Backend Developer, Partner Integrations

Jack & Jones; Brande; On-site; DKK 540,000 - 780,000; Full time

Job summary

JACK & JONES in Brande, Denmark, is seeking a backend developer to build and maintain reliable marketplace integrations (Amazon, Zalando, etc.). You will own projects from development to deployment, focusing on scalable data exchange for product data, stock, and pricing across internal systems and external platforms.

The role emphasizes building APIs and connectors, onboarding partners, and improving data flows. Relevant experience with .NET/C#, XML/JSON, and collaboration is valued.

Qualifications

• Experience with .NET / C# in backend development.
• Experience working with XML and JSON data formats.
• Strong communication and cross-team collaboration skills.
• Fluent in English, both written and spoken.
• Familiarity with CI/CD and cloud/DevOps concepts is a plus.

Responsibilities

• Developing and maintaining backend connectors and APIs.
• Ensuring stable synchronization of product data, stock and pricing with marketplaces.
• Onboarding new marketplace partners.
• Optimizing integrations and data flows across systems.
• Issue ownership from implementation to deployment.

Skills

.NET / C#

XML/JSON

Communication

Collaboration

Kubernetes

Jira

GitHub

GitHub Actions

Unit testing

Integration testing

Tools

Kubernetes

Jira

GitHub

GitHub Actions

Job description

Are you a backend developer who enjoys building reliable integrations and delivering scalable solutions? Are you motivated by taking ownership of your projects from development to deployment?

Then you could be the one we are looking for to help build the integrations that connect JACK & JONES, VERO MODA and ONLY with leading marketplaces such as Amazon and Zalando! We offer the opportunity to work in a quality-driven environment with plenty of opportunities for professional development and technical challenges.

THE DEPARTMENT

Brand Tech is a dynamic e-commerce department with the ambition of making our brands the preferred fashion choice across both our own webshops and external marketplaces. You will join an in-house team of experienced frontend and backend developers working closely together to deliver robust digital solutions across brands. You will become part of an international environment where collaboration, knowledge sharing and continuous improvement are central to the way we work.

THE JOB

As part of the Partner Team, you will develop and maintain the backend connectors that integrate our brands with marketplaces such as Amazon, Zalando and other partners. Your focus will be on building reliable, scalable integrations that ensure accurate and efficient data exchange. Working in a data-driven environment, you will help ensure that product information, stock levels and pricing flow seamlessly between our internal systems and external marketplace platforms.

Your responsibilities will include:

• Developing and maintaining APIs and marketplace connectors
• Ensuring stable synchronisation of product data, stock and pricing
• Onboarding new marketplace partners
• Optimising integrations and data flows across systems
• Taking ownership of projects from implementation to deployment.

YOUR PROFILE

You're motivated by solving technical challenges and enjoy building reliable, scalable solutions. You're curious by nature, enjoy learning new technologies and value collaboration and knowledge sharing. You like working closely with your teammates and seeing your work through from development to deployment.

We care more about your curiosity, technical skills and genuine interest in software development than ticking every box. What matters most is that you:

• Have experience with .NET / C#
• Have experience working with XML and JSON
• Communicate well and enjoy collaborating across teams
• Speak and write English fluently

Experience with one or more of the following is an advantage

• Marketplace or e-commerce APIs (e.g. Amazon SP-API, Zalando Partner Program (zDirect), Tradebyte or Channable)
• Kubernetes
• Jira, GitHub and GitHub Actions
• Unit and integration testing
• Google Cloud Platform or other cloud providers
• Datadog
• Microservice architecture
• Event-driven integrations and message queues (e.g. Google Pub/Sub or Amazon SQS).

WE LOOK FORWARD TO HEARING FROM YOU

If you have any questions regarding the position, feel free to contact Rasmus Skjoldborg Jørgensen [phone]. Otherwise, please send your application and CV along with relevant examples of your skills and previous projects no later than 4 August 2026.

WORKPLACE

Brande Denmark.

ABOUT JACK & JONES

JACK & JONES is high-quality fashion for young men. Founded in 1990, JACK & JONES is now the largest business unit within BESTSELLER and is, with its 1000+ stores, the biggest menswear retailer in Europe. With jeans as the core business, JACK & JONES enriches the heritage of authentic jeanswear by respecting history and focusing on innovative treatments and designs.

JACK & JONES covers the many facets of a young man’s wardrobe. From his playful youth to his need for timeless classics, the brand brings in a world of brotherhood, fun, and good vibes in all its designs. And since 2017, JACK & JONES has expanded its brand portfolio with JACK & JONES PLUS, JACK & JONES JUNIOR, and JJXX.

JACK & JONES is part of the worldwide fashion company BESTSELLER. For more information, please go to www.jackjones.com or www.bestseller.com.