We are a company specialized in developing products based on Microsoft technology. We lead projects involving migration, integration, and process optimization, combining technology with strategic vision. We are looking to hire a **senior back-end profile** who can help us scale our developments and improve user experience on platforms such as nopCommerce, Umbraco, ABP.IO, and other custom solutions. Job characteristics * Full-time position. * Permanent contract. * Salary: €29,000 - €45,000 (depending on experience) Responsibilities * Development and maintenance of web applications, services, and REST APIs using ASP.NET Core * Integration with ERP systems (Business Central, NAV) and e-commerce platforms * Design and optimization of relational databases (SQL Server) * Participation in functional and technical analysis sessions * Implementation of business logic, validations, and automated processes * Application of best practices for security, performance, and scalability Requirements * Solid experience in ASP.NET Core / .NET 6+ development * Knowledge of C#, Entity Framework, LINQ, and design patterns * Proficiency in SQL Server and efficient handling of queries and stored procedures * Familiarity with version control tools (Git) and DevOps * Experience integrating APIs and external services * Valuable experience in cloud environments (Azure, AWS) and containers (Docker) * At least intermediate level of technical English We especially value * Prior experience in e-commerce projects or ERP integration * Functional analysis skills and communication with multidisciplinary teams * Familiarity with agile methodologies (Scrum, Kanban) * Interest or experience in applying artificial intelligence to web development, either to enhance productivity or enrich user experience * Experience working with nopCommerce, Umbraco, and ABP.IO Employment type: Full-time, Permanent contract Salary: €29,000.00 - €45,000.00 per year Benefits: * Christmas gift basket * Company events * Flexible working hours * On-site gym * Summer reduced working hours * Reduced working hours on Fridays * Option for permanent contract * Company-provided computer * Free parking * Training program * Optional remote work Experience: * Back-End Development: 4 years (Required) * ASP.NET Core: 4 years (Required) * Git: 3 years (Required) Work location: Hybrid remote work in 50011 Zaragoza