Senior Software Engineer – .NET & AI-Assisted Development

Apexon; Dillsburg (York County); On-site; USD 120,000 - 190,000; Full time

Job summary

Apexon is seeking an accomplished software engineer with advanced Microsoft development expertise and hands-on AI integration experience to accelerate professional engineering workflows.

You will contribute to building enterprise applications, influence architectural decisions, and mentor teams while maintaining high coding standards and secure, scalable solutions. The role emphasizes 8+ years of C#/.NET, Blazor, Cosmos DB, and secure API design.

Qualifications

• 8+ years of professional software development.
• 5+ years with C# and .NET.
• Experience building modern web apps with Blazor Server/WebAssembly.
• Expertise in ASP.NET Core Web APIs with API versioning and Swagger.

Responsibilities

• Deliver complex engineering solutions independently or lead initiatives.
• Maintain high coding standards while using AI to accelerate delivery.
• Assess AI-generated code for defects, security, and performance.
• Contribute to secure engineering practices and OWASP guidelines.

Skills

C# & .NET

Blazor

ASP.NET Core

Web APIs

OpenAPI/Swagger

Azure Cosmos DB

Okta Identity

SSO / OIDC

AI coding tools

CI/CD tools

Tools

Azure DevOps

GitHub Actions

xUnit

bUnit

Azure App Service

Key Vault

Application Insights

Job description

We are seeking an accomplished software engineer who brings advanced Microsoft development expertise and practical experience incorporating AI into professional engineering workflows.

This role offers the opportunity to build sophisticated enterprise applications, influence technical decisions, and establish effective practices for using AI-powered development tools.

We are looking for someone who can work independently, take ownership of complex deliverables, and bring strong technical judgment to every stage of development.

What You'll Bring

Software Engineering Expertise

• 8+ years of professional software development, including at least 5 years working at a senior level with C# and .NET.
• Strong experience developing modern web applications using Blazor Server or WebAssembly, including reusable components, application state management, and performance tuning.
• Expertise in ASP.NET Core Web APIs, with experience implementing API versioning, structured error handling, and OpenAPI/Swagger documentation.
• Proven ability to independently deliver complex engineering solutions or lead technical initiatives.

Cloud Data & Identity Management

• Hands-on Azure Cosmos DB experience, including NoSQL architecture, partition key selection, request unit (RU) optimization, indexing strategies, and change feed processing.
• Experience integrating Okta-based identity solutions, including SSO, OAuth 2.0, OpenID Connect, secure token handling, and role- or claim-based authorization.
• Strong understanding of secure application engineering, including OWASP practices, secrets management, and input validation.
• Practical experience using Claude, Cursor, or comparable AI coding assistants in production development environments.
• Ability to assess AI-generated code for functional defects, security weaknesses, nonexistent APIs, performance issues, and unnecessary complexity.
• Sound engineering judgment to determine when AI-generated solutions should be adopted, improved, or replaced.
• Experience maintaining high coding standards while using AI to accelerate software delivery.

Additional Experience We Value

• Claude Code, Anthropic API integrations, or Model Context Protocol (MCP).
• Prompt engineering, agent instructions, and context management.
• CI/CD pipelines using Azure DevOps or GitHub Actions.
• Automated testing with xUnit, bUnit, or integration testing frameworks.
• Azure App Service, Key Vault, and Application Insights.
• Experience developing internal engineering tools.
• Relevant Anthropic or Claude training and certifications.

Why Consider This Opportunity?

You’ll work at the intersection of established software engineering practices and emerging AI capabilities, with opportunities to influence how intelligent development tools are adopted while delivering secure, scalable applications.