Mainframe Software Engineer (Assembler/C)

Mainframe Software Engineer

Key Responsibilities

• Develop, enhance, and maintain applications on

  IBM z/OS

  using

  Assembler, C, JCL, REXX

  , and related technologies.
• Participate in the full SDLC: requirements analysis, design, coding, testing, and production support.
• Optimize performance, troubleshoot defects, and ensure system reliability.
• Collaborate with cross-functional teams (System Engineers, QA, DevOps, Business Stakeholders).
• Maintain technical documentation, coding standards, and operational procedures.
• Support legacy systems while contributing to modernization efforts.

Required Qualifications

• 5+ years

  of programming experience in:

• Assembler / HLASM

  (on z/OS)

• C

  (on z/OS)
• Comprehensive expertise in IBM subsystems and z/OS internals: cross-memory services, SRB management, Program Call routines, interlanguage communication (Assembler, Java, C, REXX).
• Extensive experience in

  APF-authorized code development

  and secure, high-performance system-level modules.
• Expert-level proficiency in

  HLASM

  and z/OS system macros for program management, storage, synchronization, recovery, and messaging.
• Skilled in subsystem interfaces and exits integrating with JES, SMF, and core components.
• Advanced debugging using

  XDC, IPCS, dump analysis

  for complex system issues.
• Familiarity with Sysplex communication using

  XCF macros

  .
• Experience with Agile/Scrum methodologies for mission-critical software delivery.

Preferred Skills

• Knowledge of

  Zowe, z/OSMF, RESTful APIs

  , modernization/integration projects.
• Strong Java development skills (JZOS, JNI, batch-mode applications).
• Familiarity with

  ICSF, RACF

  , SMP/E packaging, SBOM compliance (CycloneDX/SPDX).

Education

• Bachelor's degree in computer science, software engineering, IT, or equivalent experience.

What We Offer

• Competitive salary and benefits.
• Opportunity to work on mission-critical enterprise systems.
• Professional growth and training on modern mainframe and hybrid cloud technologies.
• Collaborative and inclusive work environment.

About PKWARE

1,200+ customers