We9re hiring two Senior .NET Engineers to support a healthcare industry client on key software development initiatives. The roles will focus on building and enhancing integration solutions, maintaining and modernizing legacy systems, and implementing AI-driven security enhancements across web applications. We9re looking for engineers who are comfortable working across modern and legacy .NET environments and who actively use AI-assisted development tools as part of their daily workflow.
This position is ideal for someone who is systems-oriented, enjoys learning new tools and technologies, and can work effectively both independently and as part of a collaborative team.
Location: Remote (must overlap with 8:00 AM-5:00 PM MST business hours)
Roles and responsibilities:
- Design, build, and maintain C# APIs and web applications, including work on both modern .NET and legacy ASP.NET Web Forms/MVC codebases.
- Use AI-assisted development tools (e.g., Claude Code) as a core part of your engineering workflow, from implementation to code review.
- Depending on assignment: contribute to system integration and legacy modernization efforts, or implement security monitoring features (e.g., sensitive-data access alerts) across dozens of production web applications.
- Build and maintain automated regression test coverage for changes you ship.
- Collaborate with client engineering teams on code reviews, CI/CD, and production releases.
Required skills and experience:
- Senior-level, full-stack .NET engineer with software architecture experience.
- Strong hands-on experience with C# APIs and web application development, plus working knowledge of legacy ASP.NET Web Forms/MVC.
- Recent, active experience using AI-assisted development tools (Claude Code or similar).
- Experience with ASP.NET Core / recent .NET versions, CI/CD pipelines, and SQL Server or Oracle.
- Comfortable writing or maintaining automated tests (e.g., Playwright) for regression coverage.
- Strong written and verbal communication skills in English.
- Able to work from a private, dedicated workspace with secure internet (client security requirement).
Nice to Have
- Experience with Kafka, Change Data Capture (CDC) patterns, or event-driven architecture.
- Background in healthcare or other highly regulated industries.
- Experience modernizing legacy websites/applications.
- Familiarity with front-end tooling such as HTML, CSS, JavaScript, and Bootstrap.
