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Senior Mainframe Developer Jobs in Wisconsin (NOW HIRING)

Mainframe Sr Developer

Milwaukee, WI · On-site

$90 - $120/hr

Mainframe Sr Developer Job ID: 2024-13158 Job Location: Milwaukee, WI or Lincoln, NE (100% Onsite) Job Travel Location(s): # Positions: 3 Employment Type: W2 Duration:Long Term # of Layers:0 Work ...

Mainframe Specialist

Milwaukee, WI · On-site

$70K - $196K/yr

Partner with cross-functional teams-architects, developers, QA, and business analysts-to gather ... Collaborate with senior leadership to secure executive sponsorship and organizational buy-in for ...

Senior CA-Gen Developer

Madison, WI · On-site

$55 - $72.50/hr

Senior CA-Gen Developer Onsite in Madison, WI 12+ month Video Interview Need local to Wisconsin ... a mainframe DB2 client-server environment * Ability to independently perform a variety of ...

WI · On-site

$80 - $100/hr

To design, develop, and maintain enterprise-grade applications on IBM Mainframe systems using COBOL ... Collaborate with cross-functional teams including business analysts, QA, and DevOps * Participate ...

WI · On-site

... of mainframe, batch, and cloud-native applications in AWS and Azure, using Java and Spring Boot ... You will mentor engineers, steer large-scale initiatives, and collaborate with senior management to ...

WI · On-site

$180 - $230/hr

Manages and oversees all design, development, and maintenance of mainframe and distributed ... Advises senior management on technical strategy.* Researches and recommends new technologies.

WI · On-site

$231K/yr

Manages and oversees all design, development, and maintenance of mainframe and distributed ... Advises senior management on technical strategy.* Researches and recommends new technologies.

WI · On-site

$100 - $130/hr

Ready to make an impact? We're seeking a skilled and proactive Senior Expert Engineer to strengthen ... IBM Mainframe: PL/I, DB2, MQ, CICS * Java or .Net development stacks as well as a good command of ...

Sr. Java Developer

Madison, WI · On-site

$57.75 - $73.50/hr

Experience building and deploying large scale Java web applications Conceptual knowledge of information technologies and methodologies in mainframe, midrange, Web and PC computing environments ...

Senior Software Engineer

Wausau, WI · Remote

$91K - $163K/yr

Solid understanding of software engineering processes: Design patterns, algorithms, data structures ... Required Qualifications: * 5 years of experience in Mainframe technologies (FSE) * 5 years of ...

Senior Software Engineer

Wausau, WI · On-site

$91K - $163K/yr

Solid understanding of software engineering processes: Design patterns, algorithms, data structures ... Required Qualifications: * 5+ years of experience in Mainframe technologies (FSE) * 5+ years of ...

Demonstrated ability to adapt to different mainframe/client environments and mainframe tool sets. Bonus if you have: * Minimum of 10 years experience working on FIS Systematics applications with ...

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Senior Mainframe Developer information

See Wisconsin salary details

$38

$58

$67

How much do senior mainframe developer jobs pay per hour?

As of Aug 22, 2026, the average hourly pay for senior mainframe developer in Wisconsin is $58.19, according to ZipRecruiter salary data. Most workers in this role earn between $54.62 and $63.56 per hour, depending on experience, location, and employer.

What is a senior mainframe developer?

Senior Mainframe Developers are experienced professionals who design, develop, and maintain mainframe systems—large-scale computers used by organizations for critical applications, bulk data processing, and enterprise resource planning. They are proficient in languages like COBOL, JCL, and Assembler, and often work with databases and transaction processing systems. Their responsibilities include troubleshooting system issues, optimizing performance, mentoring junior developers, and ensuring the reliability and security of mainframe operations.

What are some common challenges faced by senior mainframe developers when integrating legacy systems with modern technologies?

Senior Mainframe Developers often encounter challenges when integrating legacy mainframe systems with newer technologies such as cloud platforms, APIs, or microservices. These challenges include ensuring data consistency, maintaining system security, and minimizing downtime during migrations. Collaboration with cross-functional teams, such as infrastructure engineers and application developers, is key to developing seamless integration solutions. Staying up-to-date with modernization tools and best practices can help address these complexities and support the organization's digital transformation goals.

What are the key skills and qualifications needed to thrive as a senior mainframe developer, and why are they important?

To thrive as a Senior Mainframe Developer, you need deep expertise in mainframe programming languages (like COBOL, JCL, and PL/I), systems analysis, and a strong understanding of legacy application architectures, typically supported by a degree in computer science or related experience. Familiarity with tools such as IBM z/OS, DB2, CICS, and version control systems is essential, along with relevant certifications like IBM Certified System Programmer. Excellent problem-solving, communication, and leadership skills help you collaborate effectively and mentor junior developers. These skills are crucial for maintaining mission-critical systems, ensuring reliability, and guiding modernization efforts in complex enterprise environments.

What are the most commonly searched types of Mainframe Developer jobs in Wisconsin?

The most popular types of Mainframe Developer jobs in Wisconsin are:

What are popular job titles related to Senior Mainframe Developer jobs in Wisconsin?

For Senior Mainframe Developer jobs in Wisconsin, the most frequently searched job titles are:

What job categories do people searching Senior Mainframe Developer jobs in Wisconsin look for?

The top searched job categories for Senior Mainframe Developer jobs in Wisconsin are:

What cities in Wisconsin are hiring for Senior Mainframe Developer jobs?

Cities in Wisconsin with the most Senior Mainframe Developer job openings:

Infographic showing various Senior Mainframe Developer job openings in Wisconsin as of August 2026, with employment types broken down into 83% Full Time, 4% Part Time, and 13% Contract. Highlights an 80% Physical, 6% Hybrid, and 14% Remote job distribution, with an average salary of $121,038 per year, or $58.2 per hour.

Senior Mainframe Analyst (CooLGen expert)

CYNET SYSTEMS

Madison, WI • On-site

$50/hr

Contractor

Re-posted yesterday


Job description

Job Overview:

Requirement/Must Have:

  • 1+ years of experience in working on mainframe applications developed via CoolGen.
  • Strong experience in Mainframe technologies: COBOL, JCL, DB2, CICS.
  • Experience in business analysis and requirement gathering.
  • Good understanding of legacy system architecture and batch processing.

Responsibilities:

  • Perform reverse engineering and impact analysis for modernization initiatives.
  • Work with business stakeholders to translate requirements into functional and technical specifications.
  • Exposure to mainframe modernization, re-platforming, and re-engineering programs.
  • Ability to perform impact analysis and documentation.
 

Founded in 2010 and headquartered in the Washington, DC metro area, Cynet Systems Inc. is a leading staffing and recruiting powerhouse. Proudly recognized as a nationally and locally certified diversity firm, Cynet delivers agile, scalable talent solutions across industries. With an active footprint in all 50 U.S. states and Canada, we support thousands of consultants through our expansive, high-performing recruitment engine operating across North America and Asia—ensuring speed, quality, and consistency in every hire.

Cynet Systems logo

About Cynet Systems

Sourced by ZipRecruiter

Cynet Systems Inc is a staffing and recruiting corporation nestled in Ashburn, VA, USA. Established in 2010, the company operates within the Information Technology and Services sector, specializing in providing effective workforce solutions to different business needs, including IT consulting, direct hire, and contract staffing services. Through the years, Cynet Systems has built an impressive portfolio, going beyond borders and expanding its operations internationally in Canada and India. Rooted in its core values of teamwork, leadership, and commitment, Cynet Systems helps businesses unlock their full potential by providing versatile and competent professionals that perfectly align with their needs. Fueled by their unwavering mission to deliver top-tier talent to businesses worldwide, Cynet Systems garnered various recognitions including SIA's fastest-growing staffing firms and Best Place to Work in Virginia for 2019.

Industry

It services

Company size

501 - 1,000 Employees

Headquarters location

Sterling, VA, US

Year founded

2010

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