Senior C#/.NET Software Engineer – AI & Agentic Systems

The Phoenix Group; New York (NY); On-site; USD 140,000 - 170,000; Full time

Job summary

The Phoenix Group Advisors in New York seeks a Senior Software Engineer with a strong C#/.NET foundation who has expanded into AI development using Python, LLMs, and agentic technologies. This hands-on role focuses on building production applications that blend traditional enterprise software with emerging AI capabilities.

The ideal candidate has years designing C#/.NET applications and backend systems and more recently building AI-powered apps, agents, MCP integrations, and Python-based AI

Qualifications

• 5+ years of professional software engineering experience
• Strong C#/.NET proficiency, including REST APIs
• Experience integrating LLMs and AI agents into production software
• Cloud experience with Azure or AWS

Responsibilities

• Design, develop, and maintain enterprise apps using C#, .NET, ASP.NET MVC/Core, SQL, and modern web tech.
• Build and integrate AI-powered functionality into existing and new apps.
• Develop Python-based AI services, APIs, workers, and automation workflows.
• Design and build LLM-powered applications, agents, and agentic workflows.
• Develop and integrate MCP servers and MCP-enabled tools.
• Integrate apps with OpenAI, Claude, Ollama, or similar LLM platforms.
• Secure integrations between AI services and internal systems.
• Focus on scalable, maintainable, testable, secure, high-performance software.
• Help establish engineering standards for agentic and AI-assisted development.
• Evaluate new AI tools and model platforms; participate in architecture and code reviews.
• Collaborate with stakeholders to translate requirements into production solutions.

Skills

C# / .NET

ASP.NET MVC / Core

SQL

REST APIs

Python AI development

OpenAI / LLM APIs

AI agents / agentic workflows

CI / CD

Security & auth

Azure / AWS

Tools

MCP

Ollama

Claude

Azure DevOps

Job description

We are seeking a Senior Software Engineer with a strong C#/.NET engineering foundation who has expanded into modern AI development using Python, LLMs, and agentic technologies.

This is a hands‑on engineering position focused on building production applications that combine traditional enterprise software development with emerging AI capabilities. The ideal candidate has spent several years designing and developing C#/.NET applications and backend systems and more recently has been building AI-powered applications, agents, MCP integrations, and Python-based AI services.

Responsibilities

• Design, develop, and maintain enterprise applications and services using C#, .NET, ASP.NET MVC/Core, SQL, and modern web technologies.
• Build and integrate AI-powered functionality into existing and new software applications.
• Develop Python-based AI services, APIs, workers, and automation workflows.
• Design and build LLM-powered applications, agents, and agentic workflows.
• Develop and integrate MCP servers and MCP-enabled tools for enterprise applications.
• Integrate applications with commercial and locally hosted LLMs using technologies such as OpenAI APIs, Claude, Ollama, or similar platforms.
• Build secure integrations between AI services, enterprise applications, APIs, databases, and internal systems.
• Design reliable production software with an emphasis on scalability, maintainability, testing, security, and performance.
• Help establish engineering standards and best practices for agentic and AI-assisted software development.
• Evaluate emerging AI development tools, frameworks, coding agents, and model platforms.
• Participate in architecture discussions, code reviews, troubleshooting, and technical knowledge sharing.
• Collaborate with business stakeholders and engineering teams to translate business requirements into production‑ready technical solutions.

Core Qualifications

• 5+ years of professional software engineering experience, ideally with significant hands‑on experience in C#/.NET.
• Strong experience building production applications using C#, .NET / .NET Core, ASP.NET MVC/Core, REST APIs, and SQL.
• Strong software engineering fundamentals including application architecture, APIs, object‑oriented development, testing, CI/CD, and production deployment.
• Hands‑on Python development, particularly for AI applications, backend services, APIs, or automation.
• Experience integrating LLMs into production software applications.
• Experience working with OpenAI APIs or comparable LLM APIs/platforms.
• Experience building AI agents, agentic workflows, or AI‑enabled application features.
• Hands‑on experience with Model Context Protocol (MCP), ideally including development of custom MCP servers or tools.
• Understanding of authentication, authorization, APIs, and secure service‑to‑service communication.
• Experience with cloud environments such as Azure or AWS.
• Ability to take ownership of complex engineering problems from architecture and design through production deployment.

PREFERRED QUALIFICATIONS:

• Experience in the legal industry.
• Experience with iManage Cloud API, PowerShell, Salesforce, SharePoint, Azure DevOps, Aderant, Workday.

The Phoenix Group Advisors is an equal opportunity employer. We are committed to creating a diverse and inclusive workplace and prohibit discrimination and harassment of any kind based on race, color, religion, gender, sexual orientation, gender identity or expression, national origin, age, genetic information, disability, or veteran status. We strive to attract talented individuals from all backgrounds and provide equal employment opportunities to all employees and applicants for employment.