Job Description: Senior Mainframe Software Engineer Location: Hybrid, 4 days per week onsite Dearborn MI 12+ Month Contract $55-65/HR Position Overview We are seeking a Senior Mainframe Software Engineer to design, develop, test, maintain, and support enterprise software applications serving critical business functions. This role will be responsible for the full software development lifecycle, including architecture, development, testing, deployment, optimization, and production support. The ideal candidate will have extensive experience in Mainframe development (COBOL, DB2, CICS, JCL, z/OS) while also embracing modern development practices, APIs, Agile methodologies, DevOps principles, and AI-assisted development tools. Key Responsibilities - Partner with business stakeholders and customers to understand requirements, analyze use cases, and deliver user-centric solutions. - Design, develop, test, deploy, and maintain high-quality software applications and services. - Evaluate business and technical requirements to determine the appropriate architecture, technology stack, integration approach, and deployment strategy. - Create and maintain high-level and detailed application architecture designs. - Develop, enhance, and support mainframe applications using COBOL, DB2, CICS, JCL, TSO/ISPF, and z/OS technologies. - Design, develop, and maintain APIs, integrations, and backend services. - Collaborate with Product Owners, Architects, Designers, QA teams, and cross-functional stakeholders throughout the development lifecycle. - Define and implement testing strategies, standards, and best practices, including functional, integration, and performance testing. - Perform root cause analysis, troubleshooting, and production support activities. - Continuously improve application performance, reliability, maintainability, and scalability. - Utilize modern engineering practices such as: - Agile development - Test-Driven Development (TDD) - Continuous Integration/Continuous Delivery (CI/CD) - Version control and code review processes - Support application security practices, including data protection, encryption, and secure coding standards. - Leverage AI-assisted development tools (GitHub Copilot, OpenCode, and other LLM-based assistants) to accelerate development, improve code quality, and enhance productivity. - Evaluate emerging technologies and recommend solutions that improve engineering effectiveness and business outcomes. Required Qualifications - Bachelor's degree in Computer Science, Information Technology, Engineering, or a related field. - 10+ years of IT experience. - 8+ years of software development experience. - Strong proficiency in at least one programming language and practical experience with multiple development technologies. - Extensive experience with: - COBOL - DB2 - CICS - JCL - z/OS - TSO/ISPF - SQL - Batch Processing - REST APIs - GitHub - Experience with software testing, application support, program analysis, performance testing, and root cause analysis. - Strong understanding of Agile software development methodologies. - Experience using AI-assisted development tools and practices, including: - GitHub Copilot - AI-Assisted Development - Prompt Engineering - LLM API Integration - AI Code Review Preferred Qualifications Experience with process improvement initiatives. Familiarity with Google Cloud Platform (GCP). Experience with: BigQuery Data Migration