SIL Sr Full-Stack Developer

Sonepar

$100K — $130K *
Information Technology
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • Bachelor's degree in Computer Science or related field, or equivalent practical experience.
  • 3-7 years of experience as a full-stack developer in a large enterprise environment.
  • Strong experience in C#, .NET (ASP.NET MVC) for backend development.
  • Experience in creating REST APIs and integration services with JSON and XML.
  • Solid knowledge of Microsoft SQL Server for database design and optimization.
  • Familiarity with front-end technologies: JavaScript, TypeScript, HTML, CSS, and cross-browser development.
  • Experience using Visual Studio IDE with modern development workflows.

Responsibilities

  • Design, build, and maintain backend-oriented web applications with C#, .NET, and ASP.NET MVC.
  • Develop and support RESTful APIs to enable system integration.
  • Own backend components including business logic and data access layers.
  • Contribute to full-stack development for complete solutions.
  • Troubleshoot and optimize applications for better performance and security.
  • Collaborate with product owners and engineers throughout the development lifecycle.
  • Participate in code reviews and discussions for continuous improvement.

Benefits

  • Healthcare plans
  • Dental & vision coverage
  • Paid time off and parental leave
  • 401(k) retirement savings with matching
  • Professional and personal development programs
  • Opportunity to become a shareholder
  • Employer-paid short- and long-term disability
  • Life insurance for spouse and dependents
  • Robust wellness program with gym reimbursement
  • Employee Assistance Program (EAP)
Full Job Description
We are seeking a Full Stack Developer with a Back-End Focus to support the design, development, and enhancement of enterprise web applications. This role emphasizes backend architecture, APIs, data access, and system integrations, while requiring hands-on full-stack capability to support end-to-end solution delivery.

This role is located in Broomfield, Colorado on a hybrid schedule.

Responsibilities
  • Design, build, and maintain backend-centric web applications using C#, .NET, and ASP.NET MVC.
  • Develop and support RESTful APIs and Web Services that enable scalable integration across internal and third-party systems.
  • Own backend components including business logic, data access layers, and integrations supporting enterprise web applications.
  • Contribute to full-stack development by supporting front-end components as needed to deliver complete, end-to-end solutions.
  • Troubleshoot, debug, and optimize applications to ensure reliability, security, and performance.
  • Collaborate with product owners, architects, UX, QA, and other engineers across the full software development lifecycle.
  • Participate in design discussions, code reviews, and continuous improvement initiatives.


Qualifications

Required
  • Bachelor's degree in Computer Science or a related field, or equivalent practical experience.
  • 3-7 years of experience as a full-stack application developer within a large, complex, enterprise environment.
  • Strong hands-on experience designing and developing:
    • C# and .NET (ASP.NET MVC) backend components and services
    • REST APIs and Web APIs
    • Integration services using JSON, XML, and related technologies
  • Solid experience with Microsoft SQL Server, including relational database design, querying, and performance optimization.
  • Proven understanding of Object-Oriented Design and backend architectural patterns.
  • Working knowledge of front-end technologies including:
    • JavaScript
    • TypeScript
    • HTML
    • CSS
    • Cross-Browser Development
  • Experience using Visual Studio IDE and modern development and deployment workflows.


Additional Requirements
  • Strong understanding of full web application architecture, from UI through data access layers, with a backend-first mindset.
  • Ability to balance backend system ownership with full-stack development responsibilities.
  • Excellent problem-solving, collaboration, and communication skills.
  • Authorization to work in the U.S. without current or future visa sponsorship is required.


#LI-CM1

What We Offer You

We offer great family-friendly benefits to full-time associates:
  • Healthcare plans
  • Dental & vision
  • Paid time off
  • Paid parental leave
  • 401(k) retirement savings with company match
  • Professional and personal development programs
  • Opportunity to become a shareholder
  • Employer-paid short- and long-term disability
  • Employer-paid life insurance for spouse and dependents
  • Robust wellness program
  • Gym reimbursement
  • Employee Assistance Program (EAP)

We're proud to be a military-friendly company, and our many employee resource groups (ERGs) help you make connections and feel supported.

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