Mainframe Developer

Stefanini Group • Dearborn, MI

6d • Onsite

About The Position

Stefanini Group is hiring a Mainframe Developer in Dearborn, MI. This role is responsible for designing, developing, testing, maintaining, and supporting critical software applications and products. As an integral part of the Vehicle Order Processing and Control Product team, the developer will be involved in the entire software development lifecycle (SDLC), including business analysis, technical consultation, designing robust backend and integration software architectures, writing code (COBOL, JCL, Java), testing for quality, and deploying system updates. The focus is on developing and maintaining backend mainframe components (DB2, IMS, stored procedures, MQs, REST services) and their integration points with Java-based systems to ensure seamless, end-to-end transaction processing.

Requirements

• 5 to 10 years of hands-on experience in Mainframe development, systems analysis, and production support across all phases of the SDLC.
• Extensive experience with COBOL, DB2, JCL, VSAM, IMS, and REXX in both Batch and online transactional environments.
• Ability to assess the requirements of mainframe applications and services to determine the most suitable technology stack, integration methods (such as DB2 REST services, Message Queues (MQs), and microservices), and deployment strategies.
• Ability to create high-level software architecture designs that outline the overall structure, components, and interfaces of applications, specifically defining how Java-based systems securely and efficiently communicate with DB2 back-end databases.
• Strong experience managing DB2 stored procedures, DB2 REST services, Message Queues (MQs), SQL Server, and Endeavor.
• Ability to visualize, query, and work with both mainframe (DB2) and non-mainframe (SQL Server) data structures.
• Some experience with Java, with a strong focus on how Java applications interface with DB2 databases (e.g., via COBOL stored procedures, MQs, or RESTful services).
• Proven experience working in highly collaborative, Agile software development teams with a strong drive for results.
• Bachelor's Degree

Nice To Haves

• Analytical skills

Responsibilities

• Work on continuously improving performance and optimizing applications, including recommending and executing DB2 database performance tuning actions.
• Implement new development tools (such as Endeavor) to maximize engineering efficiency.
• Adapt programming practices like test-driven development (TDD), continuous integration, and continuous delivery (CI/CD) to a hybrid Mainframe and Java backend ecosystem.
• Support security practices to safeguard critical vehicles, order, and customer data, ensuring proper encryption, secure APIs, and data anonymization across both mainframe (DB2) and non-mainframe (SQL Server) databases.
• Enable user-friendly and interactive interfaces by developing highly performant and reliable backend APIs, data access layers, and communication channels (MQs, stored procedures) that power frontend consumer applications.
• Develop and maintain back-end applications like APIs, microservices, and database layers using server-side languages, COBOL stored procedures, IMS transactions, and SQL Server integration.
• Evaluate and incorporate emerging technologies and capabilities (such as hybrid-cloud integration, DB2 REST services, and modern mainframe tooling) to deliver solutions.
• Monitor and participate in new stack layers often involving industry collaboration.
• Provide off-hours production support as required for the North America Eastern Time Zone.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level