Project Overview
Client: SLOWFASHION
Country: Sweden
Year: 2024
Project Scope: API integration with a digital authentication tool (LegitGrails) and development of the full backend infrastructure for real-time product verification.
Technologies Used: NET 8, Entity Framework Core 8, Swashbuckle, PostgreSQL, DBeaver, Auto mapper, MediatR.
Client Background
SLOWFASHION is a Stockholm-based startup reshaping how luxury second-hand fashion is bought and sold. With a focus on convenience, trust, and elevated user experience, the company has launched Premium Selling Service – a zero-effort resale solution where SLOWFASHION handles everything from pickup and pricing to styling and now, advanced authentication.
The Needs and Challenges
As part of launching their Premium Selling Service, SLOWFASHION needed to ensure that all items sold through the platform could be authenticated using modern, trusted technology.
The challenge was to seamlessly integrate LegitGrails’ product authentication API into SLOWFASHION’s app and database, while maintaining a smooth and secure user experience – both for sellers and buyers.
Solution implemented
Xessable provided expert engineering support to: Establish a robust backend-to-backend connection between SLOWFASHION and LegitGrails’ system. Implement secure endpoints and communication protocols to facilitate product verification. Build out the internal logic for handling authentication status, triggers, and user-side visibility.
Ensure the system was scalable for future use beyond Premium Selling Service.
Talent Integration
Two senior developers from Xessable worked closely with SLOWFASHION’s CTO and product team. Despite the tight scope and timeline, Xessable’s engineers embedded efficiently, understood the brand and user journey, and delivered on time production-ready solutions with minimal iteration required.
Project Impact
Thanks to Xessable’s backend development and integration expertise, SLOWFASHION now offers automated authentication as a core part of their premium offering — building trust with users and standing out in a competitive resale market.
The integration positions SLOWFASHION as a forward-thinking platform prioritizing both sustainability and security in fashion resale.
Conclusion
This collaboration laid the technical foundation for SLOWFASHION to scale trust in second-hand fashion. With authentication now embedded as a seamless part of the user experience, the brand can confidently grow its offering — and do so backed by a reliable and scalable tech partner.
