Handle are currently working with a global entertainment brand who are looking for an Interim Senior Web App Developer to join their busy team! The role focuses on designing, building, and maintaining scalable, secure web applications while collaborating with stakeholders to deliver seamless cross-platform solutions and drive continuous improvement.Key responsibilities include -Build and maintain complex web applications using ASP.NET MVC 5, C#, and React, applying strong problem-solving skills to improve performance and qualityContribute to front-end development with HTML5, CSS3, JavaScript, and ReactManage source control, branching, and deployments using GitLab or Azure PipelinesMentor and guide junior and mid-level developers on technical best practicesSupport technology migrations with clean architecture, scalable design, and smooth implementationDeliver secure, scalable, high-quality code aligned with architecture and sprint goalsContinuously explore new technologies to improve platform and team capabilityParticipate in architectural decisions to enhance performance, scalability, and maintainabilityCandidate requirements -8+ years'' experience in digital development, with a strong portfolio in bespoke eCommerce and enterprise web applicationsExperienced in RESTful APIs, with knowledge of SOAP, XML, and XPathExpertise in C#, ASP.NET MVC 5, SQL Server, and Entity Framework; experience with HTML5, CSS3, JavaScript, and ReactStrong grounding in OOP, SOLID principles, and des