Senior Full-Stack .NET Developer

About The Company Avanti Recruitment is a leading staffing and recruitment agency specializing in placing talented professionals within the technology sector. Known for its commitment to excellence, Avanti works closely with a diverse range of established and innovative companies to connect them with top-tier talent. The company prides itself on its deep industry knowledge, personalized service, and a strong network that spans various technology disciplines. With a focus on fostering long-term relationships and understanding client and candidate needs, Avanti Recruitment has built a reputation as a trusted partner in the tech recruitment landscape. About The Role Avanti Recruitment is currently seeking a highly skilled Senior Fullstack .NET Developer with substantial experience in React to join a well-established software business. This is a hands-on engineering position focused on modernizing a critical business platform. The successful candidate will play a key role in transforming an existing legacy application into a scalable, maintainable, and modern architecture. The role involves developing new features, improving existing systems, and contributing to the design and architecture of the platform. You will work closely with cross-functional teams to enhance the overall quality, performance, and scalability of the application, ensuring it meets the evolving needs of the business. This opportunity offers a chance to be at the forefront of technological innovation within a dynamic environment, contributing to both frontend and backend development initiatives. Qualifications The ideal candidate will possess a strong background in software development with expertise in C# and .NET technologies. Proven experience with React for frontend development is essential, along with a solid understanding of REST API design and development. Candidates should have practical knowledge of automated testing and test-driven development (TDD), demonstrating a commitment to high-quality, maintainable code. Familiarity with CI/CD pipelines, cloud platforms, and modern software architecture principles is highly desirable. Previous exposure to legacy system modernization, cloud-based solutions, or AI-assisted development would be advantageous. The candidate must demonstrate strong problem-solving skills, the ability to work independently, and a proactive approach to technical challenges. Responsibilities As a Senior Fullstack .NET Developer, your core responsibilities will include building and maintaining robust applications and services using C# and the latest .NET frameworks. You will design and develop RESTful APIs to facilitate seamless integration across systems and contribute to the modernization of an established application architecture. Developing frontend functionalities using React will be a key aspect of your role, enabling a modern web-based user experience. You will actively participate in improving automated test coverage, ensuring high code quality and reliability through TDD practices. Collaborating with the team on software design and architecture decisions, you will help shape the technical direction of the platform. Your work will focus on enhancing platform maintainability, scalability, and long-term technical sustainability. Additionally, you will support existing systems while contributing to future replacement projects, ensuring a smooth transition towards modern solutions. Benefits Joining this organization offers a competitive salary package of up to £70,000, complemented by a pension scheme, holiday allowance, and additional employee benefits. The company promotes a flexible, remote-first working environment, with initial onboarding and occasional in-person collaboration at West London or along the M4 corridor, with costs covered by the employer. Employees benefit from a supportive and innovative work culture that encourages continuous learning and professional development. Opportunities for career growth, exposure to cutting-edge technologies, and involvement in impactful projects are integral parts of this role. The organization also values work-life balance and offers a range of benefits designed to support employee well-being and job satisfaction. Equal Opportunity Avanti Recruitment is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, age, disability, or any other protected status. We believe that diverse teams foster innovation and drive success, and we are dedicated to ensuring a fair and equitable recruitment process for everyone.