We make it possible for businesses to meet the ever-changing requirements of their industry and customer expectations. The Auctane family of mailing and shipping software products includes ShipStation, Stamps.Our partners include Amazon, UPS, USPS, eBay, BigCommerce, Shopify, WooCommerce, and Walmart.
About the role As a Senior Software Engineer, you will design, develop, and maintain complex user-facing applications and supporting backend services that align with business and technical requirements. You will take ownership of end-to-end feature implementation, optimizing client-side performance, accessibility, and user experience while ensuring robust API integration and data flow. You will troubleshoot technical challenges across the full application stack and collaborate with cross-functional teams (including UI/UX designers, product managers, and backend engineers) to deliver scalable, responsive solutions. Your role will involve contributing to technical discussions, refining best practices for modern frontend architecture and service integration,



and supporting junior engineers through code reviews and knowledge sharing.
Contribute to end-to-end architecture discussions and develop software components aligned with functional and non-functional requirements.
Creating high-quality, maintainable code in accordance with company best practices and standards.
Participate in software testing, debugging, and optimization to ensure performance, scalability, and reliability.
Develop and maintain cloud-based APIs, microservices, and intuitive user interfaces to deliver complete end-to-end features, as part of a collaborative engineering team.
Support junior engineers through code reviews, pair programming, and sharing technical insights.
Collaborate with the team to refine task prioritization and align work with project goals.
Tackling complex problems requiring deep analysis and evaluation of diverse factors.
Collaborating closely with product, UX, and infrastructure te

📌 (Senior) IT Software Engineer H/F (Madrid)
🏢 Auctane
📍 Madrid