Backend Software Engineer II - C#/.NET & AI Tools

Taxwell; United States; Remote; USD 90,000 - 150,000; Full time

Job summary

Taxwell in United States is seeking a Software Engineer II to support and enhance a mix of legacy and modern applications. This backend and platform-leaning role centers on C#/.NET, SQL Server, services, integrations, authentication, and infrastructure, with occasional work on legacy WebForms or support-facing UI.

You will join a collaborative team, use AI-assisted tools in development, and be responsible for code quality, security, and production readiness while improving observability and

Qualifications

• Strong hands-on experience with C# and .NET application development.
• Strong SQL Server skills, including stored procedures and data-driven troubleshooting.
• Experience developing and troubleshooting backend applications, services, and integrations.
• Ability to understand unfamiliar or legacy code and make safe, focused changes.
• Experience diagnosing production issues using application logs, database analysis, and other operational data.
• AI development tools such as Claude Code, or Cursor Familiarity with authentication and authorization concepts such as OIDC, claims, roles, sessions, or platforms such as Okta.
• Experience with source control, CI/CD pipelines, testing, and software deployment practices.
• Experience using AI-assisted development tools or a strong willingness to incorporate them into day-to-day engineering workflows.
• Ability to work effectively with both technical and non-technical partners.
• Nice to Have: Experience with VB.NET, IIS, Windows services, Vue/TypeScript, & AWS services.

Responsibilities

• Develop, maintain, and enhance primarily backend applications and services using C#/.NET and SQL Server.
• Troubleshoot production issues across application code, databases, authentication, configuration, logging, integrations, and deployment environments.
• Work with both modern and legacy .NET systems and make safe, focused improvements to existing applications.
• Contribute to the incremental modernization of legacy systems, including authentication, deployment, observability, and operational improvements.
• Work across services, databases, integrations, and support-facing applications when problems cross system boundaries.
• Create and maintain technical documentation, troubleshooting guides, and investigation notes.
• Collaborate with Engineering, Product, IT, Help Desk, Customer Success, and other teams to resolve technical issues.
• Use AI-assisted engineering tools for development, code analysis, testing, debugging, and documentation, while critically evaluating AI-generated output before it is used in production.

Skills

C# / .NET

SQL Server

Backend services

OIDC / Auth

CI/CD pipelines

AI-assisted development

Legacy code understanding

Team collaboration

Tools

Claude Code

Okta

VS Code

AWS

Job description

Taxwell in United States is seeking a Software Engineer II to support and enhance a mix of legacy and modern applications. This backend and platform-leaning role centers on C#/.NET, SQL Server, services, integrations, authentication, and infrastructure, with occasional work on legacy WebForms or support-facing UI.

You will join a collaborative team, use AI-assisted tools in development, and be responsible for code quality, security, and production readiness while improving observability and