Senior Software Engineer

STARK Group; Aarhus; On-site; DKK 950,000 - 1,200,000; Full time

Job summary

STARK Group is seeking a Senior Backend Engineer in Aarhus to drive the evolution of our Sales application, powering B2B growth across our stores. You will craft scalable, cloud-native backend services, champion clean architecture, and mentor the team to raise engineering standards.

You will work at the heart of our digital transformation, blending hands-on engineering with architectural thinking to move from legacy constraints to modern, composable systems.

Qualifications

• 5–10 years of professional software development experience.
• Strong experience in C# and the .NET ecosystem.
• Experience building microservices and distributed systems in cloud environments (Azure).
• Hands-on with event-driven architectures and messaging systems (Kafka).
• Relational databases knowledge, specifically PostgreSQL.
• Strong practices: Clean Architecture, DDD, SOLID, automated testing.

Responsibilities

• Lead the design and implementation of robust backend services powering the B2B sales experience.
• Strengthen system reliability and performance for in-store users.
• Evolve microservice and event-driven architecture with Kafka integrations and core services like Pricing.
• Champion clean architecture and rigorous testing to safeguard long-term health.
• Mentor junior developers through code reviews and set engineering bar.
• Ensure high data integrity and performance in PostgreSQL databases.

Skills

C#/.NET

Microservices

Cloud (Azure)

Event-driven

Kafka

PostgreSQL

DDD

SOLID

Automated testing

Tools

Kubernetes

Argo

Grafana

Job description

Empower our stores to drive B2B growth through a world-class Sales application

Join us as our new Senior Backend Engineer and come play a pivotal role in evolving the Sales application - the critical engine that enables all our stores to sell to B2B customers across the STARK Group.

You will join a team at the heart of our commercial digital transformation. In this role, you won’t just be writing code; you will be building the scalable architecture that allows our business to handle complex B2B sales flows, ensuring that our stores have the reliability and performance they need to serve professional craftsmen effectively.

You will blend deep hands-on engineering with architectural thinking, helping us transition from legacy constraints to a modern, composable, and cloud-native landscape.

What You'll Be Doing

You will take a senior role in the continued development of the Sales application, working closely with fellow engineers, architects and business stakeholders to turn complex B2B requirements into technical solutions.

Within your first 6–12 months, you will, among other things:

• Lead the design and implementation of robust backend services that power the B2B sales experience.
• Strengthen the system’s reliability and performance, ensuring a seamless experience for users in our stores.
• Evolve our microservice and event-driven architecture, including Kafka-based communication and integrations with core commercial services such as Pricing.
• Safeguard the long-term technical health of the application by championing clean architecture, SOLID principles, and rigorous testing.
• Mentor junior developers, conducting impactful code reviews and raising the overall engineering bar of the team.
• Ensure high data integrity and performance within our PostgreSQL databases.

What We Offer

The Sales app is a cornerstone of STARK Group’s ability to compete and grow in the B2B market. By building a high-performance backend, you are directly impacting the daily work of thousands of employees and the experience of our professional customers.

Your work ensures that the transition from “legacy” to “modern” isn’t just a change in technology, but a leap in how the business can operate – enabling pricing agility, better margin visibility, and a superior sales flow.

Who We Are Looking For

You are an experienced backend engineer who thrives on solving complex problems and turning ambiguous business needs into structured, scalable code. You are a “technical leader by example” who cares as much about the maintainability of the code as you do about the feature delivery.

From a technical perspective, we expect that you:

• Have 5–10 years of professional experience in software development, with a strong experience in C# and the .NET ecosystem.
• Have a strong track record of building microservices and distributed systems in cloud environments (preferably Azure).
• Are experienced with event-driven architectures and have hands on experience with messaging systems (e.g., Kafka).
• Have deep knowledge of relational databases, specifically PostgreSQL.
• Are well-versed in engineering best practices, including Clean Architecture, DDD, SOLID, and automated testing.
• Have experience deploying and monitoring applications using Kubernetes, Argo, and Grafana.

In addition, it is an advantage if you:

• Have experience with B2B sales processes or large-scale e-commerce logic.
• Have a general understanding of AI integration within software development to improve productivity or feature sets.
• Have worked in a matrix organization within a large-scale digital transformation programme.

Overall, you bring a pragmatic approach to engineering. You care about building solutions the right way, while recognising that strong engineering is also about balancing technical quality with the need to deliver business value.

Welcome to Group IT

Group IT is at the heart of STARK Group’s digital transformation. We are replacing legacy systems and building a modular, scalable, cloud-native IT landscape that supports our international business.

You’ll be part of a modern engineering environment where platform capabilities, developer experience, and operational excellence are central to how we deliver value—and where your contribution will have a direct impact on business outcomes.

STARK Group

STARK Group is a growing private equity-owned company with a strong legacy. STARK Group was first established in Denmark in 1896 and has today evolved into a leading European retailer and distributor of heavy building materials with net sales of approx. EUR 9 billion. With a dedicated team of more than 20,000 employees and +1,150 branches and distribution centres across the Nordics, Greenland, Germany, Austria and the UK, we live and breathe to serve professional craftsmen with heavy building materials all the way from the Austrian Alps to Tromsø, close to the Arctic circle and everywhere in between. STARK Group is committed to reach net zero emissions by 2050 across the entire business, is a signatory to the UN Global Compact, and works within fully 2030 validated science-based targets to keep global warming below 1.5 °C At STARK Group IT, we believe in the richness diversity brings. We invite individual of all backgrounds to join us in creating and inclusive and welcoming environment. We believe in a workplace where everyone can bring their authentic selves to work.

Agency Policy

STARK Group IT appreciates the interest of all candidates. However, we prefer to directly engage with individuals seeking employment opportunities. Therefore, we kindly request recruitment agencies, head-hunters, and third-party staffing services to refrain from contacting us regarding this job posting. All applications should be submitted directly by the candidates through our official application process. We value direct communication and look forward to reviewing your application.