Lead Mainframe Engineer - Modernization & AI-Driven Delivery

Ethereum Technologies; Denver (CO); On-site; USD 180,000 - 210,000; Full time

Job summary

Ethereum Technologies in Denver, CO seeks a Lead Software Engineer to join the Safe Deposit Box Modernization team, focusing on the Mainframe System of Record. You will analyze, design, and deliver strategic mainframe solutions while responsibly applying AI-assisted tooling with human validation to protect business logic and security.

You will collaborate across enterprise systems, middleware, and frontend channels, drive modernization planning, and contribute to testing, production validation,

Qualifications

• 5+ years of software engineering experience with IBM z/OS mainframe applications.
• 5+ years of hands-on COBOL experience, including structured and modular programming, copybooks, and file processing.
• 5+ years with JCL, including PROCs, utilities, restart and recovery procedures, batch schedules, dependencies, and job abends.
• 3+ years with VSAM datasets (ESDS, KSDS, or RRDS) including data access and IDCAMS utilities.
• 3+ years with CICS and Db2/IMS including transaction flows and data access.
• 3+ years integrating mainframe apps with MQ, Kafka, APIs, or managed file-transfer patterns.
• Experience with source-control, build, debugging, testing, scheduling, monitoring, and deployment tools in a mainframe development environment.
• Experience across the full SDLC in Agile delivery environments.
• Familiarity with AI-assisted engineering tools for mainframe modernization with proper validation and security.

Responsibilities

• Analyze, design, and develop strategic technical solutions interfacing with enterprise systems and middleware.
• Support mainframe modernization planning, code development, and testing activities.
• Assist testing, debugging, and validation in production environments.
• Locate or create test data for end-to-end testing with partners.
• Validate AI-assisted outputs with human review to protect business logic and security.

Skills

Mainframe development

COBOL

JCL & PROCs

VSAM data access

CICS + Db2/IMS

APIs integration

Agile delivery

Tools

IBM MQ

Kafka

APIs

Job description

Ethereum Technologies in Denver, CO seeks a Lead Software Engineer to join the Safe Deposit Box Modernization team, focusing on the Mainframe System of Record. You will analyze, design, and deliver strategic mainframe solutions while responsibly applying AI-assisted tooling with human validation to protect business logic and security.

You will collaborate across enterprise systems, middleware, and frontend channels, drive modernization planning, and contribute to testing, production validation,