Senior .NET Developer

The Senior .NET Developer will design, develop, and maintain enterprise applications while leveraging AI-powered coding tools such as Claude and Cursor to accelerate software development. This role will serve as a senior technical contributor responsible for validating AI-generated code, ensuring quality, security, and performance, and establishing best practices for AI-assisted development. The ideal candidate has extensive C#/.NET experience, strong Blazor and Azure Cosmos DB expertise, and the ability to independently deliver solutions while collaborating with architects, product owners, and security teams.

Duties

• Design, develop, and maintain application features using C#, .NET, Blazor, and ASP.NET Core REST APIs.

• Review and validate AI-generated code from tools such as Claude and Cursor for accuracy, security, performance, and maintainability.

• Determine whether AI-generated output should be approved, refactored, discarded, or escalated for additional review.

• Establish and refine code review standards, quality checks, and guardrails for AI-assisted development.

• Design and optimize Azure Cosmos DB data models, partitioning strategies, indexing, and queries.

• Develop secure REST APIs and implement authentication and authorization through Okta using OIDC and OAuth 2.0.

• Create effective prompts and agent instructions to improve the quality and reliability of AI-generated solutions.

• Identify potential bugs, security vulnerabilities, hallucinated APIs, and unnecessary complexity in AI-generated code.

• Document technical decisions, development patterns, and review standards for ongoing team use.

• Collaborate with product owners, architects, and security teams to deliver reliable solutions.

Required Skills

• 8+ years of professional software development experience, including at least 5 years of senior-level C#/.NET development.

• Proven ability to independently deliver technical solutions as a senior developer or technical lead.

• Strong hands-on experience with Microsoft Blazor (Server and/or WebAssembly), including component design, state management, and performance optimization.

• Experience designing and developing REST APIs using ASP.NET Core Web API, including API versioning, error handling, and OpenAPI/Swagger.

• Hands-on experience with Azure Cosmos DB (NoSQL), including data modeling, partition keys, indexing, RU optimization, and change feed.

• Experience integrating Okta for single sign-on (SSO), OIDC/OAuth 2.0, token management, and role- or claim-based authorization.

• Practical experience using AI coding assistants and agents, such as Claude or Cursor, in production development environments.

• Strong code review and debugging skills, particularly when evaluating AI-generated code for correctness, security, and maintainability.

• Knowledge of application security best practices, including OWASP principles, secrets management, and input validation.

Preferred Skills

• Experience with prompt engineering and AI agent workflow design, including rules files, context management, and tool integration.

• Familiarity with the Claude API and/or Model Context Protocol (MCP).

• Experience with CI/CD pipelines using Azure DevOps or GitHub Actions.

• Knowledge of automated testing frameworks, including xUnit, bUnit, and integration testing.

• Experience with Azure services such as App Service, Key Vault, and Application Insights.

• Background building internal developer tools, platforms, or productivity solutions.

• Anthropic Claude certifications or training credentials, including Claude Certified Architect, Claude Certified Developer, Claude Certified Associate, or Anthropic Academy courses. These credentials are a plus but are not required.