Title: Mainframe Developer / Senior Mainframe Engineer Legacy Modernization

Location: Mexico Remote

Engagement: Contract

Experience: 6+ years preferred

Language: English communication required; Spanish preferred

Job Description

Role Overview

We are looking for experienced Mainframe Developers / Senior Mainframe Engineers to support a large-scale legacy modernization initiative. The role requires strong hands‑on IBM Mainframe development experience along with the ability to analyze existing legacy applications, understand business rules and data flows, support modernization/migration activities, and work closely with distributed engineering teams.

Candidates should be comfortable working with mission‑critical applications and handling both batch and online mainframe processing.

Key Responsibilities

- Analyze, maintain, enhance, and modernize existing mainframe applications.
- Develop and support applications using COBOL, JCL, DB2, CICS, and VSAM.
- Analyze legacy code, copybooks, batch jobs, data structures, and business rules.
- Support modernization and migration activities while minimizing impact to existing business operations.
- Create and modify batch programs, online transactions, database components, and interfaces.
- Troubleshoot application, production,



and performance issues and perform root‑cause analysis.
- Work with architects and modernization teams to document existing applications and define target‑state solutions.
- Participate in code reviews, unit testing, integration testing, defect resolution, and production support.
- Prepare technical specifications, application flow documentation, and source‑to‑target mappings.
- Collaborate effectively with offshore/onshore development, QA, architecture, and business teams.

Mandatory Skills Recruiters Should Screen for These First

These should be treated as the core screening criteria:

- COBOL strong hands‑on development experience
- JCL batch processing and job execution
- DB2 SQL, data access, troubleshooting and performance
- CICS online transaction processing
- VSAM file handling and data management
- IBM z/OS / Mainframe environment
- Experience supporting legacy modernization, migration, transformation, or application enhancement projects
- Ability to analyze existing mainframe applications, business logic, copybooks, programs, jobs, and dependencies
- Strong debugging and production‑support experience
- Good English communication skills for working with general teams

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📌 Mainframe Developer / Senior Mainframe Engineer Legacy Modernization (México)
🏢 Connect Tech+Talent
📍 México