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zTPF Developer

Lumen Solutions Group Inc

Job Location:

Washington, DC - USA

Monthly Salary: Not provided by the employer

Posted: 22 September 2026 (14 hours ago)

Application Deadline: 20 December 2026

Vacancies: 1 Vacancy

Job Summary

Company Description
Lumen SolutionsGroupInc. is a technology consulting Servicescompany based inFlorida. Weprovidea wide array of experienced business and IT professionals supporting clients from solution design to implementation and specialize in professional IT consulting services IT Staffing Business/IT Strategy Business Process Blueprints Enterprise Architecture and EnterpriseTransformation.

Role:zTPF Developer
Location:Washington DC (Remote)
Job Type:Contract

The IBM z/TPF Developer is responsible for designing developing maintaining and supporting mission-critical z/TPF applications using HLASM/Assembler. This role focuses on complex debugging production issue resolution root-cause analysis and performance optimization across high-volume inventory reservation availability ticketing and transaction-processing systems.
You will work extensively with the IBM z/TPF Toolkit ECB processing TPFDF assembler macros dump analysis and transaction flows while implementing safe production fixes and supporting releases. The role also involves collaborating with technical teams and stakeholders to maintain reliable high-availability z/TPF applications.

Key Responsibilities

Design develop maintain and support complex IBM z/TPF applications written in High-Level Assembler HLASM or ASM.
Troubleshoot and resolve complex production issues involving multiple assembler modules macros utilities services and transaction-processing flows.
Perform detailed root-cause analysis involving inventory availability reservation ticketing and related transaction-processing systems.
Use the IBM z/TPF Toolkit debugger dump analysis and diagnostic utilities to investigate application behavior.
Debug Entry Control Block processing including ECB work areas registers storage management control blocks masks flags and transaction execution flows.
Analyze and maintain TPFDF record structures ordinals file retrieval and update logic chain records and database access paths.
Examine multiple processing paths to identify functional differences within complex assembler-based business logic.
Analyze assembler macros and trace the underlying execution paths created through macro expansion.
Conduct impact assessments and implement safe reliable fixes within mission-critical production environments.
Review code and provide technical guidance to developers and other team members.
Collaborate with architects business analysts developers and stakeholders to translate requirements into effective technical solutions.
Create and maintain technical documentation design specifications debugging findings and root-cause analysis reports.
Support testing deployments production releases and post-implementation validation.

Required Qualifications

Bachelors degree in Computer Science Information Systems Engineering or a related field or equivalent practical experience.
Eight or more years of hands-on IBM z/TPF application-development experience.
Eight or more years of High-Level Assembler HLASM or ASM programming experience.
Advanced experience developing maintaining and supporting enterprise transaction-processing applications in a z/TPF environment.
Expert-level ability to debug and troubleshoot complex assembler applications.
Hands-on experience with the IBM z/TPF Toolkit debugger dump analysis and related diagnostic utilities.
Strong knowledge of ECB processing ECB work areas registers storage management and transaction execution flows.
Strong experience analyzing assembler macros and tracing generated execution paths.
Demonstrated ability to perform root-cause analysis across multiple assembler modules utilities services and processing paths.
Experience resolving complex production issues in high-availability mission-critical environments.
Strong knowledge of inventory reservation availability ticketing transportation airline railroad or comparable transaction-processing applications.
Strong understanding of z/TPF transaction-processing architecture and system internals.
Experience analyzing application performance and implementing production-safe solutions.
Experience with source-control and change-management tools such as Git and Jira.
Experience supporting production deployments releases and post-implementation validation.
Strong analytical troubleshooting communication and collaboration skills.
Ability to independently investigate and resolve issues spanning multiple assembler modules and processing paths.
Experience working in an Agile or Scrum development environment.

Preferred Qualifications

Experience supporting transportation railroad airline logistics reservation inventory availability or ticketing platforms.
Knowledge of z/OS TSO/ISPF JCL and related mainframe-development tools.
Advanced experience with z/TPF dump analysis debugging utilities and performance-analysis tools.
Experience with TPFDF record structures ordinals file addressing and chain-record processing.
Working knowledge of C programming and C/Assembler integration within a z/TPF environment.
Experience analyzing or modernizing large legacy assembler codebases.
Experience designing troubleshooting and optimizing high-volume transaction-processing applications.

Lumen SolutionsGroup Inc is an equal opportunity employer. All qualified applicants will be considered for employment without regard to any legally protected status

Required Experience:

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