Senior Fullstack & AI Engineer

Digital Fans AB; Stockholms kommun; On-site; SEK 700,000 - 900,000; Full time

Job summary

Digital Fans AB is seeking a Fullstack and AI Developer to build digital products where software development and AI converge. You’ll work across the stack with TypeScript/React to create client-facing apps, dashboards and AI-powered workflows.

You’ll collaborate with design and clients to deliver production-ready solutions, shipping observable, scalable AI components and robust integrations across systems like Shopify, Azure, and CMS platforms.

Qualifications

• 5+ years of professional software development experience.
• Strong experience with frontend and modern web development.
• Deep experience with TypeScript and React.
• Experience with frameworks such as TanStack Start, React Router or Next.js.
• Comfortable working across the full stack, including Node.js, APIs, integrations and data.
• Hands-on experience building and shipping LLM-powered features such as tool calling, RAG or agentic workflows.
• Experience with an agent framework or SDK such as Mastra, OpenAI Agents SDK, Claude Agent SDK or LangGraph.
• Experience shipping production applications and working with modern development infrastructure.
• Experience with headless CMS platforms, Shopify, Azure, Docker and Cloudflare is a plus. Experience with Mastra and Amazon Bedrock AgentCore is also a plus.

Responsibilities

• Build client-facing web applications and digital products in TypeScript and React.
• Develop products using TanStack Start, React Router and Next.js.
• Turn designs and user experiences into high-quality, responsive digital products.
• Build LLM-powered features and agent workflows and integrate them into real product experiences.
• Connect AI systems to client data, tools and platforms.
• Work with headless CMS platforms and e-commerce solutions such as Shopify.
• Build APIs, integrations and backend functionality when needed.
• Prototype new AI-powered solutions quickly and turn the strongest ideas into robust production services.
• Build AI components that are observable, testable and cost‑aware.
• Contribute to technical architecture and how we develop our AI capabilities.
• Take ownership of solutions from early exploration to production.
• Work closely with design to create digital experiences where technology and AI feel like one product.
• Collaborate directly with clients and stakeholders to understand real business and user needs.
• Share knowledge and contribute to how the wider team builds with AI.

Skills

TypeScript

React

Frontend development

Full-stack development

LLM-powered features

API integrations

English fluency

Modern development practices

Tools

TanStack Start

React Router

Next.js

Node.js

Mastra

OpenAI Agents SDK

Claude Agent SDK

LangGraph

Shopify

Azure

Docker

Cloudflare

Amazon Bedrock AgentCore

Job description

Digital Fans AB is seeking a Fullstack and AI Developer to build digital products where software development and AI converge. You’ll work across the stack with TypeScript/React to create client-facing apps, dashboards and AI-powered workflows.

You’ll collaborate with design and clients to deliver production-ready solutions, shipping observable, scalable AI components and robust integrations across systems like Shopify, Azure, and CMS platforms.