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Senior Software Developer at Valsoft Corporation. We are seeking a highly skilled and experienced Senior Software Developer to join our team. This role requires deep expertise in .NET Core, C#, SQL, AWS, TypeScript, React, and GitLab, along with a strong understanding of software architecture, agile methodologies, and team leadership. As a senior member of the team, you will play a key role in shaping technical solutions, mentoring peers, and driving best practices across the development lifecycle.. Responsibilities. . Lead the design, development, and maintenance of scalable web applications using . C#, .NET Core, MVC. , and . React. .. . Collaborate with cross-functional teams to define technical requirements and deliver high-impact solutions.. . Participate in architectural decisions and contribute to long-term technical strategy.. . Ensure code quality through reviews, testing, and adherence to development standards.. . Mentor junior developers and promote knowledge sharing within the team.. . Manage CI/CD pipelines and version control using . GitLab. .. . Work in an agile environment, contributing to sprint planning, estimations, and retrospectives.. . . Minimum . 5 years of professional experience. in backend development with . C# and .NET Core. .. . Strong proficiency in . SQL Server. and relational database design.. . Hands-on experience with . AWS. services (e.g., Lambda, S3, RDS).. . Solid frontend development skills using . TypeScript. and . React. .. . Familiarity with . MVC architecture. , . SOLID principles. , and design patterns.. . Experience with . GitLab. for source control and CI/CD workflows.. . Proven ability to work in . agile teams. and deliver in fast-paced environments.. . Excellent problem-solving, communication, and collaboration skills.. . . Bachelor’s degree in Computer Science, Telecommunications Engineering, or a related field. .. . Preferred Qualifications. . Experience with automated testing frameworks (unit, integration).. . Exposure to microservices or event-driven architectures.. . Knowledge of DevOps practices and infrastructure as code.. . Previous experience in mentoring or leading small development teams.. . Company Location: Spain.