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# Principal Applications & Systems Engineer - .NET, PHP & AI

- **Company:** Black Diamond, Inc.
- **Location:** Mundelein, IL, United States
- **Experience:** Expert
- **Salary:** $160,000 - $185,000
- **Contract:** Permanent contract
- **Skills:** ASP.NET, .NET Framework, PHP (Programming Language), Artificial Intelligence, Apache HTTP Server, Applications Architecture, Systems Engineering, LAMP (Software Bundle), Business Software, Business Systems, C Sharp (Programming Language), Cloud Computing, Databases, Data Security, Relational Databases, Database Queries, Web Development, Revision Control Systems, Hyper-V, Internet Information Services (IIS), Kernel-Based Virtual Machine, PostgreSQL, Linux System Administration, Microsoft SQL Server, MySQL, Nginx, Performance Tuning, OpenAI, Shell Script, Software Engineering, Systems Integration, Virtualization Technology, Web Applications, Web Application Frameworks, .NET Core, Blazor, Git, Infrastructure Automation Frameworks, Ollama, Restful APIs, Docker, Web Api, Vmware
- **Published:** November 7, 2026
- **Apply:** https://www.thejobnetwork.com/job/0b29f130-c3d9-4fe9-8934-f27e07207371/principal-applications-systems-engineer-net-php-ai

## About the Role

* 8+ years of professional, hands-on software development and/or systems engineering experience, including substantial application development experience.
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 * Strong proficiency in C# and .NET Core / ASP.NET Core development.
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 * Practical experience developing, maintaining, or enhancing PHP applications.
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 * Experience designing and developing web applications, REST APIs, and database-driven business systems.
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 * Strong SQL skills and experience with PostgreSQL, MySQL, SQL Server, or comparable relational databases.
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 * Experience with Linux server administration and troubleshooting.
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 * Understanding of web application hosting, networking, security, and production environments.
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 * Experience with Git or comparable source control systems.
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 * Ability to independently design, develop, deploy, and troubleshoot production applications.
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 * Strong analytical skills and a demonstrated ability to solve complex technical problems.
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 * Experience with Blazor Server or other modern .NET web frameworks.
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 * Experience with modern .NET application architecture and legacy application modernization.
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 * Strong PHP and LAMP stack development experience.
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 * Experience with Dapper or other .NET data access technologies.
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 * Experience with PostgreSQL and MySQL database administration and performance tuning.
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 * Experience with KVM, VMware, Hyper-V, or other virtualization platforms.
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 * Familiarity with Nginx, Apache, IIS, Docker, and reverse proxies.
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 * Experience with Linux scripting, infrastructure automation, and monitoring.
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 * Experience integrating third-party APIs, telephony systems, or contact center platforms., * Familiarity with OpenAI, Anthropic, Ollama, or other cloud-based and locally hosted AI technologies.

## Description

Black Diamond Pest Control is seeking an experienced, hands-on Principal Applications & Systems Engineer to develop, maintain, and modernize our internal business applications and supporting technology infrastructure., * Design, develop, maintain, and enhance business-critical applications using C#, .NET Core / ASP.NET Core, and PHP.