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Mainframes Developer Jobs in Illinois (NOW HIRING)

AND Principal Responsibilities The Mainframe Senior Developer is responsible for installing, maintaining, upgrading, and supporting various system software products for TNT's z/OS operating system ...

Mainframe Senior Developer

Chicago, IL · On-site

$99K - $169K/yr

AND Principal Responsibilities The Mainframe Senior Developer is responsible for installing, maintaining, upgrading, and supporting various system software products for TNT's z/OS operating system ...

Tandem Developer

Rolling Meadows, IL · On-site

$49.25 - $63.25/hr

Tandem Developer Job Location: Rolling Meadows,IL Job Type: Contract Technical Skills: * Strong ... CICS,JCL,Mainframe Enterprise Cobol,Mainframe DB2,Z/OS,CICS Admin,Mainframe - COBOL/JCL/CICS ...

Mainframe developer

Chicago, IL · On-site

$50.50 - $65/hr

IBM Mainrame experience JCL DB2 Strong SQL Skills Experience in developing Stored procedures Strong Assembler programming / debugging skills COBOL programming language PL/1 Programming LAnguage CICS ...

Cobol Developer

Springfield, IL · On-site

$49.75 - $67.50/hr

An experienced developer with mainframe/COBOL experience to work in business application development. Environment and tools are IBM Mainframe platform, z/OS operating system, TSO/ISPF and DB2.

Mainframe Manager

Chicago, IL · On-site +1

$111K - $178K/yr

At Capgemini Engineering, the world leader in engineering services, we bring together a global team ... About the role you're considering We are seeking an experienced Mainframe Manager to lead and ...

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Mainframes Developer information

What does a mainframe developer do?

A mainframe developer designs, codes, tests, and maintains applications running on mainframe computers, often using languages like COBOL, PL/I, or Assembler. They work in environments that require high reliability and security, and may also handle system updates, performance tuning, and integration with other systems.

What is mainframe developer salary?

The salary for a mainframe developer typically ranges from $70,000 to $120,000 annually, depending on experience, location, and certifications. Senior roles or those with specialized skills in COBOL, JCL, or mainframe environments may earn higher compensation. Many positions also offer benefits such as health insurance and retirement plans.

Can mainframe be replaced by AI?

Mainframes are large-scale computing systems used for critical enterprise applications, and while AI can automate certain tasks and improve efficiency, it does not replace the core functions of mainframes. Mainframe developers often work with legacy systems, COBOL programming, and security protocols, which require specialized skills that are not fully replaced by AI technologies.

Is mainframe still in demand?

Mainframes remain in demand for large enterprises such as banks, insurance companies, and government agencies that rely on their reliability, security, and processing power. Mainframe developers with skills in COBOL, JCL, and mainframe environments are sought after to maintain and upgrade legacy systems, though the overall demand has decreased as organizations adopt cloud and distributed computing. Certification and experience with mainframe tools can enhance job prospects in this specialized field.

What is the difference between Mainframes Developer vs Mainframes Analyst?

AspectMainframes DeveloperMainframes Analyst
Required CredentialsTypically a degree in Computer Science or related field; certifications like IBM Certified SpecialistSimilar credentials; often holds certifications in mainframe systems and analysis
Work EnvironmentDevelops, codes, and tests mainframe applications in a software development settingAnalyzes existing mainframe systems, gathers requirements, and supports system improvements
Employer & Industry UsageUsed by banks, insurance companies, and large enterprises for application developmentEmployed in similar industries for system analysis, troubleshooting, and process optimization

While both roles require knowledge of mainframe systems and similar credentials, Mainframes Developers focus on creating and maintaining mainframe applications, whereas Mainframes Analysts analyze existing systems to improve performance and efficiency. Both roles are vital in large enterprise IT environments.

What job categories do people searching Mainframes Developer jobs in Illinois look for? The top searched job categories for Mainframes Developer jobs in Illinois are:
What cities in Illinois are hiring for Mainframes Developer jobs? Cities in Illinois with the most Mainframes Developer job openings:
Infographic showing various Mainframes Developer job openings in Illinois as of June 2026, with employment types broken down into 33% Full Time, and 67% Contract. Highlights an 92% In-person, and 8% Hybrid job distribution.
Mainframe Senior Developer

Mainframe Senior Developer

Northern Trust

Chicago, IL

$99K - $169K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Posted 10 days ago


Northern Trust rating

8.0

Company rating: 8.0 out of 10

Based on 23 frontline employees who took The Breakroom Quiz


Job description

About Northern Trust:

Northern Trust, a Fortune 500 company, is a globally recognized, award-winning financial institution that has been in continuous operation since 1889.

Northern Trust is proud to provide innovative financial services and guidance to the world's most successful individuals, families, and institutions by remaining true to our enduring principles of service, expertise, and integrity. With more than 130 years of financial experience and over 22,000 partners, we serve the world's most sophisticated clients using leading technology and exceptional service.

Northern Trust is looking for a consultant for the role of Mainframe Senior Developer to join its existing Project team located in Chicago.

Job Description AND Principal Responsibilities

The Mainframe Senior Developer is responsible for installing, maintaining, upgrading, and supporting various system software products for TNT's z/OS operating system environment. They require skills including, but not limited to DB2 database and tools, COBOL and PL/1 programming, JCL, and Strong Assembly level Programming skills along with CICS expertise.

The resource should be able to confidently:

Communicate status to, and work in conjunction with client stakeholders, project managers, team

members, and management.

. Work on Primitive CICS Systems and re-create them in lower environment.

. Work on Assembler and PL/1 Programs to modify, test and De-bug Efficiently.

. Provide solutions to modernize existing primitive architecture based on mainframe systems.

Ensure solutions provide system stability by following best practices and TNT change control and

support methodologies

. work to arrive at multiple design features and brainstorm with the team/SME's.

Analyze, evaluate, troubleshoot, test, document, and implement system software upgrades and new

software packages per client specifications

Support Software Development Lifecycle (SDLC) methodologies and Agile Framework

Ensure peak software/system performance by monitoring software usage and implementing

suggested changes

Adapt to changing roles and dynamic priorities

Work with people of different personalities and backgrounds

Prioritize work independently

Modernization Experience

Education/Experience:

15+ years of experience required in the following areas:

- IBM mainframe experience

- JCL

- DB2

o Strong SQL Skills

o Experience in developing Stored Procedures - both Cobol and Native

- Strong Assembler Programming/De-bugging skill.

- Cobol Programming Language

- PL/1 Programming Language

- CICS

-Handson Github/IDz Experience

- Good knowledge and hands-on experience on IBM utilities, FileAid, QMF, SPUFI

- Knowledge of DFSORT, Version control tool

- Excellent oral and written communication skills are required

- Independently makes sound and timely, fact-based decisions.

- - Microsoft Visio.

Bachelor's Degree in Computer Science, Information Management, or related field preferred

Nice to Have:

- Experience in Control-M Scheduling

- Data Analysis tools and skills

- Preferred Financial Services/Banking experience.

Salary Range:

$99,600 - 169,200 USD

Salary range is a good faith estimate of base pay. Northern Trust provides a comprehensive benefits package including retirement benefits (401k and pension), health and welfare benefits (medical, dental, vision, spending accounts and disability), paid time off, parental and caregiver leave, life & accident insurance, and other voluntary and well-being benefits. Northern Trust also provides a discretionary bonus program that may include an equity component.

Working with Us:

As a Northern Trust partner, greater achievements await. You will be part of a flexible and collaborative work culture in an organization where financial strength and stability is an asset that emboldens us to explore new ideas.

Movement within the organization is encouraged, senior leaders are accessible, and you can take pride in working for a company committed to assisting the communities we serve!Join a workplace with a greater purpose.

We'd love to learn more about how your interests and experience could be a fit with one of the world's most admired and sustainable companies! Build your career with us andapply today.#MadeForGreater

Reasonable accommodation

Northern Trust is committed to working with and providing reasonable accommodations to individuals with disabilities. If you need a reasonable accommodation for any part of the employment process, please email our HR Service Center at MyHRHelp@ntrs.com.


We hope you're excited about the role and the opportunity to work with us. We value an inclusive workplace and understand flexibility means different things to different people.

Apply today and talk to us about your flexible working requirements and together we can achieve greater.


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