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Junior Mainframe Jobs in California (NOW HIRING)

Mainframe Specialist

San Diego, CA · On-site

$70K - $196K/yr

Mentor and coach junior team members, cultivating their mainframe and modernization skills. * Define and continuously refine the practice roadmap, aligning modernization initiatives with ...

Mainframe Specialist

Sacramento, CA · On-site

$70K - $196K/yr

Mentor and coach junior team members, cultivating their mainframe and modernization skills. * Define and continuously refine the practice roadmap, aligning modernization initiatives with ...

Mainframe Specialist

Walnut Creek, CA · On-site

$70K - $196K/yr

Mentor and coach junior team members, cultivating their mainframe and modernization skills. * Define and continuously refine the practice roadmap, aligning modernization initiatives with ...

Mainframe Specialist

San Francisco, CA · On-site

$70K - $196K/yr

Mentor and coach junior team members, cultivating their mainframe and modernization skills. * Define and continuously refine the practice roadmap, aligning modernization initiatives with ...

Mainframe Specialist

Mountain View, CA · On-site

$70K - $196K/yr

Mentor and coach junior team members, cultivating their mainframe and modernization skills. * Define and continuously refine the practice roadmap, aligning modernization initiatives with ...

Mainframe Specialist

Irvine, CA · On-site

$70K - $196K/yr

Mentor and coach junior team members, cultivating their mainframe and modernization skills. * Define and continuously refine the practice roadmap, aligning modernization initiatives with ...

Mainframe Specialist

Los Angeles, CA · On-site

$70K - $196K/yr

Mentor and coach junior team members, cultivating their mainframe and modernization skills. * Define and continuously refine the practice roadmap, aligning modernization initiatives with ...

... junior engineers and guide them in their professional growth. CI/CD Pipeline Champion: o Drive the establishment and optimization of robust CI/CD pipelines. o Advocate for a test-first approach ...

Mainframe/ITOM

Los Angeles, CA · On-site

$115K - $213K/yr

... junior team members on ITOM tooling best practices Required Skills & Experience 5-8 years of hands-on experience with IBM/Rocket ITOM report management tools Demonstrated experience performing ...

Mainframe/ITOM

Los Angeles, CA · On-site

$115K - $213K/yr

... junior team members on ITOM tooling best practices Required Skills & Experience 5-8 years of hands-on experience with IBM/Rocket ITOM report management tools Demonstrated experience performing ...

May act as an advisor or mentor to junior professionals. Under limited direction, implements a ... Demonstrated competency in working with computer software and mainframe applications to manipulate ...

May act as an advisor or mentor to junior professionals. Under limited direction, implements a ... Demonstrated competency in working with computer software and mainframe applications to manipulate ...

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Junior Mainframe information

What is the difference between Junior Mainframe vs Mainframe Developer?

AspectJunior MainframeMainframe Developer
CredentialsBasic certifications, entry-level experienceAdvanced certifications, several years of experience
Work EnvironmentSupport and maintenance tasks, learning-focusedDesign, development, and optimization of mainframe applications
Employer UsageEntry-level roles in finance, government, and large enterprisesSenior roles with more responsibility in similar industries

Junior Mainframe roles are typically entry-level, focusing on support and learning, while Mainframe Developers handle complex development tasks. The main difference lies in experience, responsibilities, and skill level, with Junior Mainframe positions serving as a stepping stone toward becoming a Mainframe Developer.

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

The most popular types of Mainframe jobs in California are:

What job categories do people searching Junior Mainframe jobs in California look for?

The top searched job categories for Junior Mainframe jobs in California are:

What cities in California are hiring for Junior Mainframe jobs?

Cities in California with the most Junior Mainframe job openings:

Infographic showing various Junior Mainframe job openings in California as of August 2026, with employment types broken down into 67% Full Time, and 33% Contract. Highlights an 33% In-person, 34% Hybrid, and 33% Remote job distribution.

Senior Main Frame Developer

Raas Infotek LLC

California City, CA • On-site

Other

Posted 2 days ago

New


Job description

Job Title: Senior Mainframe Developer


Experience: 10+ Years
Position Type: W2 only

Job Description:

We are seeking a highly experienced Senior Mainframe Developer with 10+ years of hands-on experience in legacy and modern mainframe technologies. The ideal candidate will have strong expertise in COBOL, JCL, and DB2, along with experience supporting mission-critical batch and online systems in large enterprise environments (banking, insurance, or financial services preferred). This role requires deep technical knowledge combined with the ability to analyze, enhance, and modernize legacy systems.

Key Responsibilities:

  • Design, develop, test, and maintain mainframe applications using COBOL, JCL, and CICS
  • Analyze and enhance existing legacy systems, ensuring minimal disruption to production
  • Write and optimize DB2/VSAM database queries and manage data structures
  • Develop and maintain batch processing jobs, troubleshoot job failures, and optimize job scheduling
  • Support online transaction processing systems via CICS and IMS DB/DC
  • Perform impact analysis, code reviews, and unit/system testing for new enhancements
  • Collaborate with business analysts to translate functional requirements into technical specifications
  • Participate in production support, incident resolution, and on-call rotation as needed
  • Support mainframe modernization initiatives (e.g., integration with APIs, cloud migration strategies)
  • Prepare and maintain technical documentation, run books, and system specifications
  • Mentor junior mainframe developers and support knowledge transfer

Required Skills:

  • 10+ years of hands-on experience in Mainframe development
  • Strong proficiency in COBOL, JCL, CICS, and DB2
  • Experience with VSAM file structures and IMS DB/DC (preferred)
  • Solid understanding of batch processing, job scheduling tools (CA-7, Control-M, or similar)
  • Experience with debugging tools (Xpediter, File-Aid, Abend-Aid, or similar)
  • Strong SQL skills for DB2 database querying and performance tuning
  • Familiarity with version control tools (Endevor, ChangeMan, or similar)
  • Experience working in Agile/Waterfall enterprise environments
  • Strong analytical and problem-solving skills with attention to detail in legacy code
  • Excellent communication skills for cross-functional collaboration with business and QA teams