NET Developer - Financial Systems & Integrations

• Maintain and enhance legacy and custom financial applications
• Analyze and modify application logic with minimal documentation
• Design and develop scalable software solutions and integrations
• Implement API, database, and file-based system integrations
• Improve UI/UX with modern, responsive design practices
• Troubleshoot and resolve complex financial system issues
• Collaborate with technical teams and document solutions

ASSYST is seeking a highly skilled and self-driven Senior Software Developer to support and enhance complex, enterprise-scale financial applications. This role involves working on custom-built systems handling high-volume transactions, including payments, reconciliation, reporting, and multi-system integrations.

The ideal candidate is detail-oriented, capable of working independently, and experienced in solving complex financial and technical challenges., * HTML, CSS, JavaScript (Bootstrap or Tailwind)

• Responsive and mobile-first UI/UX design
• C#, ASP.NET (WebForms, MVC, .NET Core)
• Azure Entra ID / Azure AD B2C
• Microsoft SQL Server
• System integration (API, DB, file-based)
• Microsoft DevOps & system administration (IIS, networking)
• Familiarity with AI-assisted development

Required Experience:

• 7+ years maintaining legacy applications with limited documentation
• 7+ years developing Finance-Tech solutions (payments, billing, reconciliation)
• 5+ years integrating with Tyler Technologies MUNIS or similar ERP systems
• 3+ years recent experience with Paymentus integrations (iframes, redirects, UAT/production)
• 7+ years UI/UX development with responsive design (recent experience required)
• Proven ability to work independently and deliver practical solutions