Senior Developer (AI)

Apexon; Mechanicsburg (Cumberland County); Hybrid; USD 130,000 - 170,000; Full time

Benefits offered by this job

Health Insurance

401K Plan

Life Insurance

Paid Vacations & Holidays

Skill Development

Job summary

Apexon in Mechanicsburg, PA, is seeking a Senior Developer (AI) with strong C#/.NET and hands-on AI tooling experience. The role is hybrid, onsite Tue/Thu, collaborating with product owners, architects, and security teams to build enterprise applications using Blazor and REST APIs.

You will validate AI-generated code, design scalable data models in Azure Cosmos DB, implement Okta-based authentication, and lead reviews as a senior contributor or technical lead. A Bachelor's degree is preferred.

Qualifications

• 8+ years of professional software development experience, including at least 5 years of senior‑level C#/.NET development.
• Proven ability to deliver independently as a senior contributor or technical lead.
• Microsoft Blazor Server and/or WebAssembly, including component design, state management, and performance optimization.
• REST API design and development using ASP.NET Core Web API, including versioning, error handling, and OpenAPI/Swagger.
• Azure Cosmos DB (NoSQL), including data modeling, partition keys, RU optimization, indexing, and change feed.
• Okta integration, including SSO, OIDC/OAuth 2.0, token handling, and role‑based or claim‑based authorization.
• Hands‑on experience using AI coding assistants and agents such as Claude, Cursor, or similar tools in production workflows.
• Strong code review skills, including identifying subtle bugs, security vulnerabilities, hallucinated APIs, and over‑engineered code.
• Knowledge of security best practices, including OWASP, secrets management, and input validation.

Responsibilities

• Review and validate AI‑generated code and other outputs from tools such as Claude and Cursor for correctness, security, performance, and maintainability.
• Determine whether AI‑generated outputs should be approved, refactored, discarded, or escalated for human or specialist review.
• Define and refine review criteria, guardrails, and quality checks for AI‑generated outputs.
• Design and optimize Azure Cosmos DB data models, partitioning strategies, and queries.
• Build and secure REST APIs, integrating authentication and authorization through Okta using OIDC/OAuth 2.0.
• Develop effective prompts and agent instructions, and provide feedback to improve AI output quality.
• Document technical decisions, reusable patterns, and review criteria to ensure knowledge transfer and continuity.
• Collaborate with product owners, architects, and security teams.
• Design, develop, and maintain application features using Blazor, .NET, and REST APIs.

Skills

C# / .NET

Blazor

ASP.NET Core

Azure Cosmos DB

Okta

AI tooling

Security practices

Code review

REST APIs

Education

Bachelor's degree

Tools

Claude API

Cursor

Azure DevOps

GitHub Actions

xUnit

Azure App Service

Job description

We are hiring for a Senior Developer (AI) opportunity.

Location: Mechanicsburg, PA 17050

Positions: 4

Work Arrangement: Hybrid, onsite in Mechanicsburg on Tuesdays and Thursdays

Role Overview

We are seeking experienced Senior AI Developers with strong C#/.NET development expertise and hands‑on experience using AI coding assistants and agents such as Claude and Cursor in production environments.

The ideal candidates will bring expertise in Microsoft Blazor, ASP.NET Core Web API, Azure Cosmos DB, and Okta integration. This role focuses on validating AI-generated code, maintaining engineering quality and security standards, designing scalable APIs and data models, and building enterprise applications using Blazor and .NET.

Candidates should be capable of working independently as senior contributors or technical leads, collaborating with product owners, architects, and security teams.

Required Skills

• 8+ years of professional software development experience, including at least 5 years of senior‑level C#/.NET development.
• Proven ability to deliver independently as a senior contributor or technical lead.
• Microsoft Blazor Server and/or WebAssembly, including component design, state management, and performance optimization.
• REST API design and development using ASP.NET Core Web API, including versioning, error handling, and OpenAPI/Swagger.
• Azure Cosmos DB (NoSQL), including data modeling, partition keys, RU optimization, indexing, and change feed.
• Okta integration, including SSO, OIDC/OAuth 2.0, token handling, and role‑based or claim‑based authorization.
• Hands‑on experience using AI coding assistants and agents such as Claude, Cursor, or similar tools in production workflows.
• Strong code review skills, including identifying subtle bugs, security vulnerabilities, hallucinated APIs, and over‑engineered code.
• Knowledge of security best practices, including OWASP, secrets management, and input validation.

Preferred Skills

• Prompt engineering and AI agent workflow design, including rules files, context management, and tool usage.
• Experience with the Claude API or Model Context Protocol (MCP).
• CI/CD experience with Azure DevOps or GitHub Actions.
• Automated testing experience using xUnit, bUnit, and integration testing.
• Experience with Azure services such as App Service, Key Vault, and Application Insights.
• Experience building internal developer tools or platforms.

Nice to Have: Claude Certifications

Candidates holding any of the following certifications or course certificates will be viewed favorably:

• Claude Certified Architect (Foundations or Professional).
• Anthropic Academy course certificates, such as Building with the Claude API, Introduction to Model Context Protocol, Claude Code, or AI Fluency.

Key Responsibilities

• Review and validate AI‑generated code and other outputs from tools such as Claude and Cursor for correctness, security, performance, and maintainability.
• Determine whether AI‑generated outputs should be approved, refactored, discarded, or escalated for human or specialist review.
• Define and refine review criteria, guardrails, and quality checks for AI‑generated outputs.
• Design and optimize Azure Cosmos DB data models, partitioning strategies, and queries.
• Build and secure REST APIs, integrating authentication and authorization through Okta using OIDC/OAuth 2.0.
• Develop effective prompts and agent instructions, and provide feedback to improve AI output quality.
• Document technical decisions, reusable patterns, and review criteria to ensure knowledge transfer and continuity.
• Collaborate with product owners, architects, and security teams.
• Design, develop, and maintain application features using Blazor, .NET, and REST APIs.

Education Requirement

Bachelor’s degree in Computer Science, Information Technology, Engineering, Business Administration, or a related field is preferred.

Our Commitment to Diversity & Inclusion

Did you know that Apexon has been Certified™ by Great Place To Work®, the global authority on workplace culture, in each of the four regions in which it operates: USA for the seventh time in 2026, India for the tenth consecutive time in 2026, the UK for the fourth time in 2026, and Mexico for the second time in 2026.

Apexon is committed to being an equal opportunity employer and promoting diversity in the workplace. We take affirmative action to ensure equal employment opportunity for all qualified individuals. Apexon strictly prohibits discrimination and harassment of any kind and provides equal employment opportunities to all qualified individuals without regard to gender, race, color, ethnicity or national origin, age, disability, religion, sexual orientation, gender identity or expression, veteran status, or any other applicable characteristics protected by law.

You can read about our Job Applicant Privacy policy here: Job Applicant Privacy Policy on apexon.com.

Our Commitment to Environment

Actively contribute to Apexon's commitment to environmental responsibility by following sustainable practices and supporting ESG initiatives.

Our Perks and Benefits

Our benefits and rewards program has been thoughtfully designed to recognize your skills and contributions, elevate your learning experience, and provide care and support for you and your loved ones.

We also offer:

• Health Insurance with Dental & Vision
• 401K Plan
• Life Insurance, STD & LTD
• Paid Vacations & Holidays
• Continuous Skill Based Development and Career Advancement Opportunities

Job Location :

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