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# Net Developer

- **Company:** SGS
- **Location:** Madrid, Spain
- **Contract:** Permanent contract
- **Skills:** HTML, JavaScript (Programming Language), .NET Framework, Data Analysis, Application Performance Management, Microsoft Azure, Software Bug Management, C Sharp (Programming Language), Cascading Style Sheets (CSS), DevOps, JQuery, Microsoft SQL Server, SQL Stored Procedures, SQL Databases, Systems Integration, Web Applications, Webforms, Codebase, Front End Software Development, Code Restructuring, Legacy Systems, Web Api
- **Published:** September 29, 2026
- **Apply:** https://www.buscojobs.com.es/net-developer-en-madrid-ID-373372448

## About the Role

NET technologies , particularly / WebForms Solid experience with SQL Server (queries, views, stored procedures, data analysis) Frontend basics: JavaScript, HTML, CSS (jQuery is a plus) Experience working on legacy systems and existing codebases Comfortable supporting live, customer-facing applications Nice to Have C# / modern .
NET Azure (App Services, SQL, DevOps) Web APIs Experience with system modernization or refactoring Exposure to integrations, data imports/exports, or background jobs Skills Strong problem-solving skills and attention to detail Ability to troubleshoot across code, data, and integrations Comfortable working in a hands-on, support-focused environment Able to deliver safe changes to live systems Collaborative team player with clear communication

## Description

Job Description You will work on the development, maintenance , support and incremental modernisation of the UK Interactive systems (known as UKI).The role is hands-on and delivery-focused , supporting agreed enhancements, defect fixes, production support, security remediation, performance improvements and ongoing de-risking activity across existing UKI web-based applications.The UKI systems are live, customer-facing platforms used by business users, suppliers and external customers.The role therefore requires a developer who is comfortable working with existing legacy applications, particularly WebForms and SQL Server-based systems , while also supporting gradual modernisation using newer, supported technologies where appropriate.The role will work closely with technical leads, existing developers, support team and business stakeholders to ensure the systems remain stable, secure, maintainable and fit for purpose for current customers.Responsibilities Develop and maintain UKI web applications ( / WebForms) Deliver enhancements, bug fixes, and performance improvements Support live production systems and troubleshoot issues end-to-end Work with SQL Server (queries, views, stored procedures, data analysis) Contribute to modernization of legacy components (.NET / Azure) Improve application performance, security, and reliability Support integrations, background jobs, and data processes (imports/exports) Assist with security fixes and remediation on existing systems Collaborate with developers, tech leads, and support teams Qualifications Strong experience with .NET technologies , particularly / WebForms Solid experience with SQL Server (queries, views, stored procedures, data analysis) Frontend basics: JavaScript, HTML, CSS (jQuery is a plus) Experience working on legacy systems and existing codebases Comfortable supporting live, customer-facing applications Nice to Have C# / modern .NET Azure (App Services, SQL, DevOps) Web APIs Experience with system modernization or refactoring Exposure to integrations, data imports/exports, or background jobs Skills Strong problem-solving skills and attention to detail Ability to troubleshoot across code, data, and integrations Comfortable working in a hands-on, support-focused environment Able to deliver safe changes to live systems Collaborative team player with clear communication


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