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Description Weu2019re seeking a .NET Developer to help modernize legacy applications and build new SharePoint-based web applications. This role is 100% onsite near Portsmouth, NH and will play a key part in improving and evolving internal business systems. Key Responsibilities: + Modernize legacy applications + Migrate legacy applications to SharePoint + Design, develop, and enhance SharePoint web applications + Collaborate with business and IT teams to gather requirements and deliver solutions + Troubleshoot, optimize, and support production systems Required Skills: + Strong experience with .NET / C# + Experience working with legacy application modernization + Hands-on development with SharePoint (Online or On-Prem) + SQL Server and web technologies (HTML, CSS, JavaScript) Nice to Have: + Experience with APIs, ColdFusion, or modern front-end frameworks + Exposure to cloud platforms (Azure preferred) Requirements u2022 At least four years of experience in web application development, including C# .NET and database-driven web parts. u2022 Strong knowledge of JavaScript, jQuery, and database management with Microsoft SQL Server and Oracle. u2022 Familiarity with Fortify vulnerability scanning and security remediation processes. u2022 Must hold one of the following certifications prior to onboarding: CompTIA Security+ CE, CISSP, CASP, or EC-Council Network Security Administrator. u2022 Ability to comply with Department of Defense cybersecurity standards and privileged access agreements. u2022 Excellent problem-solving, communication, and collaboration skills. Technology Doesn't Change the World, People Do.u00ae Robert Half is the worldu2019s 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 ( 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. u00a9 2025 Robert Half. An Equal Opportunity Employer. M/F/Disability/Veterans. By clicking u201cApply Now,u201d youu2019re agreeing to Robert Halfu2019s Terms of Use ( and Privacy Notice (.