Top .NET Developer Jobs in Denver & Boulder, CO

Develop, test, deploy, and maintain .NET-centric web applications using C#, Angular 17+, and Azure. Build and consume REST APIs, work with SQL Server, source control, CI/CD pipelines, and collaborate on code reviews, debugging, performance optimization, and third-party integrations.

Develop and maintain scalable software solutions, mentor developers, and integrate AI tools. Collaborate on technical solutions aligned with business goals.

Develop, maintain, and optimize backend services and APIs for a scalable healthcare platform using Node.js, Java, or .NET. Integrate third-party services, ensure performance, reliability, and security, collaborate with cross-functional teams, participate in code reviews, and work in an Agile environment to deliver high-quality server-side applications.

Lead technical direction for a major product domain, reduce architectural debt, mentor engineers, standardize AI-agent workflows, and design scalable backend solutions integrating LLMs and cloud services. Drive cross-team RFCs, cookbook standards, and adopt agentic AI tooling while balancing security, quality, and delivery.

Lead design and delivery of scalable, reliable software using C#/.NET, SQL Server, React, and Azure. Own complex initiatives from design through operations, mentor engineers, improve CI/CD, observability, and apply DDD/TDD/VSA practices. Use modern APIs, microservices or modular monoliths, and AI-assisted tooling to improve delivery.

Seeking a Senior Full Stack .NET Developer to work on a social good project, with strong skills in C#, AngularJS, design, and UX. Requires 5+ years of experience.

The Staff Engineer will leverage 5+ years of experience in C#, JavaScript, and frameworks to lead and innovate solutions in a collaborative environment.

Provide technical leadership and application development for Microsoft-centric solutions: gather requirements, design architecture, mentor teams, manage projects, develop and test .NET/SQL applications, and implement integrations (SharePoint, BizTalk, Azure, Dynamics CRM, web services). Client-facing role with up to 25% travel.

Senior .NET Developer to build a Compliance System (ORCA). Develop distributed RESTful web/cloud services and Web APIs using ASP.NET/C#, backend databases (MongoDB, SQL Server 2012), and frontend tech (AngularJS, HTML/JavaScript, Bootstrap). Work with AWS and Pivotal products; deliver enterprise-grade solutions.

Develop, test, debug, and maintain .NET applications and systems using ASP.NET, MVC, C#, and SQL. Design/enhance databases or coordinate with DBAs, diagnose and resolve software issues, and communicate technical information to non-technical clients.

As a Sr. Software Engineer at Bloomerang, you will lead technical direction, mentor engineers, and enhance SaaS solutions while utilizing .NET and AI tools. You will ensure scalable, maintainable applications, advocate for Agile workflows, and focus on quality outcomes in software development.

Design, develop, test, and maintain scalable C#/.NET applications and RESTful APIs. Build data-driven platforms, implement CI/CD and DevOps practices, deploy containerized apps (Docker/Kubernetes) on AWS, troubleshoot production issues, and collaborate on architecture, code reviews, and observability improvements.

Lead development of maintainable .NET applications within a small team, apply test-driven development, coach client teams on modern software practices, and continuously improve technical skills.

Senior .NET full-stack developer responsible for custom application development, API integrations, database optimization, deployments, troubleshooting, performance, security, and production support using .NET/C#, ASP.NET Core, SQL, modern frontend frameworks, cloud, and CI/CD.

Full‑stack .NET developer responsible for designing, developing, and maintaining internal and external enterprise applications across framework, middle-tier, and database layers. Troubleshoot performance and code issues, deliver high‑quality, test‑driven releases, and collaborate on fast delivery schedules with a cross‑functional web team.

Full‑stack senior .NET developer responsible for 80% hands‑on development, code reviews, mentoring, and 20% testing, deployment, and design. Deliver clean, well‑documented, high‑performance applications using C#, ASP.NET/MVC, SQL Server and UI libraries, integrate with web services, and guide teammates to robust solutions.

Design and develop middle-tier applications and services using Visual Studio 2013, .NET 4.5 and C#. Implement and maintain web/WCF/windows services, perform unit and integration testing, tune .NET performance, create installation/maintenance documentation, collaborate with development, QA, product and project teams, and work in an Agile environment to improve processes and deliver multi-tier applications.

Contract remote .NET/Kentico web developer to build interactive, dynamic websites. Requires front-end web development experience and familiarity with the Kentico CMS. Six-week engagement.

Design, develop, and maintain C#/.NET web applications and services (REST/SOAP). Implement client-side features using MVC/JavaScript frameworks, optimize performance and memory/threading, perform SQL Server tuning, and write unit/integration tests. Translate business requirements into scalable, secure distributed solutions.

Develop and maintain .NET-based web applications and services (REST/SOAP). Work on full-stack features using ASP.NET, WebAPI, client-side frameworks (Angular, jQuery, MVC), and SQL Server. Diagnose and optimize performance, threading, and memory usage. Implement secure, scalable, multi-threaded distributed systems, write unit/integration tests, and translate business requirements into technical designs.

Develop and maintain .NET web applications using ASP.NET Web Forms/MVC and C#. Build responsive UIs with JavaScript/jQuery, HTML, CSS and Bootstrap. Implement SOA via WCF/Web Services (SOAP/REST), work with MS SQL/Oracle, participate in design/architecture reviews and full SDLC within financial services and global delivery environments.

Develop and maintain web applications using ASP.NET, C#, AngularJS and SQL Server. Produce design deliverables, perform reviews, unit test planning, independent testing and release sign-off. Work collaboratively with clients and global teams in the Audit/Advisory domain.

Design, develop, and maintain .NET/C# web applications and services (REST/SOAP). Build scalable, multi-threaded distributed systems; profile and optimize memory, threading, and performance; implement client-side features (MVC, JavaScript, Angular, Bootstrap); perform T-SQL and SQL Server performance tuning; create unit and integration tests; translate business requirements into technical designs.

Design, develop, and optimize .NET web applications and services using C#, ASP.NET, WCF/WF, Web API and REST/SOAP. Implement client-side features (Angular, jQuery, MVC), ensure security, perform DB tuning on SQL Server, write unit/integration tests, and resolve threading/memory/performance issues for scalable distributed systems.

Develop and maintain .NET web applications using ASP.NET Web Forms/MVC and C#. Build responsive UIs with JavaScript/jQuery, HTML/CSS/Bootstrap. Implement SOA with WCF, SOAP and REST. Work with MS SQL/Oracle, participate in SDLC, design and architecture reviews, and collaborate in a global delivery, financial-services environment.