Top Senior .NET Developer Jobs

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.

Leads the design, development, and implementation of full-stack applications using C#, .NET, Angular, Azure, and SQL Server. Collaborates with cross-functional teams, ensures application security, performance, and scalability, applies Git-based version control practices, mentors developers, and stays current with emerging technologies.

Design, develop, test, and support scalable full-stack applications and cloud-native microservices using .NET, Angular, AWS, SQL, and NoSQL technologies. Build APIs, data integrations, ETL pipelines, and CI/CD solutions while improving system performance, reliability, and scalability. Collaborate with product, architecture, and engineering teams, participate in design and code reviews, troubleshoot applications, document technical solutions, and apply modern DevOps and AI-assisted development practices.

Build, modernize, and maintain cloud-native .NET websites and applications. Design and develop full-stack solutions across application layers, troubleshoot software issues, and ensure compatibility, usability, web standards, and quality delivery. Collaborate with developers, end users, and cross-functional teams to define and implement IT solutions, while contributing to governance, change management, and application modernization.

Design, develop, and modernize scalable enterprise applications using .NET/C# backend services and React/TypeScript frontends. Build secure REST APIs, micro-frontends, and cloud-native solutions; apply clean architecture, testing, CI/CD, and observability practices. Collaborate with architects, product owners, DevOps, QA, and platform teams. Provide technical leadership, mentor engineers, document designs, address scalability and technology risks, and support reliable production deployments in a regulated financial-services environment.

Design, develop, and modernize scalable enterprise applications using .NET, C#, React, and TypeScript. Build secure REST APIs, microservices, and micro-frontends; implement clean architecture, testing, CI/CD, observability, and cloud-native practices. Collaborate with architects, product owners, DevOps, and QA teams, mentor engineers, support production systems, resolve incidents, and address scalability, technology risk, and regulatory requirements.

Designs, develops, tests, deploys, and supports scalable software products and platform capabilities using C# and modern .NET. Builds APIs, backend services, frontend components, integrations, and AI-enabled application features in Azure. Owns capabilities through production support, modernization, monitoring, and continuous improvement. Contributes to architecture, code reviews, CI/CD, security, reliability, and technical planning while collaborating with global Product, Engineering, Architecture, Security, and Platform teams. Mentors engineers and supports maintainable, production-grade applications.

Owns the full lifecycle of critical banking applications and services, including architecture, development, testing, deployment, modernization, production support, and retirement. Designs secure, resilient solutions using C#/.NET, APIs, databases, cloud platforms, containers, and DevOps tooling. Leads technical analysis, code and design reviews, incident response, resiliency improvements, regulatory compliance, and cross-team coordination. Mentors engineers and evaluates AI-assisted development tools while maintaining security, quality, and operational standards.

Lead design and delivery of scalable full‑stack, cloud‑native applications. Drive architecture, AI‑assisted tooling, DevOps and observability practices, implement microservices/APIs, mentor engineers, and publish documentation and runbooks to ensure reliability and operational excellence.

The Senior Full Stack Engineer will modernize legacy systems to microservices, maintain .NET applications, optimize SQL databases, and develop frontend interfaces.

Maintain and modernize a stable .NET/SQL Server platform while leading migration from monoliths to cloud-native microservices. Design APIs and event-driven patterns, containerize deployments, optimize backend .NET apps and SQL performance, and build responsive frontends integrated with microservices. Collaborate across cross-functional teams to ensure scalable, highly available systems.

Designs, develops, and maintains scalable distributed systems and full-stack applications using ReactJS and .NET or Java. Builds RESTful APIs and microservices, manages SQL and NoSQL data, and applies cloud, Docker, Kubernetes, and CI/CD practices. Collaborates with stakeholders and cross-functional teams, leads design reviews and code reviews, mentors junior engineers, documents systems, and supports critical applications through on-call rotations.

Develops end-to-end automation applications, services, user interfaces, databases, and workflows in a complex enterprise environment. Responsibilities include .NET full-stack development, microservices, API integrations, database design, testing, CI/CD, deployment, security compliance, SDLC participation, user support, and defect resolution. The role collaborates with business analysts, architects, and stakeholders to translate requirements into technical solutions and serves as a subject matter expert.

Develop and maintain software applications using .NET, C#, SQL, Azure, Angular, React, and Power Platform. Lead complex development tasks, design systems, write unit tests, troubleshoot applications, participate in Agile ceremonies and code reviews, and collaborate with QA and stakeholders. Mentor junior developers, document technical processes, gather requirements, and ensure secure, maintainable solutions that meet business needs.

Develop and maintain core components of a modern digital auction platform using C# and .NET Core. Responsibilities include designing data models, building RESTful APIs, integrating legacy and third-party systems, developing Azure DevOps CI/CD pipelines, troubleshooting performance issues, conducting code reviews, documenting best practices, and collaborating with product managers and multiple engineering teams.

Develop and maintain internal sales and manufacturing applications using C# and .NET. Implement new features, fix bugs, improve usability, simplify workflows, and ensure solutions meet business requirements. The engineer will work independently on medium to large projects, support existing in-house systems, and use SQL Server, Entity Framework, CI/CD tools, and deployment platforms. This is an on-site role.

Develop and support corporate tax workstation products using .NET, C#, Dynamics 365, Power Automate, ASP.NET, and SQL Server. Responsibilities include technical design, coding, testing, troubleshooting, deployment, performance and security improvements, documentation, code reviews, and mentoring developers. The role collaborates with stakeholders and international teams to deliver reliable solutions on schedule.

Build and maintain scalable, cloud-native APIs and high-value core system components using .NET and related technologies. Lead software architecture and testing discussions, enhance core offerings, collaborate cross-functionally, and ensure quality through code reviews, unit testing, functional testing, telemetry, and performance tuning. Mentor teammates and contribute to continuous technical and process improvement.

Develop and maintain cloud-native applications using .NET, Angular, and Azure. Modernize legacy .NET Framework systems, support migration to .NET Core, build RESTful services, and work with Entity Framework, Docker, and Kubernetes. Collaborate cross-functionally in Agile environments, address client needs, and ensure compliance with security, governance, and accessibility standards. This remote role requires occasional travel and eligibility for Public Trust or suitability determination.

Lead hands-on software design and development for scalable .NET services and web applications on Azure. Modernize legacy systems, design APIs and integrations, improve CI/CD, testing, observability, and secure coding practices, and mentor engineers. Collaborate with operations and business leaders to solve freight-related challenges through software while contributing to technical direction and engineering standards.

Leads development and support of enterprise .NET applications, coordinates offshore teams, provides technical guidance, reviews code, translates business requirements into technical solutions, and ensures architecture and quality standards. The role includes sprint planning, backlog refinement, release activities, production troubleshooting, mentoring junior developers, and maintaining technical documentation.

Build and lead large-scale distributed, API-driven systems using C# and .NET. Develop AI-powered agents, intelligent workflows, automation, and observability capabilities across CoStar’s data platform. Design robust software, data models, and integrations with SQL Server and cloud services. Collaborate with Product, Research, and Data teams, establish engineering standards, conduct code reviews, and apply telemetry to improve reliability and operational efficiency.

Develop and maintain C#/.NET applications throughout the software development lifecycle, including requirements analysis, architecture, coding, testing, debugging, integration, and configuration. Collaborate with clients and team members to prioritize development backlogs and plan releases. Build reliable, reusable code, analyze system requirements, and support applications using .NET technologies, SQL, APIs, JavaScript, and related systems.

Develop and maintain .NET applications using C#, ASP.NET Web Forms, MVC, Web API, WCF, Entity Framework, and client-side technologies. Responsibilities include REST services, T-SQL programming, query tuning, index management, and web development with HTML, CSS, JavaScript, AngularJS, jQuery, and Knockout. Candidates must complete an online technical screening within 24 hours of submission.

Develop and maintain scalable full-stack web applications using Angular, C#, .NET, Node.js, and related technologies. Collaborate with cross-functional teams, deliver new features, optimize performance, resolve defects, maintain code quality and automation, and mentor junior developers. The role requires database, API, cloud, and modern development experience, along with strong communication and problem-solving skills. U.S. citizenship and an active Secret clearance are required.