Application Integration Developer Jobs in Dearborn, MI

2051 Senior .NET Developer, Integration & Quality Engineer

We are seeking a Senior .NET Application Integration & Quality Engineer with strong hands-on .NET and Microsoft SQL Server expertise who can serve as the technical bridge between Business Analysts, Software Developers, Quality Assurance, and IT Operations.

The ideal candidate is an experienced .NET engineer who enjoys understanding how complex applications work end-to-end: analyzing requirements, reviewing code and database logic, debugging difficult problems, validating integrations, identifying gaps before they reach production, and ensuring that delivered solutions actually meet the business requirement.

This individual must be comfortable moving between business processes, application code, SQL Server, APIs and web services, integrations, testing, scheduled processes, file interfaces, and production troubleshooting.

The role will work closely with Business Analysts to add deeper technical analysis to requirements and with Developers to ensure solutions are technically sound, testable, integrated correctly, maintainable, and production-ready.

•       Develop, maintain, troubleshoot, and support enterprise applications built on .NET technologies, including both modern and legacy .NET applications.

•       Partner with Business Analysts to translate business requirements into technically complete, testable requirements.

•       Define technical acceptance criteria, data-validation requirements, integration mappings, exception-handling scenarios, and expected downstream results before development begins.

•       Identify missing requirements, technical dependencies, edge cases, integration impacts, security considerations, and potential failure scenarios before development begins.

•       Review proposed solutions and technical designs for completeness, integration impact, maintainability, supportability, and testability.

•       Perform hands-on debugging and root-cause analysis across application code, databases, web services, APIs, integrations, scheduled jobs, file transfers, and infrastructure dependencies.

•       Design and execute end-to-end testing that covers the complete business process rather than only individual application functions.

•       Perform functional, integration, regression, negative, and data-validation testing.

•       Validate that application changes correctly interact with upstream and downstream systems, including external customers, vendors, partner systems, APIs, data feeds, and scheduled processes.

•       Use SQL Server extensively for investigation and validation, including querying data, analyzing stored procedures, tracing application behavior, validating data changes, and troubleshooting database-related issues.

•       Test and troubleshoot REST and SOAP APIs, web services, secure file interfaces, scheduled processes, batch jobs, and other system integrations.

•       Reproduce production issues and trace problems through the complete technology stack to determine the actual root cause.

•       Work directly with Developers during troubleshooting rather than simply documenting defects and handing them off.

•       Validate defect corrections and application releases and help determine whether solutions are ready for production.

•       Perform pre-deployment validation, confirm deployment dependencies and rollback requirements, conduct post-deployment verification, and document evidence supporting production-readiness decisions.

•       Assist with production support and complex application incidents requiring deeper technical investigation.

•       Help improve development and QA practices, test coverage, technical documentation, operational supportability, and release quality.

Candidates should have strong hands-on experience with:

•       .NET and .NET Framework

•       C# within the .NET ecosystem

•       ASP.NET and enterprise web application development

•       Microsoft SQL Server

•       Advanced SQL querying

•       Stored procedures and database troubleshooting

•       Application debugging and root-cause analysis

•       REST APIs and/or SOAP web services

•       System-to-system integrations

•       Integration and end-to-end testing

•       IIS-hosted applications

•       Source control and modern development practices

•       Enterprise application support and production troubleshooting

We are specifically interested in candidates who bring a developer-level technical understanding to application quality. Experience should include several of the following:

•       Creating end-to-end test scenarios from business requirements and technical acceptance criteria

•       Integration testing

•       Regression testing and impact analysis

•       Functional and negative testing

•       Database and data validation using SQL

•       API and web-service testing

•       Troubleshooting failed tests at the code and database level

•       Defect reproduction and root-cause analysis

•       Identifying edge cases, exception paths, and failure con