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As400 Testing Jobs in Prosper, TX (NOW HIRING)

QA Lead

Irving, TX · On-site

$100K - $120K/yr

OMS, WMS, TMS * eCommerce & Digital platforms * iSeries / AS400 * API testing (Postman, SOAP UI) * SQL & database validation * CI/CD and DevOps-enabled testing Apply Today! CP# 8528

... with application testing, system changes, and production deployments. * Promote self-service ... Experience with IBM i (iSeries/AS400), Salesforce, Boomi, or similar enterprise applications.

Product Engineer

Plano, TX · On-site

$85 - $110/hr

... Testing * Test and/or evaluate software or firmware used by engineering. * Initiate and oversee ... AS400, sheet metal forming and fabrication, air movement principles, and fan/blower laws are a plus.

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.

What job categories do people searching As400 Testing jobs in Prosper, TX look for?

The top searched job categories for As400 Testing jobs in Prosper, TX are:

Infographic showing various As400 Testing job openings in Prosper, TX as of July 2026, with employment types broken down into 5% Locum Tenens, 76% Full Time, 13% Part Time, 2% Contract, 1% Nights, and 3% Summer. Highlights an 96% Physical, 2% Hybrid, and 2% Remote job distribution.

Senior SYNON/AS400 Developer

Cognizant Technology Solutions

Dallas, TX • On-site

$65K - $117K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Posted 17 days ago


Cognizant rating

7.0

Company rating: 7.0 out of 10

Based on 87 frontline employees who took The Breakroom Quiz

59th of 72 rated business consultants


Job description

About the role
As a Senior SYNON/AS400 Developer, you will make an impact by designing, developing, and supporting business-critical applications in an AS400 environment. You will be a valued member of the technology team, collaborating with business analysts, technical leads, quality assurance teams, and stakeholders to deliver high-quality solutions throughout the software development lifecycle.
In this role, you will:
• Partner with business analysts and technical leads to clarify requirements and define technical solutions.
• Analyze business needs and prepare technical designs, estimates, and development plans.
• Develop, review, and enhance applications using AS400 technologies including RPGLE, RPGILE, CLLE, and SYNON.
• Create and execute unit test plans, resolve defects, and support quality assurance and regression testing activities.
• Support deployments, production releases, and post-implementation activities to ensure stable and successful solution delivery.
Work model:
We strive to provide flexibility wherever possible. Based on this role's business requirements, this is a remote position open to qualified applicants in Richardson, TX. Regardless of your working arrangement, we are here to support a healthy work-life balance though our various wellbeing programs.
The working arrangements for this role are accurate as of the date of posting. These may change based on the project you are engaged in, as well as evolving business and client requirements. We will always be transparent about role expectations.
Please note: Some roles may require in-person interviews at Cognizant offices or client locations based on project needs.
What you need to have to be considered
• Strong experience working in AS400/IBM i development environments.
• Hands-on expertise with RPGLE and RPGILE programming.
• Proficiency in CLLE development and system-level programming.
• Experience developing and maintaining applications using SYNON.
• Ability to participate in the full software development lifecycle, including analysis, design, coding, testing, deployment, and production support.
This will help you stand out
• Experience preparing technical estimates and solution designs.
• Strong troubleshooting and defect-resolution skills.
• Experience supporting QA, regression testing, and production deployments.
• Ability to collaborate effectively with cross-functional technical and business teams.
• Experience in post-production support and warranty-period activities.
Salary and Other Compensation:
The annual salary for this position is between $65,447 to $117,000 depending on experience and other qualifications of the successful candidate.
This position is also eligible for Cognizant's discretionary annual incentive program, based on performance and subject to the terms of Cognizant's applicable plans.
Benefits:
Cognizant offers the following benefits for this position, subject to applicable eligibility requirements:
• Medical/Dental/Vision/Life Insurance
• Paid holidays plus Paid Time Off
• 401(k) plan and contributions
• Long-term/Short-term Disability
• Paid Parental Leave
• Employee Stock Purchase Plan
Disclaimer:
The salary, other compensation, and benefits information is accurate as of the date of this posting. Cognizant reserves the right to modify this information at any time, subject to applicable law.
*Please note, this role cannot offer visa transfer or sponsorship now or in the future*
About Cognizant:
Cognizant (Nasdaq: CTSH) is an AI Builder and technology services provider, bridging the gap between AI investment and enterprise value by building full-stack AI solutions for our clients. Our deep industry, process and engineering expertise enables us to build an organization's unique context into technology systems that amplify human potential, drive tangible outcomes and keep global enterprises ahead in a fast-changing world. See how at cognizant.ai or @cognizant.
Additional employment information
Compensation information is accurate as of the date of this posting. Cognizant reserves the right to modify this information at any time, subject to applicable law.
Applicants may be required to attend interviews in person or by video conference. In addition, candidates may be required to present their current state or government issued ID during each interview.
Cognizant is an equal opportunity employer. Your application and candidacy will not be considered based on race, color, sex, religion, creed, sexual orientation, gender identity, national origin, disability, genetic information, pregnancy, veteran status or any other characteristic protected by federal, state or local laws.
If you have a disability that requires reasonable accommodation to search for a job opening or submit an application, please email [email protected] for roles based in the Americas or [email protected] for roles based in India.

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