Senior IBM z/TPF Systems/Software Engineer

job summary:

Randstad is seeking an experienced Senior IBM z/TPF Software Engineer on behalf of a premier client based in Washington, DC. In this role, you will be responsible for designing, maintaining, and supporting mission-critical, high-volume transaction processing applications written in High-Level Assembler (HLASM). Serving as a technical subject matter expert, you will perform deep root-cause analysis, debug complex storage and control block issues, and lead the resolution of production challenges across inventory, reservation, and ticketing workflows. This role offers an exceptional opportunity to collaborate with cross-functional architects and development teams to ensure maximum performance, stability, and production-safe updates for enterprise mainframe systems.

location: Washington, Washington, D.C.

job type: Contract

salary: $50 - 55 per hour

work hours: 9am to 5pm

education: Bachelors

responsibilities:

Application Development & Maintenance: Design, develop, maintain, and support complex IBM z/TPF applications utilizing High-Level Assembler (HLASM/ASM).

Production Debugging & Diagnostics: Analyze, debug, and resolve high-priority production issues using IBM z/TPF Toolkit, debuggers, dump analysis, and diagnostic utilities.

Low-Level System Troubleshooting: Perform deep-dive analysis on Entry Control Block (ECB) processing, registers, storage management, work areas, control blocks, masks, flags, and transaction execution flows.

Database & Record Management: Maintain TPFDF record structures, ordinals, file retrieval/update logic, chain records, and database access paths.

Macro Analysis & Code Tracing: Trace execution flows generated by macro expansion and investigate underlying functional logic across multiple processing paths.

Root-Cause & Impact Analysis: Conduct root-cause investigations for inventory, availability, reservation, and ticketing system issues, providing production-safe code fixes.

Technical Leadership & Collaboration: Perform peer code reviews, mentor development teams, and collaborate with architects and business analysts to translate complex business requirements into technical solutions.

Documentation & Release Support: Create detailed technical documentation, design specs, and debugging reports while supporting production deployments, testing, and post-release validation.

qualifications:

Education: Bachelor's degree in Computer Science, Information Systems, Engineering, or a related field (or equivalent practical experience).

z/TPF & HLASM Experience: 8+ years of hands-on experience developing, maintaining, and troubleshooting IBM z/TPF applications and High-Level Assembler (HLASM/ASM) code.

System Internals & Execution Flows: Deep experience with ECB processing, ECB work areas, registers, storage management, and transaction-processing architecture.

Debugging Expertise: Proven track record utilizing IBM z/TPF Toolkit, debuggers, dump analysis, and diagnostic utilities to resolve complex production incidents.

Domain Knowledge: Experience with high-volume transaction-processing systems (e.g., inventory, reservation, availability, ticketing, transportation, airline, or logistics).

Modern Tools & Methodologies: Proficiency with source control and change management tools (e.g., Git, Jira) and experience working within Agile/Scrum delivery environments.

Problem-Solving Skills: Excellent analytical, troubleshooting, and collaboration skills with the ability to independently investigate and trace multi-module assembler issues.

skills:

assembler code,C programming language,refactoring,peer code reviews,storage management,Database,deep-dive analysis,Git,Information Systems,Computer Science,ticketing system,Jira,JCL,Mainframe,Application Development & Maintenance,debug,Debugging,debuggers,production deployments,source control,transaction processing,TSO/ISPF,z/OS,analytical,Problem-Solving Skills,troubleshooting,Collaboration,architecture,business requirements,transaction execution,change management tools,Diagnostics,File Structures,Impact Analysis,logistics,mentor,performance analysis,collaboration skills,Record Management,investigate,root-cause analysis,inventory,System Troubleshooting,technical subject matter expert,technical documentation,Technical Leadership,testing,Tracing,workflows

Equal Opportunity Employer: Race, Color, Religion, Sex, Sexual Orientation, Gender Identity, National Origin, Age, Genetic Information, Disability, Protected Veteran Status, or any other legally protected group status.

At Randstad Digital, we welcome people of all abilities and want to ensure that our hiring and interview process meets the needs of all applicants. If you require a reasonable accommodation to make your application or interview experience a great one, please contact


Pay offered to a successful candidate will be based on several factors including the candidate's education, work experience, work location, specific job duties, certifications, etc. In addition, Randstad Digital offers a comprehensive benefits package, including: medical, prescription, dental, vision, AD&D, and life insurance offerings, short-term disability, and a 401K plan (all benefits are based on eligibility).

This posting is open for thirty (30) days.