Lead Mainframe Engineer

MACHINE LEARNING TECHNOLOGIES LLC; Denver (CO); On-site; USD 120,000 - 170,000; Full time

Job summary

To Be Discussed Later is seeking a Lead Mainframe Engineer in Denver, CO to drive modernization of the Safe Deposit Box Mainframe System of Record. The role involves evaluating AI-assisted approaches, enabling code development, test creation, and documentation while maintaining strong data protection and risk controls.

The candidate will lead end-to-end development across the mainframe stack, coordinating with enterprise systems, architecture, and middleware teams to ensure reliable delivery and

Qualifications

• 5+ years of software engineering experience with IBM z/OS mainframe applications
• 5+ years of hands-on COBOL experience
• 5+ years of hands-on JCL and batch processing
• 3+ years of VSAM datasets and IDCAMS utilities
• 3+ years of CICS and Db2/IMS experience
• 3+ years of integrating mainframe apps with enterprise platforms
• Experience using mainframe source-control, build, debugging, testing
• Familiarity with AI-assisted engineering tools for mainframe modernization

Responsibilities

• Lead mainframe modernization planning and execution
• Analyze and design strategic technical solutions across enterprise systems
• Collaborate with architecture, middleware, and frontend teams
• Ensure security, data protection, and risk controls in AI-assisted outputs
• Coordinate testing, data preparation, and production validation

Skills

IBM z/OS mainframe experience

Agile delivery

AI-assisted tooling familiarity

Production support

Tools

JCL

VSAM

CICS

COBOL

IBM MQ

Kafka

APIs

Managed file-transfer

Job description

Job Description

Job ID: J53558

Job Title: Lead Mainframe Engineer

Location: Denver, CO

Duration: 12 Months + Extension

Domain Exposure: Retail

Work Authorization: US Citizen, Green Card, OPT-EAD, CPT, H-1B, H4-EAD, L2-EAD, GC-EAD

Client: To Be Discussed Later

Employment Type: W-2, 1099, C2C

Client is seeking a Lead Software Engineer to join the Safe Deposit Box Modernization team supporting the Safe Deposit Box Mainframe System of Record Application.

This role will be critical in helping to evaluate, plan, and support our mainframe modernization, including responsibly using approved artificial intelligence (AI) tools to accelerate application discovery, code and dependency analysis, technical documentation, solution design, modernization planning, code development, and test creation.

The engineer will apply appropriate human review, validation, security, data protection, and risk controls to AI-assisted outputs to help preserve business logic, improve delivery efficiency, and reduce implementation risk.

This role will analyze, design, and develop strategic technical solutions and interface with enterprise systems of record, architecture, frontend channels, and middleware servicing applications.

This role also supports resolving issues, testing coded solutions, locating, or creating test data for end-to-end testing with partners, performing production research to resolve reported issues or assist other team members, and validating implemented solutions in production to confirm successful outcomes.

Required Qualifications

• 5+ years of software engineering experience with IBM z/OS mainframe applications, including application development, maintenance, production support, and troubleshooting
• 5+ years of hands-on COBOL experience, including structured and modular programming, copybooks, file processing, debugging, unit testing, and analysis of existing business logic
• 5+ years of hands-on experience developing, maintaining, and troubleshooting JCL, cataloged and in-stream PROCs, job steps, parameters, utilities, restart and recovery procedures, batch schedules, dependencies, and job abends
• 3+ years of hands-on experience with VSAM datasets, including ESDS, KSDS, or RRDS structures; file definitions; IDCAMS utilities; data access; and production issue resolution
• 3+ years of experience with CICS and one or more mainframe data technologies such as Db2 or IMS, including transaction flows, program interfaces, data access, and performance or failure analysis
• 3+ years of experience integrating mainframe applications with enterprise platforms using technologies such as IBM MQ, Kafka, APIs, or managed file-transfer patterns
• Experience using source-control, build, debugging, testing, scheduling, monitoring, and deployment tools within a mainframe development environment
• Experience working across the full software development lifecycle in Agile delivery environments, including requirements analysis, solution design, coding, testing, implementation, production validation, incident management, and technical documentation
• Familiarity with approved AI-assisted engineering tools for mainframe application discovery, COBOL and JCL analysis, dependency mapping, documentation, code development, test creation, business-rule extraction, and migration or modernization planning, with appropriate human validation and adherence to security, data-protection, and risk-management requirements

Equal Opportunity Employer

We are an equal opportunity employer. All aspects of employment including the decision to hire, promote, discipline, or discharge, will be based on merit, competence, performance, and business needs. We do not discriminate on the basis of race, color, religion, marital status, age, national origin, ancestry, physical or mental disability, medical condition, pregnancy, genetic information, gender, sexual orientation, gender identity or expression, national origin, citizenship/ immigration status, veteran status, or any other status protected under federal, state, or local law.