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As400 Testing Jobs (NOW HIRING)

DMS Pharmaceutical Group, Inc.

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Programmer AS400

Park Ridge, IL · On-site

Programming/Testing * Implementation * Support and maintain existing software applications including troubleshooting software "bugs' and applying software patches, fixes, and upgrades * Train users ...

DMS Pharmaceutical Group, Inc.

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Programmer AS400

Park Ridge, IL · On-site

Programming/Testing * Implementation * Support and maintain existing software applications including troubleshooting software "bugs' and applying software patches, fixes, and upgrades * Train users ...

Tata Consultancy Services

Mainframe Developer

Plano, TX · On-site

$47.25 - $60.75/hr

Tata Consultancy Services is seeking a skilled Mainframe and AS400 Developer to design, develop ... testing, and production support for existing systems. • Work with batch jobs, file processing ...

SMART TECH SKILLS LLC

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WMS Configurator

Kearny, NJ · On-site

Experience with integrating WMS platforms with ERP networks, EDI systems, and legacy AS400 architectures. * Experience in executing System Integration Testing (SIT) and User Acceptance Testing (UAT)

SMART TECH SKILLS LLC

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WMS Configurator

Kearny, NJ · On-site

Experience with integrating WMS platforms with ERP networks, EDI systems, and legacy AS400 architectures. * Experience in executing System Integration Testing (SIT) and User Acceptance Testing (UAT)

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As400 Testing information

What are some typical responsibilities and challenges associated with an AS400 Testing position?

AS400 Testing professionals are responsible for designing and executing test cases, validating data integrity, and ensuring that business applications on the AS/400 platform run as intended. A common challenge in this role is working with complex legacy code and systems that may lack thorough documentation, which requires testers to be resourceful and detail-oriented. Testers also collaborate closely with developers, business analysts, and end-users to understand requirements, troubleshoot issues, and verify fixes. The work environment often involves both independent analysis and teamwork, and there's ample opportunity to develop expertise in legacy modernization projects or transition into test lead or quality assurance roles.

What is an AS400 Testing job?

An AS400 Testing job involves evaluating applications running on the IBM AS400 (now IBM i) platform to ensure functionality, performance, and security. Testers work with RPG, COBOL, CL, and DB2-based applications, executing test cases, identifying bugs, and validating system outputs. They use manual and automated testing techniques, including unit testing, system testing, and regression testing. The role requires knowledge of AS400 commands, database structures, and business logic implementation.

What are the key skills and qualifications needed to thrive in the As400 Testing position, and why are they important?

To thrive in AS400 Testing, you need a solid understanding of IBM AS/400 (iSeries) environments, RPG/COBOL programming languages, and knowledge of software testing methodologies. Familiarity with tools such as IBM Rational, Selenium, or other test automation frameworks, along with ISTQB certification, is often beneficial. Strong analytical thinking, problem-solving abilities, and clear communication skills help testers collaborate effectively and report findings. These competencies ensure the delivery of robust, high-quality business applications on legacy systems, minimizing risks and defects.

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As400 Testing jobs near you
Infographic showing various As400 Testing job openings in the United States as of June 2026, with employment types broken down into 100% As Needed. Highlights an 96% Physical, 2% Hybrid, and 2% Remote job distribution.
AS400 / IBM i Infrastructure Analyst

AS400 / IBM i Infrastructure Analyst

Expert Technology Services

Chandler, AZ • On-site

Contractor

Posted 10 days ago

Job description

Please Note: As of July 22, 2021, our team will require that all candidate submissions include a LinkedIn profile. Please do not submit any candidates that do not have a LinkedIn.

We are seeking an experienced AS400 / IBM i Infrastructure Analyst to support and manage enterprise IBM i (AS/400) environments. This role focuses on system administration, platform stability, performance optimization, and security for mission-critical IBM i infrastructure. The ideal candidate will have strong hands-on experience managing IBM i systems and ensuring high availability across production environments.

What You'll Do:

  • Administer, monitor, and support IBM i (AS/400) environments across production, development, and test systems Perform system-level tasks including: OS upgrades and patching (PTFs) System configuration and environment setup
  • Release management and maintenance Manage and maintain: Subsystems and job queues User profiles, authorization lists, and security settings Libraries, objects, and system resources Monitor and optimize system performance, including CPU, memory, and disk utilization
  • Perform capacity planning and performance tuning Support high availability (HA) and disaster recovery (DR) solutions such as PowerHA, MIMIX, or iCluster Execute and validate backup and recovery procedures, including restore testing Troubleshoot and resolve system-level issues, incidents, and performance bottlenecks
  • Support change management processes, including infrastructure updates and patching Work with application, database, and operations teams to ensure system reliability Maintain system documentation, operational procedures, and runbooks

Required Skills : 5 years of experience working with IBM i (AS/400) environments Strong hands-on experience with: IBM i system administration and infrastructure support OS upgrades, PTF management, and system maintenance Job management, subsystems, and system monitoring Experience managing: User security (profiles, permissions, authorization lists) System performance and resource utilization Experience supporting production environments with high availability requirements Strong troubleshooting and problem-solving skills Preferred Qualifications Experience with HA/DR solutions (PowerHA, MIMIX, iCluster, or similar) Familiarity with compliance and audit requirements (SOX, PCI, etc.) Experience with automation or scripting (CL, Shell, or equivalent) Exposure to monitoring and reporting tools Experience working in large-scale enterprise environments Familiarity with integration between IBM i and other enterprise systems What Makes This Role a Great Fit You enjoy working at the system and infrastructure level You are comfortable owning platform stability, performance, and uptime You thrive in environments where reliability and precision are critical You enjoy troubleshooting and improving complex systems

Basic Qualification :

Additional Skills :

Background Check : No

Drug Screen : No


Rank :A3
Requested Date :2026-06-24