mastra familiarity

Tools

Mastra

OpenAI API

Claude Agent SDK

LangGraph

Vercel AI SDK

Bedrock AgentCore

Job description

About the role

As an AI Developer at Digital Fans, you build AI-powered products and workflows that do real work for our clients. We work with companies to move beyond isolated AI experiments and build solutions that are integrated with their data, systems, brand context and existing ways of working. This can include everything from content and campaign automation to data analysis, internal tools and customer-facing assistants.

Your focus will be on turning ideas and use cases into working solutions. You will build LLM-powered features, agents and automated workflows, working closely with senior technical and product leadership as well as developers, designers and strategists.

Our core framework is Mastra and our main development language is TypeScript, but we care more about how you think about AI systems and how you turn emerging technology into useful, reliable solutions than which specific framework you have worked with before.

What you’ll do

• Build LLM-powered features and agent workflows
• Develop tools, memory, multi-step orchestration and human-in-the-loop flows
• Integrate models from OpenAI, Anthropic, Google and other providers
• Connect agents to client data sources, CRMs, content platforms and marketing tools
• Build RAG pipelines and work with embeddings, retrieval and context
• Develop integrations that connect AI capabilities with existing systems and workflows
• Build product experiences around AI capabilities together with fullstack developers and designers
• Develop evals, monitoring and feedback loops so AI behaviour can be measured and improved
• Prototype new ideas quickly and turn successful concepts into robust production services
• Continuously explore new capabilities across the fast-moving AI and agent ecosystem
• Work closely with senior technical and product leadership to turn direction and priorities into working solutions
• Share learnings and contribute to how the wider team builds with AI

Experience

• 2+ years of professional software development experience
• Strong experience with TypeScript and Node.js
• Hands-on experience building LLM-powered features or applications
• Experience with prompt design, tool calling, structured outputs and streaming
• Experience with a modern agent framework or SDK such as Mastra, OpenAI Agents SDK, Claude Agent SDK, LangGraph or Vercel AI SDK
• Understanding of embeddings, vector stores, retrieval and RAG
• Experience integrating applications with external data sources, APIs or platforms
• Experience with Mastra, Amazon Bedrock AgentCore and cloud environments is a plus

Who you are

• You are a hands-on builder who enjoys turning ideas into working solutions
• You are deeply curious about AI and follow how the technology and ecosystem are evolving
• You start with real client and user problems rather than technology for its own sake, and enjoy applying new capabilities to real problems rather than demos
• You have a strong software development foundation and care about turning AI into reliable products and workflows, balancing experimentation and speed with reliability, safety and maintainability
• You are comfortable working in an area where the best approaches are still evolving
• You learn quickly, move from prototyping to testing in real contexts, and ask for input when it helps you move forward
• You enjoy working closely with people from different disciplines — developers, designers, strategists and project leads
• You are comfortable working across multiple projects and ready to take increasing ownership as your experience and our AI capabilities grow
• You are fluent in English, written and spoken

About Digital Fans

Digital Fans is a digital growth partner based in Stockholm. We work at the intersection of strategy, design, technology, data and AI to build digital products, platforms and solutions that create measurable growth and efficiency for well-known Nordic and international brands.

We are a small, senior team where developers work closely with designers, strategists and other specialists, with short decision paths and real influence over what we build. As part of NORD DDB, we combine the pace and collaboration of a smaller team with the reach of a larger network.