C# Software Developer

C# Software Developer (Desktop Applications)

No flexibility on rate range listed ($90k and under) and no corp-to-corp offerings

Overview

We’re partnering with a well-established, product-driven software company to hire a C# Software Developer to help evolve a proprietary ERP platform used by customers across industrial and healthcare industries.

This is a backend-heavy, full-stack engineering role where you’ll work on a mission-critical system, contributing to both new feature development and modernization initiatives. If you enjoy solving complex problems and working on systems that have real business impact, this is a strong opportunity to grow your career.

What You’ll Do

• Design, build, and maintain enterprise-level applications with a focus on performance, scalability, and maintainability
• Develop new features and enhancements within a core ERP platform
• Contribute to modernization efforts, refactoring legacy components into modern .NET frameworks
• Work across the full SDLC: requirements → development → testing → deployment
• Collaborate with product owners and engineering teams to deliver business-driven solutions
• Write clean, maintainable, and well-structured code following best practices
• Troubleshoot and resolve complex technical challenges (performance, concurrency, system behavior)
• Support bug fixes, system optimization, and ongoing improvements
• Assist with occasional escalated production issues and participate in an on-call rotation

Tech Stack

• Languages/Frameworks: C#, .NET
• Database: SQL Server
• UI: WPF (desktop-based applications)
• Architecture: N-tier, distributed/client-server systems
• ORM: Entity Framework (or similar)
• Concepts: Multi-threading, concurrency, performance optimization
• Cloud: Azure

Note: This is not a front-end/JavaScript-heavy role. It is primarily backend-focused.

Required Qualifications

• 3+ years of professional software development experience (ideal range: 3–5 years)
• Strong hands-on experience with C# and .NET (object-oriented programming)
• Solid understanding of SQL Server and relational database design
• Experience building or supporting desktop applications (WPF preferred)
• Familiarity with APIs, services, and distributed systems
• Understanding of data structures and system performance considerations
• Exposure to multi-threading and concurrency concepts
• Familiarity with design patterns such as MVVM or MVC
• Comfortable working across both legacy systems and modern environments

Nice to Have

• Experience with application modernization or system rewrites
• Experience working with Azure or cloud-based deployments
• Familiarity with AI-assisted development tools (e.g., Copilot)

What We’re Looking For

• Strong problem-solving mindset with a structured, logical approach
• Ability to work on complex, business-critical systems
• Collaborative team player who contributes ideas, not just execution
• Interest in long-term growth within a stable product environment
• Consistent work history and ownership mindset

About the Product

You’ll be working on a comprehensive ERP platform that supports:

• Inventory and asset management
• Billing, finance, and compliance workflows
• Order processing and logistics
• Customer and operational data management

This platform is core to customers’ day-to-day operations, making reliability, scalability, and performance essential.

Why This Opportunity Stands Out

• Join a stable, product-based company with a long-standing market presence
• Work on a core platform that directly impacts customers’ businesses
• Gain exposure to ERP systems and complex, domain-driven design
• Be part of a modernization journey transitioning legacy systems to current .NET technologies
• Clear career path with growth opportunities.
• Collaborative, low-turnover engineering team with strong mentorship support

This is a Contract to Hire position based out of Billings, MT.

The pay range for this position is $36.06 - $43.27/hr.

Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following: • Medical, dental & vision • Critical Illness, Accident, and Hospital • 401(k) Retirement Plan – Pre-tax and Roth post-tax contributions available • Life Insurance (Voluntary Life & AD&D for the employee and dependents) • Short and long-term disability • Health Spending Account (HSA) • Transportation benefits • Employee Assistance Program • Time Off/Leave (PTO, Vacation or Sick Leave)

This is a fully remote position.

This position is anticipated to close on Jul 24, 2026.

About TEKsystems

We're partners in transformation. We help clients activate ideas and solutions to take advantage of a new world of opportunity. We are a team of 80,000 strong, working with over 6,000 clients, including 80% of the Fortune 500, across North America, Europe and Asia. As an industry leader in Full-Stack Technology Services, Talent Services, and real-world application, we work with progressive leaders to drive change. That's the power of true partnership. TEKsystems is an Allegis Group company.

The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

About TEKsystems and TEKsystems Global Services

We’re a leading provider of business and technology services. We accelerate business transformation for our customers. Our expertise in strategy, design, execution and operations unlocks business value through a range of solutions. We’re a team of 80,000 strong, working with over 6,000 customers, including 80% of the Fortune 500 across North America, Europe and Asia, who partner with us for our scale, full-stack capabilities and speed. We’re strategic thinkers, hands-on collaborators, helping customers capitalize on change and master the momentum of technology. We’re building tomorrow by delivering business outcomes and making positive impacts in our global communities. TEKsystems and TEKsystems Global Services are Allegis Group companies. Learn more at TEKsystems.com.

The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

San Francisco Fair Chance Ordinance: Pursuant to the San Francisco Fair Chance Ordinance, for all positions located in the city and county of San Francisco, we will consider for employment qualified applicants with arrest and conviction records.

Massachusetts Lie Detector: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Use of Artificial Intelligence (AI): We may use Artificial Intelligence (AI) to support parts of our hiring process, including sourcing, screening, and evaluating candidates. AI helps assess applications and qualifications, but final decisions are made by our hiring team. By applying, you acknowledge and agree that your application may be reviewed using AI tools.