Publication date : Dec 17, 2025, 11:30AMPurpose of the jobdesign, develop, and maintain complex software solutions across multiple platforms. This role requires expertise in .NET technologies, JavaScript frameworks, and other programming languages, ensuring scalable, secure, and high-performing applications. The Senior Developer will also mentor junior team members, contribute to architectural decisions and lead projects with vendors.Duties and responsibilitiesLead the design and implementation of enterprise-level software solutions.Develop and maintain applications using ASP.NET Core, C#, and JavaScript frameworks (React, Angular).Integrate systems with third-party APIs and services.Optimize application performance and ensure security best practices.Collaborate with cross-functional teams to define technical requirements and solutions.Conduct code reviews and enforce coding standards.Mentor junior developers and provide technical guidance.Troubleshoot and resolve complex technical issues.Lead projects with external vendors and manage deliverables.Job specificationEducation and ExperienceBachelors degree in computer science, Information Technology, or a related field.Experience and Skills:2-4 years of experience in software development, with strong .NET and JavaScript expertise.Proficiency in .NET Framework (ASP.NET MVC, Web API).JavaScript and frameworks (React, Angular, Node.js).Additional languages such as TypeScript, Python, or Java.Strong understanding of OOP, design patterns, and software architecture.Experience with relational and NoSQL databases (SQL Server, Oracle, MongoDB).Excellent problem-solving and communication skills. At Orange, only your skills matter. Regardless of your age, gender, background, origin, religion, sexual orientation, disability, neurodiversity, or appearance, we actively encourage diversity within our teams, as it is a collective strength and a driver of innovation.Orange is a disability-inclusive employer: please feel free to let us know about any specific needs you may have.