Top .NET Developer Jobs in Philadelphia, PA

Develop, test, debug, integrate, and maintain secure Navy logistics and supply chain applications. Design databases, APIs, system interfaces, and scalable web solutions using C#, ASP.NET, MVC, SQL Server, JavaScript, and REST services. Perform testing, defect resolution, code reviews, configuration management, deployments, troubleshooting, documentation, and customer support within an Agile environment.

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.

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.

Design, build, and maintain production-grade .NET web applications and APIs on Azure. Own full-stack delivery from data models and SQL to front-end components, CI/CD, testing, and architecture. Collaborate with product and delivery teams, participate in code reviews, and ensure secure, observable, well-tested services.

Develop and modernize enterprise applications using C#/.NET and PostgreSQL, including refactoring a Microsoft Access/VBA application. Responsibilities include writing maintainable code, participating in code reviews, testing, documentation, deployment, and collaborating with the software development team in a fully remote environment.

Owns the design, development, testing, deployment, and maintenance of production software. Builds C#/.NET backend services, Angular web applications, and .NET MAUI mobile apps; optimizes SQL Server databases; resolves production issues; improves reliability, security, performance, and observability; writes tests and documentation; participates in code reviews; and translates ambiguous business needs into maintainable technical solutions.

Leads hands-on full-stack development across architecture, implementation, testing, deployment, and support. Designs secure, scalable C#/.NET and Angular applications, cloud integrations, APIs, and data solutions on AWS. Guides developers, establishes engineering standards, manages CI/CD and automated testing, troubleshoots complex issues, and drives cloud optimization, security, and technical debt reduction. Collaborates with product, architecture, DevOps, analytics, and project teams while supporting migration of on-premises applications to AWS.

Lead a development team while remaining hands-on in full-stack engineering. Design, build, test, deploy, and support secure web applications using C#/.NET, Angular, databases, and AWS. Drive cloud migrations, architecture, CI/CD automation, application security, troubleshooting, performance and cost optimization. Mentor developers, establish engineering standards, lead technical delivery, and collaborate with product, data, DevOps, and architecture teams.

Develop high-quality, scalable, and maintainable software solutions as part of a small engineering team. Coach client teams on modern software development practices, apply test-driven development, and participate in ongoing training and professional development. The role is hybrid, requiring onsite work two to three days per week.

Build scalable backend-heavy services and applications using C# and .NET, while contributing to Angular and TypeScript UI development. Design and develop REST APIs and microservices, work with relational databases, implement automated testing and CI/CD, and ensure system security, scalability, and performance. Preferred work includes event-driven architectures, messaging systems, NoSQL databases, caching, search technologies, and mentoring engineers or leading technical initiatives.

Develop and maintain scalable, secure .NET and Angular web applications for a career and college planning SaaS platform. Collaborate with product managers, QA, and stakeholders to translate requirements into technical solutions, troubleshoot complex issues, optimize performance, and adopt relevant technologies. The role requires full-stack expertise across Angular, C#, ASP.NET, MVC, REST APIs, .NET Core, and SQL, along with strong communication and ownership in a remote environment.

Leads end-to-end modernization from a monolith to microservices, including legacy analysis, architecture, estimation, data migration, deployment, and production support. Guides .NET services, databases, messaging, containerization, and frontend integrations. Acts as the technical escalation point for complex issues while improving Jira tracking, estimation accuracy, QA collaboration, release predictability, and engineering processes. Manages and develops the team through one-on-ones, performance reviews, feedback, and career-focused objectives.

Develop and maintain a distributed CAD-to-CAD software solution using .NET and C#. Responsibilities include designing, coding, documenting, testing, debugging, and optimizing multithreaded server applications; managing web services, databases, installations, monitoring, and upgrades; and performing unit, load, fault, and automated functional testing. The role also involves client communication, technical documentation, proposal support, training assistance, and occasional onsite travel.

Lead the design, architecture, development, deployment, and optimization of scalable .NET backend systems processing millions of daily healthcare transactions. Mentor developers, guide technical decisions, improve CI/CD pipelines, implement secure APIs, and collaborate with product stakeholders. The role requires expertise in .NET, C#, ASP.NET Core, cloud-native AWS services, Kubernetes, microservices, distributed systems, testing, observability, and secure software development.

Lead end-to-end development of secure, scalable web applications and data solutions supporting clinical trial operations. Design frontend and backend components using C#/.NET, Angular, AWS, and relational or non-relational databases. Guide architecture, testing, deployment, CI/CD, security, cloud optimization, and regulatory compliance. Mentor developers, oversee technical delivery, troubleshoot complex issues, and lead migration and modernization of on-premises applications to AWS.

Develop and maintain backend services and RESTful APIs using C# and .NET. Design and optimize MySQL schemas and queries, troubleshoot production and staging issues, improve performance and scalability, document architecture, and uphold code quality and security. Collaborate with cross-functional teams in a fully remote environment while contributing to development best practices and continuous improvement.

Seeking a Senior .NET Developer with experience in Sitecore CMS and financial systems integration. Must have strong software development skills and experience with Agile methodologies.

The .Net Developer will work in agile teams, handling software development tasks including design, testing, and deployment while supporting existing applications.

The .NET FullStack Developer will design, code, test, and debug software product enhancements while ensuring high performance and maintainability, working closely with various teams.

Lead design, implementation, and maintenance of the CoverGo SaaS platform across front-end and back-end. Provide technical direction, optimize performance and security, enforce coding standards, conduct code reviews, mentor junior developers, and collaborate with product and design teams to build scalable, high-traffic insurance enterprise solutions.

The role involves converting visual designs into web pages, collaborating with teams, and ensuring compliance with best practices for front-end development.

Lead analysis, design, development, testing, implementation and support of global financial .NET applications. Translate user requirements into technical specs, oversee onshore/offshore teams, participate in code reviews, maintain documentation, estimate work, follow SDLC, and support code promotion (TFS).

Develop and maintain .NET applications using C# and ASP.NET. Support legacy VB Classic code. Work with SSIS and SQL Server for data integration. Maintain Windows Server environments, have basic Unix familiarity, and communicate with business users to gather requirements.

Develop and maintain .NET applications using C# and ASP.NET. Work with SQL Server and SSIS for data integration. Support legacy VB (Classic) code, manage Windows Server environments, and liaise with business users. Basic Unix familiarity required.