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Senior C# / .NET Software Developer

InfotechStaffing

Philadelphia, PA

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JOB DETAILS
SALARY
$170,000–$200,000 Per Year
JOB TYPE
Full-time, Employee
SKILLS
A/B Testing, Amazon Web Services (AWS), Application Programming Interface (API), Artificial Intelligence (AI), Business Intelligence, Cloud Computing, Computer Science, Conversation Engine, Data Analysis, Docker, Git, Java, Machine Learning, Mathematics, Microsoft .NET, Microsoft C# (C Sharp), Microsoft Product Family, Microsoft SQL Server, Microsoft Windows Azure, Natural Language Processing (NLP), Object Oriented Programming (OOP) Languages, Process Improvement, Product Lifecycle, Programming Languages, Project/Program Management, Python Programming/Scripting Language, Qlik, REST (Representational State Transfer), Software Development, Software Development Lifecycle (SDLC), System Integration (SI), Time Management, Training/Teaching
LOCATION
Philadelphia, PA
POSTED
2 days ago

Senior C# / .NET Software Developer – (Hybrid) – Philadelphia, PA

Location: Philadelphia, PA 19105 (Center City)
Schedule: Hybrid – 3 Days Onsite / 2 Days Remote
Job Type: Full-Time, Permanent
Salary: $170,000 to $200,000

***Local Candidates Only
This position requires working onsite in the Philadelphia area three days per week.
Relocation assistance is not available.

About the Role

We are seeking a Senior Software Developer to help build next-generation AI-powered applications, including ChatGPT-based conversational systems, while working across the Microsoft technology stack.

In this role, you will develop enterprise software using technologies such as C#, .NET, and SQL Server, while helping expand the organization’s capabilities in AI, large language models (LLMs), and intelligent automation.

This is an exciting opportunity for a developer who enjoys building scalable applications, exploring emerging AI technologies, and collaborating closely with both technical teams and business stakeholders.

Key Responsibilities

Software Development

  • Design and develop enterprise applications using C#, .NET, and SQL Server
  • Manage full lifecycle software development including design, coding, testing, and deployment
  • Develop and maintain RESTful APIs and backend services
  • Write clean, scalable, and well-documented code

AI & ChatGPT Development

  • Design and implement ChatGPT / LLM-based conversational systems
  • Build APIs and services that support chatbot communication across multiple channels
  • Conduct data analysis and A/B testing to improve chatbot performance
  • Evaluate emerging AI, NLP, and machine learning technologies

Architecture & Innovation

  • Evaluate and integrate new technologies aligned with business needs
  • Contribute to modernization of systems and development frameworks
  • Work within an environment that includes custom-built applications, third-party platforms, and system integrations

Collaboration

  • Work closely with developers, stakeholders, and end users
  • Participate in Agile development processes
  • Share ideas to improve systems, business processes, and development tools

Technology Environment

  • C#
  • .NET / .NET Core
  • SQL Server
  • RESTful APIs
  • OpenAI / conversational AI models
  • Natural Language Processing (NLP)
  • Azure or AWS cloud platforms
  • Docker and Kubernetes
  • Git-based repositories
  • Qlik (Business Intelligence platform)

Required Qualifications

  • Bachelor’s degree in Computer Science, Engineering, Mathematics, or related discipline
    (Relevant experience may substitute for education)
  • 10+ years of progressive software development experience
  • Strong experience with one or more languages including:
    • C#
    • .NET
    • Python
    • Java
  • Experience developing RESTful APIs
  • Experience working with cloud platforms (Azure or AWS)
  • Familiarity with containerization technologies such as Docker or Kubernetes
  • Experience using Git-based code repositories
  • Ability to work across all phases of the Software Development Life Cycle

Why Join Us

  • Build real-world AI and ChatGPT-powered solutions
  • Work with a modern Microsoft technology stack
  • Contribute ideas that influence technical strategy and innovation
  • Collaborate with a team that encourages experimentation and continuous improvement

Work Location

Philadelphia, PA 19105 (Center City)
Hybrid schedule: 3 days onsite / 2 days remote

Local candidates only – relocation is not available for this role.

About the Company

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InfotechStaffing