.NET Developer and Application Support

Xylo Technologies, Inc.

Madison, WI • 18m ago • On-site

Senior

On-site

60 - 65 USD/yr

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Quick Facts

  • Interview process: 1–2 rounds via Microsoft Teams
  • Duration: through 6/30/2027, with possible extension
  • Work arrangement: onsite, hybrid, or remote (Wisconsin residency required or relocation to Wisconsin before start)

Description

You will provide day-to-day maintenance and application support for business requests for .NET web applications. The role requires full-stack development to manage integrations, build and maintain web apps and web APIs, and resolve issues through debugging and investigation. You will also implement security controls throughout the software development lifecycle and support security vulnerability remediation and compliance.

Responsibilities

  • Design, develop, and implement web-based applications using .NET technologies to meet business requirements
  • Perform front-end and back-end development of web applications and web APIs (web services)
  • Use ASP.NET, MVC, and .NET Core along with languages such as C# and JavaScript/TypeScript
  • Develop, code, test, and document changes using approved lifecycle methodologies
  • Debug, research, and resolve technical issues
  • Manage integrations and application support requests
  • Implement or use security controls in the software development lifecycle, including GitHub Advanced Security
  • Support security initiatives, participate in vulnerability remediation, and assist with cybersecurity incident escalation
  • Ensure regulatory compliance; follow secure software development frameworks (NIST 800-218 SSDF, ISO 27034)

Requirements

  • 5–8+ years supporting and developing web-based applications using .NET (ASP.NET, MVC, .NET Core)
  • 5–8+ years using C# (and related technologies) plus scripting/front-end languages such as JavaScript/TypeScript and Bootstrap
  • 5–8+ years performing both front-end and back-end development for web applications and web APIs
  • 5–8+ years with ASP.NET and SSRS reporting
  • 5–8+ years with SQL Server and stored procedures
  • Bachelor’s or associate degree in a related specialty, or 5–8+ years of equivalent experience
  • Strong communication skills and sound judgment
  • Experience applying secure software development frameworks (NIST 800-218 SSDF, ISO 27034)
  • Experience enforcing DevSecOps/security standards via secure development practices, vulnerability remediation, automated testing, performance monitoring, and compliance with organizational security frameworks

Benefits

  • Occasional weekend or evening work (potentially up to twice per month); not an on-call role
  • Onsite, hybrid, or remote options available (with Wisconsin residency/relocation requirement)
  • Contract length through 6/30/2027 with potential extension

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