Mainframe Developer / Senior Mainframe Engineer Legacy Modernization

Connect Tech+Talent; México; Remote; MXN 900,000 - 1,400,000; Full time

Job summary

Connect Tech+Talent is seeking an experienced Mainframe Developer/Senior Mainframe Engineer for a large-scale legacy modernization initiative in a remote Mexico setting. The role emphasizes hands-on IBM Mainframe development, analysis of legacy applications, and collaboration with distributed teams.

The ideal candidate will have 6+ years of experience, strong COBOL/JCL/DB2/CICS/VSAM skills, and proven ability to work across batch and online processing.

Qualifications

• 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 or migration projects.
• Strong English communication for global teams.

Responsibilities

• Analyze, maintain, enhance, and modernize existing mainframe applications.
• Develop and support COBOL, JCL, DB2, CICS, and VSAM based solutions.
• Analyze legacy code, copybooks, batch jobs, data structures, and business rules.
• Support modernization and migration activities with minimal business impact.
• Create and modify batch programs, online transactions, databases, and interfaces.
• Troubleshoot production, application, and performance issues; perform root-cause analysis.
• Collaborate with architects and modernization teams to document and define target-state solutions.
• Participate in code reviews, testing, defect resolution, and production support.

Skills

COBOL

JCL

DB2 SQL

CICS

VSAM

IBM z/OS

Legacy modernization

English communication

Job description

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 global teams