Mainframe Application Developer-L3

Job title: Mainframe Application Developer-L3

Location: Richardson, TX 75082 OR Baskin Ridge ,NJ ,Tampa FL - Hybrid

Job Description

Mainframe Application Developer (L3 Support – Tech lead) Need a highly experienced mainframe developer or solution architect with experience leading a team providing Tier 3 support that includes code enhancements, bug fixes, remediation of vulnerabilities, and platform upgrades (z/OS, DB2, IMS, SAS, and Endevor-related tasks). The developer should be able to support Tier 1 and Tier 2 teams who manage daily operations and ensure the system remains stable, available, and functioning 24/7.

This role supports multiple integrated network planning and work administration systems used to plan, provision, dispatch, inventory, and maintain telecom networks. Knowledge of PL/I or Assembler, JCL, REXX, SAS, DB2, IMS, and mainframe compilation flows is required.

Must Have :
Mainframe - PL/1, C370,  Assembler, IMS, DB2, JCL ,DB Developer

Responsibilities

Provide Tier 3 Support for all mainframe OSS applications, including:

• Provide code fixes across PL/I, Assembler, COBOL, SAS, REXX, CLIST, and JCL modules

• Prepare enhancements and minor functional changes

• Identify and remediate vulnerabilities in mainframe modules or JCL flows

• Perform analysis of production issues impacting dispatch, inventory, or planning systems

• Thoroughly test all software changes using approved test suites

• Successfully build and deploy all software changes through Endevor across multiple regions

• Debug and resolve abends using Abend-Aid, Fault Analyzer, or system dumps

• Support DB2 and IMS precompile, bind, and ACBGEN flows as required for code changes

Assist the Tier 2 Support team as needed including:

• Analysing and responding to end-user or Tier 1/Tier 2 developer questions and tickets

• Administering user access to specific batch flows or applications (as necessary)

• Providing routine system and job stream maintenance

• Maintaining system interfaces between different subsystems

• Ensuring that nightly and weekly cycles complete successfully

• Remediating system overload issues, long-running jobs, or SQL degradation

Requirements

• Minimum 10-15 years of hands-on experience supporting applications on IBM z/OS and leading a team of developers

• Minimum 5–7 years of experience in PL/I or COBOL development

• Strong experience with JCL, PROCs, REXX, CLIST, ISPF, and SDSF

• Solid understanding of DB2 static SQL, precompile, bind, package/plan management

• Experience with IMS (DB + DC), including PSB/DBD/ACB generation flows

• Prior experience with Endevor or similar mainframe source/version management tools

• Ability to analyze load modules, compare source-to-load behavior, and reverse-engineer logic when source is unavailable