Mainframes Developer

We are looking for a Senior Mainframe Developer with deep, hands-on expertise in COBOL, IMS, and DB2 to support and evolve our core mainframe platform. This role has two parts that carry equal weight: staying hands‑on with the mainframe systems that run the business today, and building enough fluency in AWS, Go, and Python to identify and help shape realistic opportunities for modernization and transformation.

You will be one of the primary people who understands how the current platform actually works, and you will use that understanding to help the organization move it forward.

• Design, develop, maintain, and support COBOL applications on IBM mainframe (z/OS), including both batch andonline (CICS/IMS) programs
• Work hands‑on with IMS (DB/DC) and DB2 for mainframe data access, including IMS segment/database design, DB2schema design, SQL, and performance tuning
• Build and maintain deep functional and technical knowledge of the existing mainframe platform,including business logic embedded in legacy COBOL and JCL code
• Support production mainframe systems: troubleshoot, debug, and resolve incidents across batch and online processing
• Partner with architecture and platform teams to identify and assess realistic opportunities for mainframe modernization and transformation toward cloud‑native architectures (AWS, Go,Python)
• Contribute to modernization initiatives such as code and data migration, re‑platforming, and API‑enablementof legacy mainframe functionality
• Build proof‑of‑concepts and prototypes in Go and/or Python to validate modernization approaches for specific mainframe components
• Document current‑state mainframe architecture, data flows, and business rules to support transformation roadmaps
• Collaborate with architects,data engineers, and Dev Ops teams on hybrid mainframe‑to‑cloud integration patterns
• Follow appropriate change management, testing, and compliance practices given the criticality of the systems involved
• Mentor junior mainframe developers and share modernization and transformation best practices

• Bachelor's degree in Computer Science, Engineering, or a related field, or equivalent practical experience
• 8–12 years of hands‑on mainframe development experience, with deep, current expertise in COBOL
• Strong, hands‑on experience with IMS (DB/DC) for hierarchical database design and transaction processing
• Strong, hands‑on experience with DB2 for z/OS, including SQL, schema design, and performance tuning
• Experience with JCL, VSAM,CICS, and standard mainframe batch/online processing patterns
• Working knowledge of core AWS services (EC2, S3, Lambda, IAM) sufficient to participate credibly in modernization and transformation discussions
• Working proficiency in Goand/or Python, particularly for prototyping modernization approaches and building supporting tooling
• Demonstrated ability to read,reverse‑engineer, and clearly document complex legacy COBOL/JCL business logic
• Strong analytical skills toassess mainframe components for transformation feasibility, risk, and complexity
• Experience with mainframe change management and version control tools (e.g., Endevor, Change Man) and mainframe testing practices
• Strong debugging and production‑support skills for mission‑critical mainframe systems
• Excellent communication skillsto bridge legacy mainframe teams and modern cloud/engineering teams

• Practical use of AI coding/assistant tools (e.g., Claude Code, Git Hub Copilot, Cursor, or similar) to accelerate legacy code comprehension, COBOL/JCL analysis, and documentation of business rules embedded in mainframe code
• Able to use AI tools to help identify and scope mainframe modernization and transformation opportunities, such as summarizing…