C# Software Engineer III (Modern .NET Core)

ConsultNet Technology Services and Solutions; Longmont (CO); Hybrid; USD 83,000 - 96,000; Full time

Job summary

ConsultNet Technology Services and Solutions is seeking a C# Software Engineer III with deep experience in modern .NET Core to join a highly technical engineering team in Longmont, CO. The role emphasizes design, architecture, and delivering large-scale multi-tier applications across desktop and web environments.

The position is a long-term contract in a hybrid setting (Longmont, CO) with onsite presence 3x per week.

Qualifications

• 5+ years of experience with C# and modern .NET Core / .NET.
• Deep understanding of object-oriented programming (OOP).
• Experience with dependency injection and SQL Server.
• Experience with Entity Framework or similar ORM tools.
• Understanding of multi-tier architecture and enterprise-level applications.

Responsibilities

• Design, develop, and maintain applications using C# and modern .NET Core / .NET.
• Contribute to a complex, multi-tier architecture supporting desktop and web apps.
• Apply OO design principles to build scalable, maintainable systems.
• Implement dependency injection and modern architectural patterns.
• Collaborate on system design, architecture decisions, and performance improvements.
• Troubleshoot issues across layers and enhance reliability.

Skills

C#

.NET Core

OOP

Dependency Injection

SQL Server

Entity Framework

Multi-Tier Architecture

Desktop Application Development

MVC

Tools

Visual Studio

Job description

Title: C# Software Engineer III (Modern .NET Core) Location : Longmont, CO (hybrid schedule, 3x/wk onsite)

Target Start Date : ASAP

Long-Term Contract (2-3 years)

Pay Rate : $60.00-$70.00 (DOE)

Our client, a global leader in advanced autonomous and robotic solutions across multiple industries, is seeking a C# Software Engineer III to join a highly technical, architecture-driven engineering team. This group builds and supports large-scale, multi-tier applications (600-800 projects within a single application ecosystem) across both desktop and web environments .

This role is ideal for an engineer with deep experience in C# and modern .NET Core (not limited to ASP.NET/web development) who understands how systems are designed—not just built—and thrives in an environment that values clean architecture and strong engineering fundamentals .

What You’ll Do

• Design, develop, and maintain applications using C# and modern .NET Core / .NET (latest versions)
• Contribute to a complex, multi-tier architecture supporting desktop and web applications
• Apply object-oriented design principles to build scalable, maintainable systems
• Implement and leverage dependency injection and modern architectural patterns
• Work with SQL Server and Entity Framework for data access and persistence
• Collaborate on system design, architecture decisions, and performance improvements
• Troubleshoot issues across application layers and enhance system reliability

What We’re Looking For Required:

• 5 years of experience with C# and modern .NET Core / .NET
• Deep understanding of object-oriented programming (OOP)
• Experience with dependency injection
• Solid experience with SQL Server and application/data interaction
• Experience with Entity Framework or similar ORM tools
• Understanding of multi-tier architecture and its real-world application
• Experience working on complex, enterprise-level applications
• Ability to clearly articulate technical and architectural concepts

Preferred:

• Experience with desktop application development (not just web-based / ASP.NET)
• Familiarity with MVC and modern architectural patterns
• Background in C or experience with real-time systems/devices
• Exposure to large, highly modular application environments

What Sets You Apart

• You understand the "why" behind architectural decisions
• You’ve worked on large, complex systems, not just smaller applications
• You bring depth of knowledge, not just surface-level framework experience
• You’re comfortable discussing design, scalability, and system structure

Why Join

• Work on large-scale, technically challenging systems
• Be part of a team that prioritizes engineering rigor and strong architecture
• Collaborate with experienced engineers and grow your technical depth
• Join a team that is raising the bar and investing in long-term quality

Welcome to ConsultNet and the family of companies, Tekne, SaltClick, TechBridge, and OmniMedia. As a premier national provider of technology talent and solutions, our expertise spans across project services, contract-to-hire, direct placement, and managed services both onshore and nearshore.

Celebrating more than 25 years of partnership with a diverse client base, we’ve crafted rewarding opportunities for our consultants, fostering high-performing teams that deliver impactful results.

Over the last few years thousands of consultants have found their calling with us in roles that have made a meaningful impact on their lives, enhanced their career, challenged them, and propelled them towards achieving their personal and professional goals. At the ConsultNet family of companies, we believe effective communication is crucial in aligning the right job with your unique skills and professional aspirations. To us, it’s all about the personal approach we take and the values we uphold.

Our comprehensive service offerings cover a wide range of technology positions across key markets nationwide. Client more at www.consultnet.com .

We champion equality and inclusivity, proudly supporting an Equal Opportunity Employer policy. We welcome applicants regardless of Race, Color, Religion, Sex, Sexual Orientation, Gender Identity, National Origin, Age, Genetic Information, Disability, Protected Veteran Status, or any other status protected by law.

Welcome to ConsultNet and the family of companies, Tekne, SaltClick, TechBridge, and OmniMedia. As a premier national provider of technology talent and solutions, our expertise spans across project services, contract-to-hire, direct placement, and managed services both onshore and nearshore.

Celebrating more than 25 years of partnership with a diverse client base, we’ve crafted rewarding opportunities for our consultants, fostering high-performing teams that deliver impactful results.

Over the last few years thousands of consultants have found their calling with us in roles that have made a meaningful impact on their lives, enhanced their career, challenged them, and propelled them towards achieving their personal and professional goals. At the ConsultNet family of companies, we believe effective communication is crucial in aligning the right job with your unique skills and professional aspirations. To us, it’s all about the personal approach we take and the values we uphold.

Our comprehensive service offerings cover a wide range of technology positions across key markets nationwide. Client more at www.consultnet.com .

We champion equality and inclusivity, proudly supporting an Equal Opportunity Employer policy. We welcome applicants regardless of Race, Color, Religion, Sex, Sexual Orientation, Gender Identity, National Origin, Age, Genetic Information, Disability, Protected Veteran Status, or any other status protected by law.