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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # NET Software Engineer - **Company:** Vector Airport Systems, LLC - **Location:** United States (Remote available) - **Experience:** Experienced - **Contract:** Permanent contract - **Skills:** ASP.NET, .NET Framework, Application Performance Management, Build Automation, Automation of Tests, Microsoft Azure, Bioinformatics, C Sharp (Programming Language), Software as a Service, Code Review, Databases, Continuous Integration, Data Validation, Dependency Injection, DevOps, Entity Framework, Github, Internet Information Services (IIS), Network Layer, Microsoft SQL Server, SQL Azure, OAuth, Object-Oriented Software Development, Open Web Application Security, Secure Coding, Software Deployment, Software Engineering, Data Logging, Git Flow, Integration Tests, Asynchronous Programming, Restful APIs, Key Vault, Web Api - **Published:** October 27, 2026 - **Apply:** https://www.builtincolorado.com/job/net-software-engineer/11884112?handler=ApplyRedirect ## About the Role * 4+ years of professional software development in C# / .NET, including production experience with ASP.NET Core and Web API. * Strong SQL Server skills - writing and tuning queries, designing schemas, and working with Entity Framework or a similar ORM against Azure SQL or SQL Server. * Experience building or maintaining ERP, billing, invoicing, or other financial/transactional systems including rate calculations, ledger or accounting integrations, and reporting is strongly preferred, along with an appreciation for the accuracy and audit requirements that come with handling money. * Hands-on experience building and deploying applications on Microsoft Azure (App Services, Azure SQL, Storage, Key Vault, Application Insights). * Experience modernizing legacy .NET Framework applications to modern .NET, or a clear understanding of what that migration involves. * Working knowledge of Git-based workflows and CI/CD in Azure DevOps or GitHub Actions - branching, pull requests, and automated builds and tests. * Solid grounding in software engineering fundamentals: object-oriented design, dependency injection, asynchronous programming, REST API design, and automated testing. * Familiarity with Windows Server and IIS hosting, and comfortable troubleshooting across the application, database, and network layers. * Practical understanding of secure development OWASP Top 10, authentication with Entra ID / OAuth 2.0, and handling secrets and configuration safely. * Clear written and verbal communication; comfortable working directly with non-engineers and following work through to production. * U.S. based residency and work authorization. * Ability to work 9:00am to 5:00pm Eastern Time, Monday through Friday. ## Description Remote Hiring Remotely in United States Mid level Remote Hiring Remotely in United States Mid level Build and maintain C#/.NET backend services, APIs, web applications, ERP and billing features, and financial integrations. Modernize legacy .NET Framework applications onto Azure, optimize SQL Server and Azure SQL data access, create automated tests, support CI/CD, instrument production systems, and implement secure authentication and configuration. Troubleshoot application, database, and hosting issues while collaborating with DevOps, architects, product leaders, and stakeholders. The summary above was generated by AI, * Design, build, and maintain backend services, APIs, and web applications in C# / .NET (ASP.NET Core, Web API, Entity Framework) supporting production airport workloads. * Develop and extend features within our ERP and billing system rate and fee calculation, invoicing and billing cycles, accounts receivable, general ledger integration, and financial reporting - with the accuracy, auditability, and data integrity that financial software demands. * Modernize legacy .NET Framework and Windows/IIS-hosted applications, moving them onto modern .NET and Azure App Services, containers, or managed alternatives. * Design and optimize data access against SQL Server and Azure SQL schema design, queries, stored procedures, migrations, and performance tuning. * Build for the cloud we run on: App Services, Azure Storage, Key Vault, managed identities, Private Endpoints, and configuration patterns that work cleanly across multiple environments and tenants. * Write automated unit and integration tests and keep builds green in GitHub Actions; partner with DevOps on build, release, and environment promotion. * Instrument applications with Application Insights and structured logging so that production issues are diagnosed from data rather than guesswork. * Write secure code by default input validation, authentication and authorization with Entra ID, secrets kept out of source and in Key Vault, and OWASP Top 10 awareness in every review. * Participate in code reviews, design discussions, and production readiness reviews; document decisions and raise the bar for engineering quality across the team. * Troubleshoot and resolve production issues across the application, database, and hosting layers, and feed the fixes back into code and tests. * Work with product and stakeholders to turn requirements into working, supportable software., Our goal is to ensure a fair, transparent, and engaging process for every candidate. Here's what you can expect once your application is submitted: 1. Assessment: Qualified candidates will be invited to complete a brief online assessment. 2. First Round Video Interview: Selected candidates will participate in an initial video interview. 3. Technical Interview: Candidates advancing to this round will complete a live video technical interview. 4. Final Interview: Top candidates will participate in a final video interview before we make our final selection