Description We are excited to offer an opportunity for a Senior .Net Software Developer at our location in Reston, Virginia. This role is integral to our team, and involves developing user interface software, working with .NET, CSS - Cascade Styling Sheets, React.js, and more. Responsibilities: • Develop robust and user-friendly software applications using .NET • Create dynamic web interfaces with CSS - Cascade Styling Sheets • Enhance user experience through the creation and maintenance of React.js components • Implement, test, and debug user interface software • Collaborate cross-functionally to determine system requirements and functionalities • Ensure the performance, quality, and responsiveness of applications • Maintain code quality, organization, and automatization • Support the entire application lifecycle (concept, design, test, release and support) • Continuously discover, evaluate, and implement new technologies to maximize development efficiency. Requirements • Proficiency in .NET framework and associated coding languages. • Extensive experience with CSS - Cascade Styling Sheets is required. • Demonstrable knowledge of user interface software. • Proficiency in React.js is a must. • A minimum of five years’ experience in a similar role as a .Net Software Developer. • Bachelor’s degree in Computer Science or related field is required. • Strong understanding of software development principles and methodologies. • Experience with database design and data modeling. • Excellent problem-solving skills and ability to think logically. • Ability to work collaboratively in a team environment. • Strong written and verbal communication skills. • Ability to manage multiple tasks and priorities effectively. • Detail-oriented with a strong focus on the quality of work. • Experience in full project life cycle including design, coding, testing, and implementation. • Ability to learn and adapt to new technologies quickly. Technology Doesn't Change the World, People Do.® Robert Half is the world’s first and largest specialized talent solutions firm that connects highly qualified job seekers to opportunities at great companies. We offer contract, temporary and permanent placement solutions for finance and accounting, technology, marketing and creative, legal, and administrative and customer support roles. Robert Half works to put you in the best position to succeed. We provide access to top jobs, competitive compensation and benefits, and free online training. Stay on top of every opportunity - whenever you choose - even on the go. Download the Robert Half app (https://www.roberthalf.com/us/en/mobile-app) and get 1-tap apply, notifications of AI-matched jobs, and much more. All applicants applying for U.S. job openings must be legally authorized to work in the United States. Benefits are available to contract/temporary professionals, including medical, vision, dental, and life and disability insurance. Hired contract/temporary professionals are also eligible to enroll in our company 401(k) plan. Visit roberthalf.gobenefits.net for more information. © 2025 Robert Half. An Equal Opportunity Employer. M/F/Disability/Veterans. By clicking “Apply Now,” you’re agreeing to Robert Half’s Terms of Use (https://www.roberthalf.com/us/en/terms) .