Software Engineer and a Game Changer-

Barona Professionals AB; Stockholms kommun; Hybrid; SEK 700,000 - 900,000; Full time

Benefits offered by this job

Excellent benefits

Job summary

St1 is seeking an experienced Software Engineer to join the Software Engineering team driving the energy transition through AI-enabled software. You will work with business stakeholders, architects, and AI agents to design, implement, test, and deliver scalable solutions across multiple domains.

Bring hands-on AI experience, a strong backend focus, and a track record with microservices, cloud, and modern frontend frameworks.

Qualifications

• Hands-on AI in development with experience using AI tools.
• Solid experience with microservices and distributed systems.
• Full-stack background with a strong backend focus.
• Strong skills in Node.js (NestJS), TypeScript, .NET Core, C#; Next.js/React/Vue.js a plus.
• Experience with Google Cloud, CI/CD, and DevOps.
• Knowledge of architecture patterns such as DDD, SOLID, Hexagonal Architecture, and MVC.
• Ability to write clean, testable, and maintainable code.
• Hands-on experience with AI building blocks such as LLM APIs, RAG, vector databases, embeddings, agent frameworks.
• Strong communication skills and the ability to work with both technical and non-technical stakeholders.
• 6+ years of software development experience.
• Professional English; Nordic language skills are a plus.

Responsibilities

• As a Software Engineer, you will design, implement, test, and maintain scalable software solutions.
• Collaborate with business stakeholders, architects, and AI agents from requirements analysis through delivery.
• Build AI-enabled development tools and workflows and help shape AI-native ways of working.
• Contribute technical leadership and improve engineering practices across teams.
• Challenge existing approaches and evaluate emerging technologies for sustainable solutions.
• Work in a forward-deployed delivery team connecting technical possibilities with business needs.

Skills

Node.js (NestJS)

TypeScript

.NET Core

C#

Next.js

React

Vue.js

Google Cloud

CI/CD

DDD / SOLID / Hexagonal

ML/AI building blocks

English

Nordic language skills

Education

Bachelor's degree in Computer Science or Software Engineering

Tools

Docker

Kubernetes

Git

Job description

Software Engineer – Building Software for the Energy Transition in the Age of AI

We are looking for an experienced Software Engineer to join St1’s Software Engineering team — a team operating at the intersection of energy transition and modern software development.

We build and operate software products and solutions across multiple business domains, owning the full lifecycle from idea to production. Whether it is charging or fueling your car, enabling an automated car wash, or tracking how used cooking oil becomes sustainable biofuel, the software behind these experiences is built by our team.

This role is for an engineer who enjoys working close to the business while bringing strong technical expertise. You will collaborate with business stakeholders, architects, and technical specialists from early discovery and solution design through implementation and delivery. You are comfortable translating business needs into technical solutions and challenging assumptions when needed.

Building software in the age of AI

At St1, AI is more than a coding assistant. We are exploring how software engineering should evolve in an AI-enabled world.

You will help shape new ways of working by building AI-integrated development pipelines, experimenting with agents, and exploring effective collaboration between humans and AI. We expect hands‑on experience with modern AI tools, an understanding of their strengths and limitations, and curiosity to explore what comes next.

How you’ll help drive the change

As a Software Engineer, you will:

• Work in a forward‑deployed delivery team, connecting technical possibilities with business and customer needs.
• Collaborate with stakeholders, architects, technical specialists, and AI agents from requirements analysis through delivery.
• Design, implement, test, and maintain scalable software solutions.
• Contribute technical leadership and improve engineering practices across teams.
• Build AI‑enabled development tools and workflows and help shape AI‑native ways of working.
• Challenge existing approaches and evaluate emerging technologies to ensure sustainable solutions.

What you bring to the team

To succeed in this role, you likely have:

• A strong software engineering foundation with hands‑on experience using AI in development. You have built with AI tools, understand their limitations, and want to explore their future potential.
• Solid experience with microservices and distributed systems.
• A full‑stack background with a strong backend focus.
• Strong skills in Node.js (NestJS), TypeScript, .NET Core, and C#. Experience with Next.js, React, or Vue.js is a plus.
• Experience with Google Cloud, CI/CD, and DevOps practices.
• Understanding of architecture patterns such as DDD, SOLID, Hexagonal Architecture, and MVC.
• Ability to write clean, testable, and maintainable code in both new and existing systems.
• Hands‑on experience with AI building blocks such as LLM APIs, RAG, vector databases, embeddings, agent frameworks, and standards such as MCP.
• Strong communication skills and the ability to work effectively with both technical and non‑technical stakeholders.
• A proactive, collaborative, and solution‑oriented mindset.
• 6+ years of software development experience.
• A degree in Computer Science, Software Engineering, or equivalent experience.
• Professional English skills; Nordic language skills are a plus.

Who are we looking for?

We are looking for people who recognize the St1 Spirit: Curious, Commercial, Committed, and Caring.

This means creating an environment where people can be themselves, raising challenges early, taking ownership when things get difficult, thinking beyond team boundaries, and continuously learning as technology evolves.

Bring your experience, your perspective, and your ambition. Tell us what you can do — and what you want to build next.

Why join St1?

• Shape how St1 builds software in the age of AI.
• Create impact through products and services used by millions every day.
• Grow your career in software architecture, AI, data, or technical leadership.
• Work with a talented Nordic engineering community.
• Enjoy a culture built on trust, freedom, and responsibility.
• Work from Helsinki or Stockholm with excellent employee benefits.
• Contribute to St1’s vision of a more CO₂‑aware energy future.

How we support your journey

At St1, your safety and wellbeing come first. We offer an inclusive, trust‑based culture where you are encouraged to take ownership, explore ideas, and grow. You will have opportunities to collaborate across teams and countries, develop your skills, and contribute to meaningful technology solutions.

We offer competitive compensation, strong benefits, and an environment where your contribution matters.

What to expect after you apply

We welcome applicants from all backgrounds and are committed to an inclusive and equitable recruitment process.

Interested? Submit your CV and cover letter through the Barona Career site by Thursday, 14 August 2026.

For more information, please contact us during the August calling hours: Tuesday, 4 August, or Thursday, 6 August 2026, between 12:00 and 14:00.

Contact person

Barona Recruitment Team Lead Lassi Jyrinsalo

Phone: [phone]

Email: [e-mail] (mailto:[e-mail])

Let’s challenge the ordinary.

INDTECH