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As400 Testing Jobs (NOW HIRING)

CirrusLabs

Senior Software Engineer, AS 400

Atlanta, GA · On-site

$117K - $155K/yr

Required : • Develops programs in an IBM AS400 environment using RPG and CL programming. • Ensures that programs can be integrated into different application systems. • Coordinates testing and ...

Northern Base

Technical Service Owner

Portland, OR · On-site

NET Core, AS400/IBM i, REST APIs, Salesforce integration, IBM MQ, API security, API Gateway, ETL, and API testing , combined with strong stakeholder management, Agile delivery, project/product ...

Urpantech inc

RPG Developer (As400)

Neenah, WI · On-site

... system testing • Integration or interface Development • Collaborate with other members of the department Major System Support: • Friedman ERP • Varsity transportation • TL Ashford • ...

Urpantech inc

RPG Developer (As400)

Neenah, WI

... testing Integration or interface Development Collaborate with other members of the department Major System Support: Friedman ERP Varsity transportation TL Ashford Gentran EDI Databases - DB2, SQL ...

Sonsoft Inc

Oracle JDE Developer

Sunnyvale, CA

Al least 4 years of experience of testing with AS400 functional applications. Development experience in AS400 JDE world will be an added advantage. At least 4 years of experience or more in testing ...

Sonsoft Inc

Oracle JDE

Parsippany Troy Hills, NJ

Al least 4 years of experience of testing with AS400 functional applications. * Development experience in AS400 JDE world will be an added advantage. * At least 4 years of experience or more in ...

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As400 Testing information

What is an AS400 Testing?

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 typical responsibilities and challenges of AS400 Testing?

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 are the key skills and qualifications needed for AS400 Testing, 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 August 2026, with employment types broken down into 1% As Needed, 85% Full Time, 10% Part Time, 3% Contract, and 1% Nights. Highlights an 88% Physical, 2% Hybrid, and 10% Remote job distribution.

Information Technology_USA - USA_Developer

Real Soft, Inc.

Jacksonville, FL • On-site

$45.50 - $58.25/hr

Contractor

Re-posted 5 days ago

Job description

**Please strictly adhere to the following resume naming convention:
ALL CAPS, NO SPACES B/T UNDERSCORES
PTN_US_GBAMSREQID_CandidateBeelineID
i.e. PTN_US_9999999_SKIPJOHNSON0413
MSP Owner: Andres Villegas
Location: 6565 Headquarters Drive , Plano , Texas 75024. 100% onsite
Duration: 6 months
skill id: 10817213
Role Descriptions: We are seeking a skilled Mainframe and AS400 Developer to design| develop| maintain| and support enterprise applications running on mainframe and IBM AS400/iSeries platforms. The ideal candidate will have strong experience in COBOL| JCL| DB2| CL| RPG| and related legacy technologies| along with the ability to troubleshoot production issues and support business-critical systems.Key ResponsibilitiesDevelop| enhance| and maintain applications on mainframe and AS400 (preferred) environments.Write and support programs using COBOL| JCL| DB2| CL| RPG| and related tools.Analyze business requirements and translate them into technical solutions.Perform debugging| testing| and production support for existing systems.Work with batch jobs| file processing| and data integration processes.Collaborate with business analysts| testers| and infrastructure teams.Support system upgrades| performance tuning| and incident resolution.Document technical designs| code changes| and support procedures.Required Skills and ExperienceStrong hands-on experience with mainframe technologies.Proficiency in COBOL| JCL| DB2| and VSAM.Experience with IBM AS400/iSeries technologies preferred.Knowledge of batch processing| job scheduling| and file transfer processes.Strong troubleshooting and problem-solving skills.Ability to work in production support and development environments.Good communication and teamwork skills.
Essential Skills: We are seeking a skilled Mainframe and AS400 Developer to design| develop| maintain| and support enterprise applications running on mainframe and IBM AS400/iSeries platforms. The ideal candidate will have strong experience in COBOL| JCL| DB2| CL| RPG| and related legacy technologies| along with the ability to troubleshoot production issues and support business-critical systems.Key ResponsibilitiesDevelop| enhance| and maintain applications on mainframe and AS400 (preferred) environments.Write and support programs using COBOL| JCL| DB2| CL| RPG| and related tools.Analyze business requirements and translate them into technical solutions.Perform debugging| testing| and production support for existing systems.Work with batch jobs| file processing| and data integration processes.Collaborate with business analysts| testers| and infrastructure teams.Support system upgrades| performance tuning| and incident resolution.Document technical designs| code changes| and support procedures.Required Skills and ExperienceStrong hands-on experience with mainframe technologies.Proficiency in COBOL| JCL| DB2| and VSAM.Experience with IBM AS400/iSeries technologies preferred.Knowledge of batch processing| job scheduling| and file transfer processes.Strong troubleshooting and problem-solving skills.Ability to work in production support and development environments.Good communication and teamwork skills.
Skills: Mainframe DB2 - Application Development
Experience Required: 10 & Above
Top 3 Required Skills:
We are seeking a skilled Mainframe and AS400 Developer to design, develop, maintain, and support enterprise applications running on mainframe and IBM AS400/iSeries platforms. The ideal candidate will have strong experience in COBOL, JCL, DB2, CL, RPG, and related legacy technologies, along with the ability to troubleshoot production issues and support business-critical systems.
Key Responsibilities
• Develop, enhance, and maintain applications on mainframe and AS400 (preferred) environments.
• Write and support programs using COBOL, JCL, DB2, CL, RPG, and related tools.
• Analyze business requirements and translate them into technical solutions.
• Perform debugging, testing, and production support for existing systems.
• Work with batch jobs, file processing, and data integration processes.
• Collaborate with business analysts, testers, and infrastructure teams.
• Support system upgrades, performance tuning, and incident resolution.
• Document technical designs, code changes, and support procedures.
Required Skills and Experience
• Strong hands-on experience with mainframe technologies.
• Proficiency in COBOL, JCL, DB2, and VSAM.
• Experience with IBM AS400/iSeries technologies preferred.
• Knowledge of batch processing, job scheduling, and file transfer processes.
• Strong troubleshooting and problem-solving skills.
• Ability to work in production support and development environments.
• Good communication and teamwork skills.
Top 3 Preferred Skills:
We are seeking a skilled Mainframe and AS400 Developer to design, develop, maintain, and support enterprise applications running on mainframe and IBM AS400/iSeries platforms. The ideal candidate will have strong experience in COBOL, JCL, DB2, CL, RPG, and related legacy technologies, along with the ability to troubleshoot production issues and support business-critical systems.
Key Responsibilities
• Develop, enhance, and maintain applications on mainframe and AS400 (preferred) environments.
• Write and support programs using COBOL, JCL, DB2, CL, RPG, and related tools.
• Analyze business requirements and translate them into technical solutions.
• Perform debugging, testing, and production support for existing systems.
• Work with batch jobs, file processing, and data integration processes.
• Collaborate with business analysts, testers, and infrastructure teams.
• Support system upgrades, performance tuning, and incident resolution.
• Document technical designs, code changes, and support procedures.
Required Skills and Experience
• Strong hands-on experience with mainframe technologies.
• Proficiency in COBOL, JCL, DB2, and VSAM.
• Experience with IBM AS400/iSeries technologies preferred.
• Knowledge of batch processing, job scheduling, and file transfer processes.
• Strong troubleshooting and problem-solving skills.
• Ability to work in production support and development environments.
• Good communication and teamwork skills.
• Education Requirements: Bachelors in Computer Science or other related field
• Years of Experience: 5 years, Project Code :

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