Senior .NET / Azure Integration Developer

Senior .NET Azure Integration Developer

Company: Willan Technologies

Client: Pennsylvania Turnpike Commission (PTC)

Engagement: Contract

Location: Remote with mandatory onsite attendance in Middletown, PA — one week per month

Preferred candidates: Harrisburg, PA, and surrounding areas

Build the integrations behind a major tolling technology transformation.

Willan Technologies is seeking a Senior .NET Azure Integration Developer to support the Pennsylvania Turnpike Commission’s Journi project. You will design and deliver high-volume integrations connecting Microsoft Azure, SAP, Dynamics 365 CRM, interactive voice response (IVR) systems, payment platforms, and tolling applications.

This role suits an experienced developer who combines hands-on C#/.NET expertise with a strong understanding of reliable, secure enterprise integrations.

What You’ll Do

• Design, develop, deploy, and support enterprise integration solutions using C#, .NET 8+ or supported .NET LTS versions, and ASP.NET Core Web API.

• Develop secure RESTful APIs, microservices, custom middleware, reusable components, and shared integration frameworks.

• Build Azure Functions using HTTP, Service Bus, timer, and blob triggers.

• Implement messaging solutions with Azure Service Bus, including queues, topics, subscriptions, sessions, and dead-letter queues.

• Connect SAP, Dynamics 365 CRM, IVR systems, payment gateways, backend databases, and external tolling and traffic management systems.

• Implement JSON/XML transformations, payload validation, and data mapping.

• Assess integration approaches for high-volume processing, streamline data flows, and reduce unnecessary data replication.

• Design and optimize IVR integrations to improve customer interactions and operational efficiency.

• Produce technical designs, integration diagrams, test plans, test scripts, and support documentation.

• Follow clean coding practices, SOLID principles, secure coding standards, and Commission policies.

Required Qualifications

• 8+ years of developer or comparable experience, including Azure cloud solutions, IVR systems, and external system integrations, specifically within tolling projects.

• Strong hands-on development experience with C#, .NET, ASP.NET Core, and REST APIs.

• Experience integrating toll collection systems, traffic management systems, or other external platforms within tolling environments.

• Strong understanding of Microsoft Azure government and commercial cloud platforms, including IaaS, PaaS, and SaaS.

• Experience building secure, reliable integrations for enterprise applications.

• Bachelor’s degree in Computer Science, Engineering, or a related field.

Highly Desired

• 10+ years of experience developing complex integrations for high-volume organizations using SAP, Microsoft Dynamics 365 CRM, and Microsoft Azure.

• Previous experience with Pennsylvania Turnpike tolling solutions.

• Hands-on expertise in Azure Functions, Azure Service Bus, microservices, and custom middleware.

• Experience designing, developing, and optimizing IVR systems.

• Knowledge of tolling industry standards, regulatory requirements, and operational practices.

• Master’s degree in a relevant field.

Work Arrangement & Travel

The position is primarily remote, with required onsite meetings in Middletown, PA, one week per month. Candidates must also be available for:

• A full-day onsite orientation and personal equipment pickup.

• Additional onsite work for implementations, stakeholder sessions, or system issues.

• Potential rotating onsite support assignments of one to two weeks during the six months following go-live.

Candidates in Harrisburg and surrounding areas are strongly preferred by Willan Technologies. Candidates elsewhere in the continental United States may be considered if they can meet all onsite requirements.

Travel for orientation, equipment pickup, and in-person interviews is not reimbursed. For resources within a three-hour commuting distance, the rate must include all travel costs. Any other travel reimbursement requires authorization and is subject to applicable guidelines.

Interview Process

• Initial interview via Microsoft Teams, with the camera on throughout.

• Candidates must participate independently, without AI tools, scripts, external prompts, or assistance from others.

• Only the laptop’s built-in camera, screen, speakers, and microphone may be used. External monitors, headphones, earbuds, and other external devices are prohibited.

• Candidates may be asked to show their surroundings and share their entire screen.

• Additional in-person interviews may be required in Middletown, PA.

Before You Apply

Selected candidates must complete required onboarding documentation, Pennsylvania ePATCH and national criminal background checks, and applicable confidentiality and technology-use agreements.

To apply, submit your current résumé highlighting your .NET/Azure integration projects, tolling and IVR experience, current location, and availability for the required onsite schedule.