Top Senior .NET Developer Jobs

Develop and maintain full-stack web applications using .NET, ASP.NET, React, and related technologies. Design front-end and back-end components, write and test scalable code, troubleshoot issues, participate in code reviews, and collaborate with cross-functional teams throughout the software development lifecycle. The role is onsite at a government facility in Washington, D.C., and requires an active Top Secret clearance with SCI and CI Poly eligibility.

Develop and maintain full-stack web applications using .NET and React. Design front-end and back-end components, write scalable code, conduct testing, troubleshoot issues, participate in code reviews, and collaborate with cross-functional teams throughout the software development lifecycle. The role requires active TS/SCI clearance, U.S. citizenship, a bachelor’s degree, and at least eight years of experience.

Design, develop, and maintain scalable .NET applications and microservices. Build REST APIs and event-driven solutions with RabbitMQ, manage message reliability, optimize SQL Server data access, implement security, troubleshoot distributed systems, and write automated tests. Collaborate across engineering and business teams, participate in code reviews, support CI/CD and cloud deployments, and improve application performance, scalability, and reliability.

Senior .NET Software Engineer responsible for designing, developing, maintaining, and modernizing secure applications supporting prepaid card manufacturing. Leads architecture discussions, code reviews, DevOps and CI/CD improvements, reliability monitoring, defect resolution, and compliance efforts. Collaborates with stakeholders, manages projects independently, and mentors junior developers while supporting legacy and modern systems.

Design and develop software systems based on business requirements, troubleshoot and resolve reported issues, and conduct peer code reviews. The role requires strong .NET, C#, ASP.NET MVC, Web API, Angular, dependency injection, testing, database, and software design experience. Candidates should understand SOLID principles, design patterns, Entity Framework, SQL Server, source control, and continuous integration. WCF, SOA, SSRS, and Kendo UI experience are advantageous. The position requires six or more years of .NET development experience and local, face-to-face availability in KOP, Pennsylvania.

Develop web applications and backend services using Microsoft technologies, Angular, C#, .NET, REST APIs, and SQL Server. Design maintainable architectures, write automated tests, participate in code reviews and Agile delivery, resolve production issues, document systems, clarify requirements, and mentor junior developers. The role also involves enforcing development standards, managing project work, and supporting Azure and DevOps-based solutions.

Maintains, troubleshoots, and enhances .NET applications using C#, WCF, MVC, SQL Server, and related technologies. Responsibilities include system analysis, application development, production and on-call support, testing, documentation, SDLC compliance, issue resolution, and communication with technical and business stakeholders across multiple projects.

Develop and maintain scalable Microsoft technology solutions using C#, .NET, ASP.NET, MVC, Web API, SQL Server, and front-end technologies. The role requires expertise in multi-threaded programming, design patterns, MVVM, Knockout JS, BizTalk configuration, EDI transactions, Agile development, and production support. The developer will collaborate with development teams and architects while ensuring system performance, availability, and timely issue resolution.

Develop and maintain full-stack web applications using React, .NET, and related technologies. Design front-end and back-end components, write scalable code, conduct testing, troubleshoot issues, participate in code reviews, and support the full software development lifecycle. Collaborate with cross-functional teams and clients while applying secure coding, architectural patterns, cloud services, and DevOps practices. The role also includes mentoring, technical communication, and contributing to continuous process improvement.

Develop and improve C# and ASP.NET systems, including a high-volume trading engine. Design scalable distributed architectures, conduct technical reviews, optimize system performance, resolve complex technical issues, and collaborate with project teams and business owners. Work across backend, web, and mobile development using modern programming practices, databases, cloud infrastructure, and messaging technologies.

Develop and maintain PLM and digital engineering applications using C# and .NET. Lead software design, requirements gathering, SDLC planning, coding, testing, code reviews, and technical problem-solving. Collaborate with engineers, business analysts, architects, administrators, and business representatives to deliver application solutions. Improve development quality through automated testing, peer reviews, and development standards while mentoring and guiding team members.

Develop and modify .NET applications, optimize SQL databases with DBAs, translate business requirements into technical solutions, estimate project effort, collaborate with technical teams, and incorporate security, scalability, and quality throughout software development.

Senior .NET Software Engineer responsible for end-to-end software development using Microsoft technologies. Requires extensive experience in SDLC, design principles, technical documentation, web application development with .NET, Agile/SCRUM, Entity Framework, database design, and version control. Familiarity with project tools JIRA, TEMPO, Bitbucket, and Confluence preferred.

Senior .NET Web App Developer responsible for designing and building .NET web applications, implementing Oracle PL/SQL solutions, using Entity Framework and Blazor, applying design principles, producing technical documentation, performing performance tuning, and collaborating in Scrum/Agile teams with Bitbucket, JIRA, Tempo, and Confluence.

Develop and maintain web-based applications using .NET/C#, JavaScript, HTML/CSS, SQL and Oracle/SQL Server. Perform root cause analysis, collaborate with teams for requirements, follow Agile SDLC, present change demonstrations, and use Azure DevOps/Jira for lifecycle management. Implement and maintain Blazor components.

Leads full-stack development, maintenance, troubleshooting, and implementation of a federal HR position classification application. Develops .NET APIs, integrates PeopleSoft and Oracle data, maintains authentication services, automated tests, documentation, and Azure DevOps pipelines. Builds AI-assisted applications using LLMs and related technologies while supporting production operations, root-cause analysis, and controlled releases.

Leads a team of up to 12 developers while designing and delivering enterprise full-stack applications using .NET, Angular, microservices, REST APIs, and relational and NoSQL databases. Translates business requirements into technical solutions, manages delivery timelines and compliance artifacts, supports UAT, and promotes CI/CD and DevOps practices. The role also includes stakeholder collaboration, technical estimation, code promotion, repository governance, performance optimization, and mentoring in a regulated financial technology environment.

Develop and maintain .NET/C# applications in a legacy federal environment. Design data integration, movement, modeling, and ETL solutions across databases and platforms; troubleshoot development and production environments; analyze COBOL and mainframe systems; and support architecture, deployment, interoperability, documentation, and continuity efforts. Collaborate with federal staff, vendors, and internal teams while improving system reliability, scalability, and modernization capabilities.

Build and maintain full-stack behavioral health technology features and services. Responsibilities include translating team goals into technical plans, designing APIs and services, evaluating technical tradeoffs, identifying risks, contributing to architecture, collaborating with product and QA, mentoring junior engineers, and improving testing and engineering practices. The role requires C#, TypeScript, .NET, modern frontend frameworks, databases, CI/CD, Docker, Kubernetes, and automated testing experience.

Develop and enhance .NET applications within the Concorde framework for DEA law-enforcement missions. Responsibilities include Agile software development, legacy application support, DevSecOps practices, database-backed web development, application integration, production delivery, and work across classified and unclassified environments. The role requires extensive ASP.NET, C#, MVC, .NET Core, JavaScript, SQL, XML, and relational database experience, along with an active Secret clearance and U.S. citizenship.

Develops and maintains responsive web applications using .NET, ASP.NET, Angular, JavaScript, and related technologies. Designs microservices, APIs, database schemas, and automated workflows; collaborates with business and technology teams to translate requirements into solutions. Manages SDLC artifacts, code repositories, deployments, UAT, defect resolution, security measures, and operational support. Requires independent judgment, strong application development expertise, and familiarity with DevOps, CI/CD, automation, containers, and AI fundamentals.

Leads the design, development, architecture, and implementation of high-throughput enterprise applications using .NET and C#. Responsibilities include resolving complex technical issues, developing event-driven microservices, enforcing architecture and security standards, managing CI/CD and deployments, mentoring engineers, and delivering secure, scalable, highly available systems. The role also requires database engineering, containerization, technical leadership, cross-functional collaboration, and risk governance.

Leads architecture and hands-on development of a next-generation online banking platform using .NET and C#. Responsibilities include system design, production coding, team mentorship, full-stack development, AI/LLM integration, cloud infrastructure, CI/CD, real-time services, security, compliance, and rapid product delivery. The role partners with financial institutions and internal technology groups to build secure, scalable solutions for regulated banking environments.

Develops, tests, debugs, integrates, secures, documents, and deploys software applications and enhancements. Responsibilities include desktop design, security lockdown implementation, automated patching and deployment, integration with standard software packages, user documentation, training, resolving software issues, and addressing customer feedback. The role requires substantial professional experience with AWS, C#, or .NET and an active Top Secret/SCI eligibility clearance.

Develop and modernize county permitting applications by migrating legacy systems to .NET and Oracle platforms. Build C# MVC applications, JavaScript interfaces, Oracle database solutions, SSIS ETL packages, SSRS reports, and secure REST/SOAP integrations. Implement workflow automation, online submissions, invoicing, payments, and ECM integration while maintaining data integrity and regulatory compliance. Collaborate with county analysts, business users, vendors, and cross-functional teams in a hybrid Miami-area environment.