Senior Developer - AI & Fullstack

Litium; Stockholms kommun; Hybrid; SEK 800,000 - 1,100,000; Full time

Benefits offered by this job

Salary by agreement

Flexible working hours

30 days of vacation

Occupational pension (ITP) and insured

Wellness allowance SEK 5,000 per year

Office at Stockholm

Start date: by agreement

Job summary

Litium AB in Stockholm, Sweden is seeking a Senior Software Engineer who thrives on building real products across frontend, backend, and AI. You will work in a hybrid setup based in Sweden, collaborating with Product and Design to deliver high-quality experiences.

We expect deep knowledge of modern JavaScript/TypeScript, architecture and CI/CD, and a strong interest in AI-driven development. You’ll mentor others, shape technical direction, and own significant parts of the stack.

Qualifications

• Several years of experience as a developer with deep knowledge of modern JavaScript/TypeScript frameworks and backend technologies.
• Background in architecture, scalability, and CI/CD.
• Genuine curiosity about AI and hands-on experience with AI-assisted development.
• Structured approach to work; capable of moving between architectural thinking and detailed implementation.
• Clear communication and strong ownership in a fast-moving environment.

Responsibilities

• Fullstack development with React/NextJS, Angular, TypeScript, Node.js, .NET and cloud infrastructure.
• AI-driven development using AI tools and agents to boost output.
• Collaborate with Product and Design to deliver high-quality user experiences.
• Take technical ownership and mentor others.
• Drive architecture decisions, code quality, testing and performance.

Skills

JavaScript/TypeScript

Frontend frameworks

Backend technologies

Architecture & CI/CD

AI curiosity

Communication & ownership

Tools

React

Next.js

Angular

TypeScript

Node.js

.NET

CI/CD

Job description

Help us build great products – and shape the future of modern commerce

At Litium, we’re on a mission to help our customers succeed in modern commerce, building the capabilities they need to grow their business online, connect systems and channels, and use AI as a foundation for smarter, faster decisions.

We’re now expanding our engineering team in Sweden to lead the way forward.

We’re looking for a Senior Software Engineer who thrives on building real products, enjoys working across backend, frontend, and AI, and wants to be part of a fast‑moving team where architecture, quality, and user experience matter.

What you’ll work on

• Fullstack development: React/NextJS, Angular, TypeScript, Node.js, .NET, cloud infrastructure and everything in between

• AI-driven development: you'll work with and through AI tools and AI agents to multiply your output, and help us improve how we use them

• Product building: work closely with Product and Design to deliver high‑quality user experiences

• Take technical ownership: contribute to architectural decisions, and mentor others.

• Technical quality: you'll drive architecture decisions, code quality, testing and performance, and raise the bar for the whole team through code reviews and knowledge sharing

What we’re looking for

• Several years of experience as a developer, with deep knowledge of modern JavaScript/TypeScript frameworks and backend technologies

• Background in architecture, scalability, and CI/CD

• Genuine curiosity about AI and how it's changing software development, ideally with hands‑on experience of AI‑assisted development

• You work in a structured way and understand that high speed requires order, not chaos

• You can move between architectural thinking and detailed implementation

• You communicate clearly, take ownership and thrive in a fast‑moving environment

What we offer

• Salary by agreement, based on experience and skills

• Flexible working hours

• 30 days of vacation

• Occupational pension (ITP) and insurance under the collective agreement

• Wellness allowance of SEK 5,000 per year

• Office at Hammarbybacken 27, Stockholm

• Start date: by agreement

Practical info

• Location: Hybrid, based in Sweden. Regular time in Stockholm office is expected.

• Language: Since most of our customers are based in Sweden, Swedish language skills are required.