Senior Software Engineer

Stark Sourcing and IT; Viby; On-site; DKK 900,000 - 1,300,000; Full time

Job summary

STARK Group is seeking a Senior Backend Engineer to drive the Sales application's evolution, building scalable, cloud-native services powering B2B sales across thousands of professional customers.

You will design robust backend systems, strengthen reliability and performance, and advance a microservice/event-driven stack with Kafka, PostgreSQL, Kubernetes, Argo and Grafana. You will mentor juniors and uphold Clean Architecture and DDD practices.

Qualifications

• 5–10 years of professional software development experience.
• Strong experience in C# and the .NET ecosystem.
• Proven track record in building microservices and distributed systems in cloud environments (Azure preferred).
• Hands-on with event-driven architectures and messaging systems (Kafka).
• Deep knowledge of relational databases, esp. PostgreSQL.

Responsibilities

• Lead the design and implementation of robust backend services powering the B2B sales experience.
• Strengthen system reliability and performance for stores’ users.
• Evolve microservice and event-driven architecture with Kafka integrations to core services like Pricing.
• Champion Clean Architecture, DDD, SOLID, and automated testing to safeguard long-term health.
• Mentor junior developers through code reviews and engineering excellence.

Skills

C# / .NET

Backend engineering

Cloud-native

Microservices

Event-driven

PostgreSQL

SOLID / Clean Architecture

DDD

Automated testing

Mentoring

Kubernetes

Kafka

Grafana

Argo

Tools

Kubernetes

Argo

Grafana

Kafka

Job description

What you’ll be doing

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.

• 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.

Additional advantages

• 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.

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.

The value of equal opportunity is embedded in the way we do business and retain talent groupwide. We believe in the positive influence of diversity, equity, and inclusion on our work environment, performance, and relationships with customers and suppliers. We encourage applications from individuals of all backgrounds and perspectives, as we strongly believe that a diverse workforce strengthens our team.