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Mainframe Tester Jobs in Colorado (NOW HIRING)

US Bank

z/OS Systems Engineer

Denver, CO

Participate in Disaster Recovery (DR) planning, testing, and recovery exercises to ensure business continuity and platform resiliency. * Manage and support mainframe hardware, coupling facilities ...

krg technology inc

Test Engineer

Denver, CO · On-site

Company Description Sevagan M sevagan at krgtech com ph-661-367-8000 Extn-513 Manual Testing of Web Service using REST / SOAP Telecom domain with TIBCO, SQL, Mainframe JavaScript / Java / Python - to ...

Stem Xpert

Database Administrator

Denver, CO · On-site

... DBMS) in a complex mainframe or network-based environment, similar in size and complexity to the client-server environment or web application, with skills in problem analysis, testing, and ...

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How much do mainframe tester jobs pay per hour?

As of Jul 19, 2026, the average hourly pay for mainframe tester in Colorado is $45.75, according to ZipRecruiter salary data. Most workers in this role earn between $35.14 and $55.10 per hour, depending on experience, location, and employer.

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

A Mainframe Tester needs strong analytical abilities, proficiency in mainframe environments (such as IBM z/OS), and knowledge of programming languages like COBOL, JCL, and SQL, often supported by a degree in computer science or a related field. Experience with test automation tools (e.g., IBM Rational, CA tools), debugging utilities, and relevant certifications like ISTQB can be highly beneficial. Excellent problem-solving skills, attention to detail, teamwork, and effective communication help testers excel in cross-functional teams. These skills and qualities are crucial for ensuring reliability, compliance, and performance of mission-critical mainframe systems in large organizations.

What are the typical responsibilities and daily tasks of a Mainframe Tester?

Mainframe Testers are primarily responsible for designing, developing, and executing test cases on mainframe applications to ensure their accuracy and performance. On a daily basis, you might review requirements, create test data, identify defects, and work closely with developers to resolve coding issues. The role often involves collaborating with business analysts and system architects to understand the application's functionality and ensure compliance with business and technical standards. Mainframe Testers frequently use specialized testing tools and may participate in both manual and automated testing cycles. This collaborative and detail-oriented environment helps ensure high-quality and reliable mainframe systems for the organization.

Is mainframe testing difficult?

Mainframe testing can be complex due to the legacy systems, specialized tools, and programming languages involved. It requires attention to detail, understanding of mainframe environments, and often knowledge of testing automation and scripting. While challenging, proper training and experience can make it manageable for testers.

What is a Mainframe Tester job?

A Mainframe Tester is responsible for testing applications running on mainframe systems to ensure their functionality, reliability, and security. They create and execute test cases, validate data processing, and identify defects in mainframe applications. They work with technologies like COBOL, JCL, DB2, and CICS to test batch and online processes. Their role is critical in industries like banking, insurance, and healthcare, where mainframes handle large-scale transaction processing. The tester collaborates with developers and business analysts to ensure the applications meet business requirements.

Can mainframe be replaced by AI?

Mainframe testers work with legacy systems that often require specialized knowledge of mainframe environments, programming languages, and testing tools. While AI can assist in automating certain testing tasks and improving efficiency, it is unlikely to fully replace mainframe testers due to the complexity and critical nature of mainframe systems. Human expertise remains essential for designing tests, interpreting results, and managing system-specific issues.

Is mainframe in demand?

Mainframe testing remains in demand due to the continued use of legacy systems in industries like finance and government. Skilled testers with knowledge of mainframe environments, COBOL, and testing tools are sought after to ensure system reliability and security.

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 experience in software testing and quality assurance. Gaining certifications such as IBM Certified Mainframe Application Developer can enhance your credentials, and familiarity with testing tools like CA Test Data Manager or IBM Rational Test Workbench is beneficial. Developing skills in scripting, debugging, and working within mainframe operating systems is essential for success in this role.
What are popular job titles related to Mainframe Tester jobs in Colorado? For Mainframe Tester jobs in Colorado, the most frequently searched job titles are:
What job categories do people searching Mainframe Tester jobs in Colorado look for? The top searched job categories for Mainframe Tester jobs in Colorado are:
Mainframe Tester jobs near you
Infographic showing various Mainframe Tester job openings in Colorado as of July 2026, with employment types broken down into 100% Full Time. Highlights an 83% In-person, and 17% Remote job distribution, with an average salary of $95,152 per year, or $45.7 per hour.
Senior Software Engineer- Mainframe/Assembler (Adabas & Natural)

Senior Software Engineer- Mainframe/Assembler (Adabas & Natural)

Software AG

Denver, CO • On-site

$130K - $145K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Posted 5 days ago

Job description

Software AG's products enable companies to convert their data into value. As a data pioneer, Software AG has been convincing thousands of market-leading companies worldwide with customer-oriented innovations for over 50 years.
Mainframe Adabas is the flagship product for Software AG. It is well known for its extremely high performance and reliability, with online transaction processing and is used to run customers' business and company-critical applications. Even after more than 50 years, Software AG Adabas continues to develop and adapt to new industry standards, business methods, and technologies.
The Mainframe Adabas family of products has a diverse portfolio. Support for high availability technology; IBM's SYSPLEX Technology and zIIP are key extensions to the DBMS. Additional add-on products include replication, monitoring, network, Auditing, security, large memory and various other optimizations.
For this position, we are looking for an experienced and motivated senior assembler developer who can support existing products or develop solutions for our customer base.
Be you, join us.
Location- Denver, CO (Hybrid)
Responsibilities
  • Design, implement, and optimize software written in IBM mainframe assembler in the z/OS environment.
  • Analyze, debug, and develop high-performance code for various products.
  • Implementation and testing of new code or enhancements for existing products.
  • Actively provide guidance, direction, and collaboration for QA and documentation
  • Take ownership and ensure proactive analysis and testing of products to avoid problems.
  • Contribution of creative and innovative ideas for products and features.

About You
  • 7+ years of professional software development experience with IBM z/Architecture 31-bit and 64-bit assembler instructions
  • Comprehensive knowledge and experience with IBM z/OS technology (architecture, software, and utilities)
  • Commitment to a high level of code quality and performance
  • Strong time-management skills, and the ability to manage complexities and competing priorities
  • Ability to combine judgment, experience, analytic and debugging skills, and business sense to make sound decisions
  • Very good Interpersonal/communication skills with sound writing skills
  • Useful to have experience with such technologies as zIIP, zEDC, Sysplex
  • Useful to have Network Communication Protocol experience (e.g. TCP/IP, CTCA, FCTC, XCF, VTAM)
  • Ability to work in a diverse and geographically distributed team
  • Self-motivated, self-developing and learning mindset

Application Deadline: 07/31/2026
What's in it for you?
Compensation
The annual base salary range for this position is $130,000 - $145,000.
This position is also eligible for a 10% discretionary annual bonus in accordance with relevant plan documents and award agreements.
Benefits
  • Company paid Holidays, Sick Leave, and Vacation time.
  • Paid Family Leave and other leaves of absence.
  • Community Service Day.
  • Medical, Dental, Vision, FSA/HSA, Life Insurance and Pet Insurance.
  • 401(k) Plan with up to 5% employer match.
  • Wellness Program.
  • Enjoy time and location flexibility with our Hybrid Working Model, which allows a remote workshare of up to 60%.
  • Set yourself up for success in your new role by upgrading your home office space using your one-time hybrid work payment.
  • Lean on the Employee Assistance Program for support during some of life's most common but difficult challenges.

At Software AG we are committed to providing an environment of mutual respect and fairness where equal employment opportunities are available to all applicants and employees without regard to race, colour, religion, gender, pregnancy, national origin, age, physical and mental disability, marital status, sexual orientation, gender identity, and any other characteristic protected by applicable law.
We believe that diversity, equity, and inclusion is critical to our success as a global company, and we seek to recruit, compensate, develop, promote, and retain the most talented people from a diverse candidate pool.
To all recruitment agencies: Software AG does not entertain unsolicited CVs without prior approval from Software AG's Talent Acquisition Team. Kindly refrain from sending CVs to our job's alias, Software AG employees, or any other organizational location without explicit consent. Software AG assumes no responsibility for any fees associated with unsolicited CVs.

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