ZipRecruiter

Log In

1

Mainframe Testing Jobs in Delaware (NOW HIRING)

Centstone

Mainframe Assembler

Wilmington, DE · On-site

$45 - $55/hr

Experience with application design, coding, testing, debugging, and production support. * Solid ... Mainframe Assembler Developer * Employment Type: Contract * * Industry: Enterprise Technology

VIS IT Solutions Inc

Mainframe Developer

Wilmington, DE · On-site

$47.50 - $61.25/hr

Mainframe Developer - Day 1 Onsite Location: Wilmington, DE & Jersey City, NJ (Weekly 5 days office ... Work with system analysts, QA testers, and infrastructure teams to ensure system integrity and ...

Saransh Inc

SDET - Java Coding

Wilmington, DE · On-site

Selenium, Automation, Java Coding exp is must, API Automation, Mainframe Testing, TOSCA * Design, develop, and maintain scalable test automation frameworks and Automation background is must, get SDET ...

Centstone

Mainframe IMS & CICS Developer

Wilmington, DE · On-site

$45 - $55/hr

Mainframe IMS & CICS Developer Location: Wilmington, DE (100% Onsite - 5 Days/Week) Pay Rate: $45 ... Perform unit testing, system integration testing, troubleshoot production issues, and provide ...

Hirekeyz Inc

Mainframe IMS DB Developer

Wilmington, DE · On-site

$47.50 - $61.25/hr

Hands-on practical experience in system design, application development, testing, and operational stability * Hands-on experience in Mainframe Assembler programming, IMS, DB2 * Experience in ...

SR Partners LLC

Mainframe IMS DB with CICS

Wilmington, DE · On-site

$47.50 - $61/hr

Mainframe with IMS DB with CICS Location: Wilmington, DE (Onsite from Day 1) Required ... testing, and operational stability Proficient in coding in one or more languages. Experience in ...

Morgan Stanley

Mainframe CICS Systems Engineer

Wilmington, DE · On-site

$47.50 - $61.25/hr

... testing, application releases, and ongoing monitoring and support for over 3,000 production ... The Mainframe CICS Systems Programmer/Engineer is responsible for all phases of CICS engineering ...

Monitise

Mainframe Sr. Advisor

Wilmington, DE

$121K - $193K/yr

Job Title Mainframe Sr. Advisor About your role: At Fiserv, we are dedicated to transforming ... Perform advanced coding, testing, and debugging of applications to ensure optimal performance.

next page

Showing results 1-20

All JobsMainframe Testing JobsMainframe Testing Jobs in Delaware

Mainframe Testing information

What is mainframe testing?

A Mainframe Testing job involves validating and verifying applications running on mainframe systems to ensure they function correctly, efficiently, and securely. Testers perform various types of testing, including functional, integration, regression, and performance testing, using tools like JCL, COBOL, DB2, and CICS. They analyze test results, identify defects, and collaborate with developers to resolve issues. Mainframe testers need knowledge of batch processing, databases, and system interactions to ensure seamless operations. The role is critical in industries like banking, insurance, and healthcare, where mainframes handle high-volume transactions.

What are the key skills and qualifications needed to thrive in mainframe testing?

To thrive in Mainframe Testing, you need strong analytical abilities, a solid understanding of mainframe environments and programming languages like COBOL, JCL, and experience with testing methodologies. Familiarity with tools such as IBM Mainframe, CA7/Endevor, and mainframe testing frameworks, as well as ISTQB certification, is highly valuable. Attention to detail, strong problem-solving skills, and effective communication are essential soft skills in this role. These competencies help ensure that complex mainframe systems are thoroughly tested, reliable, and meet business requirements.

What are some common challenges faced by professionals working in mainframe testing?

Professionals in Mainframe Testing often encounter challenges such as understanding legacy code, dealing with limited documentation, and adapting to the evolving integration of mainframe and modern systems. Testers must also effectively validate large volumes of data, ensure compatibility across interconnected applications, and manage tight release deadlines. Collaborating closely with developers, business analysts, and operations teams is essential for clarifying requirements and troubleshooting issues. Successfully overcoming these challenges requires persistence, a willingness to learn, and strong teamwork skills.

How to be a mainframe tester?

To become a mainframe tester, you should have a strong understanding of mainframe environments, including COBOL, JCL, and DB2, along with testing tools like IBM Rational or CA Test Data Manager. Gaining experience in software testing, scripting, and understanding mainframe architecture is essential, often supported by certifications such as IBM Certified Solution Developer. Attention to detail and the ability to work with legacy systems are important in this role.

What are popular job titles related to Mainframe Testing jobs in Delaware?

For Mainframe Testing jobs in Delaware, the most frequently searched job titles are:

What job categories do people searching Mainframe Testing jobs in Delaware look for?

The top searched job categories for Mainframe Testing jobs in Delaware are:

Mainframe Testing jobs near you
Infographic showing various Mainframe Testing job openings in Delaware as of September 2026, with employment types broken down into 1% Internship, 1% As Needed, 84% Full Time, 11% Part Time, 2% Contract, and 1% Nights. Highlights an 88% Physical, 3% Hybrid, and 9% Remote job distribution.

Mainframe Assembler

Wilmington, DE • On-site

Donato Technologies, Inc
IT Services • 51 - 200 employees
Learn more about Donato Technologies, Incexternal

$60/hr

Contractor

Re-posted 28 days ago

Job description

RTTO – 5 Days Onsite

Job Description:


Design, coding, and testing: Mainframe assemblers are responsible for designing, coding, and testing application programs using the IBM Assembler language. They should also be familiar with the entire Software Development Life Cycle (SDLC) and have a solid understanding of mainframe operating systems, such as z/OS. 


Debugging and troubleshooting: They perform debugging and troubleshooting of mainframe applications to ensure they function correctly and efficiently. 


Documentation: Mainframe assemblers may also be responsible for documenting the design of the assembler programs, explaining how they work, and providing guidelines for their use. 

Technical support: They provide technical support for mainframe systems, optimizing performance, and ensuring compliance with coding standards and technical design. 

These assemblers work closely with system architects and analysts to understand the requirements and specifications of a system, and then translate these into efficient, low-level machine code. They must keep themselves updated with the latest mainframe technologies and assembler programming techniques to ensure the continuous functionality and reliability of mainframe systems. 

Donato Technologies Inc. is a trusted IT staffing, consulting, and software development partner headquartered in Dallas, Texas. We support clients across industries by understanding their unique business needs and delivering tailored technology and workforce solutions. Our focus is on connecting the right talent with the right opportunity-ensuring clients receive dependable, skilled professionals and candidates receive meaningful career growth and support. We work closely with small to mid-sized organizations to provide flexible, high-quality services that drive performance, innovation, and long-term success.