Freelance Desktop Application Developer Jobs in Milan, MI

Company Overview

At Opus IVS, our mission is to drive advancement in the automotive industry by assisting customers with complex vehicle repairs. Guided by our core values of Customer Focus, Innovation, Collaboration & Teamwork, and a Results-Driven approach, we continually strive to develop advanced technology that empowers us to fulfill our mission.

Opus IVS technology & products has been a leader in the industry since the late 90’s. Opus IVS offers modern collision shops an integrated platform of leading diagnostics and calibration solutions, anchored by expert technicians and cutting edge, patented technology.

Position Summary

The Software Developer in Test is responsible for owning quality across multiple interconnected C# platforms, ensuring software is reliable, testable, and regression-safe at every layer of the stack. This role operates within an established testing pyramid spanning unit, integration, and regression coverage across a server-side service layer and a thick-client installer-distributed application, while driving maturity in both as the platform evolves. The ideal candidate brings hands-on experience in .NET/C# environments and a systematic approach to test architecture, enabling them to contribute meaningfully to both test strategy and day-to-day implementation.

Responsibilities

• Write and maintain NUnit unit and integration tests for C# service and application layers — covering backend service domains (Auth, Device, Session) and desktop application components (configuration, application lifecycle, authentication adapters)
• Demonstrate working knowledge of the full development stack, including WPF, MVVM, DI, WCF/SOAP and REST/WebAPI
• Test WCF/SOAP service contracts and REST/WebAPI endpoints for correctness and schema compliance
• Validate desktop application behaviors, executable resolution, launch configuration, and environment-specific config correctness across Dev, QA, and Production
• Validate SignalR real-time messaging behavior
• Build and execute integration tests against partner API surfaces (NetSuite and others)
• Author and maintain automated tests within Azure Pipelines, write pipeline YAML steps, monitor VSTest results, investigate build failures, and maintain test discovery patterns
• Test across multi-environment build configurations and verify config-transform and accuracy
• Collaborate with developers on service-layer and application-layer mocking strategies using MOQ and identify gaps in unit test coverage
• Triage production defects and reproduce them in isolated integration test scenarios
• Write and maintain testing SOPs, document test plans, test case procedures, environment setup guides, and regression runbooks for use across the team

Skills & Abilities

• Customer Focus: Ability to understand and respond to the needs of customers with professionalism and care.?
• Innovation: Ability to generate and apply creative ideas that improve work processes or add value.?
• Collaboration & Teamwork: Ability to build cooperative relationships and contribute to group success.?
• Results Driven: Ability to?maintain?a strong focus on achieving goals and delivering impactful results.?
• Technical Aptitude: Ability to understand and use specific tools, systems, and technologies relevant to the role.?
• Communication: Ability to convey information clearly and effectively, both verbally and in writing.?
• Organization: Ability to structure tasks, processes, and resources efficiently to?maintain?order and flow.?
• Detail-Oriented: Ability to focus on details, ensuring accuracy and precision in work tasks.?

Qualifications

• Bachelor’s degree in Computer Science, Software Engineering, Information Technology, or a related field, and a minimum of five (5) years of QA or SDET experience on .NET applications
• Proficiency writing tests in C# with NUnit (or MSTest/xUnit)
• Experience testing ASP.NET web applications or WCF/SOAP services request/response validation, fault conditions, contract coverage
• Familiarity with MOQ or similar mocking frameworks
• Comfort working with relational databases (SQL Server or SQLite) writing queries to verify data state post-integration
• Experience authoring and maintaining tests in Azure Pipelines, including YAML pipeline configuration and VSTest integration
• Ability to write clear testing SOPs, test plans, and runbooks for engineering and cross-functional audiences
• Strong understanding of the test pyramid and when to unit test vs. integrate vs. regress
• Experience with project management and ticketing tools (TFS, JIRA, Confluence).

WHAT WE OFFER:

• Competitive Pay: We know your value and we’re not afraid to pay for it. We offer a competitive total compensation plan including salary, bonuses, and a match contribution to your 401k.
• Time Off: Besides our competitive paid time off package, employees receive paid holidays and nine floating holidays annually.
• Benefits: We offer a comprehensive benefits package, including all the necessities such as medical, dental, and vision as well as tuition reimbursement.
• Opportunity: to be a part of a fast-growing company working to make the world safer!

We are an equal opportunity employer. All applicants will be considered for employment without attention to race, color, religion, sex, sexual orientation, gender identity, national origin, veteran, disability status or any other characteristic protected by state, federal, or local law.

PHYSICAL DEMANDS

The physical demands described here are representative of those that must be met by an employee to successfully perform the essential functions of this job. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions. While performing the duties of the job, the employee is regularly required to use hands to finger, handle, or feel objects, tools or controls; reach with hands and arms; talk or hear. The employee frequently is required to stand, walk and sit. The employee is occasionally required to stoop, kneel, crouch or crawl. Specific vision abilities required by this job include close vision, color vision, peripheral vision, depth perception and the ability to adjust focus.

We are an equal opportunity employer. All applicants will be considered for employment without attention to race, color, religion, sex, sexual orientation, gender identity, national origin, veteran, disability status or any other characteristic protected by state, federal, or local law.