Top 419 Mainframe developer Jobs

Senior ALC Developer
The C.A.S.E. Engineering Group —New Carrollton, MD
- $120,000 - $135,000 a year
- Weekends as needed
- Hybrid work
- Computer science
- Computer Science
- Research
- Health insurance
- Dental insurance
Quick Apply
4d
Revenue Accounting System Business Analyst
CGC Group Inc. —Miami, FL
- $35 an hour
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- Background check
- Azure
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9d
Mid Software Developer - Backend
Trilogy Innovations —Remote
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3d
Senior Developer – IBM z/OS Connect
Experis —Columbus, OH
- Contract
- 7 years
- In-person
- Senior level
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Mainframe Systems Programmer (BHJOB1435_35443)
Astyra Corporation —Raleigh, NC
- $52 - $54 an hour
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- SQL
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17h
Senior Specialist - Software Engineering (Mainframe Developer with Batch Processing Exp)
LTM —Berkeley Heights, NJ
- $81,215 - $129,800 a year
- In-person
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- Paid parental leave
- Paid holidays
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11+ Years Senior JAVA Developer - Washington DC (In-person interview)
AHU Technologies Inc —Washington, DC
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- Full-time
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Cobol Mainframe Developer - Onsite work at Atlanta, GA
INFO ORIGIN INC —Atlanta, GA
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Fixity Technologies LLC —Malvern, PA
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- 8 years
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Microsoft Developer
Barrow Wise Consulting —Springfield, IL
- $70,000 - $150,000 a year
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- 5 years
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FIS GMI Developers
Fixity Technologies LLC —Remote
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- 5 years
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Mainframe Developer
BITCO INSURANCE COMPANIES —Davenport, IA
- On call
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Mainframe Developer
Two95 International Inc. —Rosemont, IL
- Full-time
- Management
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Stellar IT Solutions LLC —St. Louis, MO
- $50 - $55 an hour
- Contract
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- Computer Science
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- 5 years
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Source Code Technology —Remote
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- Contract
- Remote
- Software troubleshooting
- Mid-level
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8d
COBOL Developer
Corpay —Oregon
- $115,000 - $130,000 a year
- Full-time
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- 5 years
- Bachelor's degree
- Health insurance
- Dental insurance
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IBM Mainframe Test Scheduler/Execution with IRS MBI and IRS Experience
MATRIX SYSTEMS & TECHNOLOGIES INC —Bowie, MD
- $60,000 - $80,000 a year
- Full-time
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- Health insurance
- Tuition reimbursement
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Senior Mainframe Developer
Vibotek LLC —Dallas, TX
- Full-time
- Azure
- System design
- AWS
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Mainframe Developer
Vytwo —Dallas, TX
- $50 an hour
- Full-time
- Hybrid work
- Research
- Mid-level
- Work from home
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Senior ALC Developer

The C.A.S.E. Engineering Group
New Carrollton, MD

Quick Apply

Job Details

Full-time
$120,000 - $135,000 a year
4 days ago

Benefits

Health insurance
Dental insurance
Paid time off
Vision insurance
Opportunities for advancement
Paid sick time

Qualifications

Jira
Application Integration
Performance tuning
Computer science
Systems integration
Software engineering
Teamwork
Computer Science
System performance optimization
Bachelor's degree
Assembly language
Mainframe
Mainframe development
System tuning
High availability

Full Job Description

Location: Hybrid – New Carrollton, MD (Lanham) with remote flexibility

Position Type: Full-Time

Reports To: Technical Program Manager

Note: This position is contingent upon contract award. Anticipated award date is end of July 2026.

About The C.A.S.E. Engineering Group

The C.A.S.E. Engineering Group is an Information Technology (IT) engineering firm that specializes in providing cybersecurity advisory services, modernizing IT architectures, developing and implementing IT strategic plans, and designing and engineering innovative systems, software, and applications. C.A.S.E. stands for Cybersecurity, Architecture, Strategy, and Engineering, which reflects both our core expertise and our belief that developing innovative solutions in unique environments requires a balanced approach. While C.A.S.E. tailors its solutions on a case-by-case basis to address the specific challenges organizations face, it also leverages industry best practices to ensure efficiency, security, and long-term success.

This position supports a mission-critical federal tax processing environment, where our team sustains and optimizes the core IBM mainframe systems that process the nation’s master file data. We are seeking a Senior ALC Developer with deep Assembly Language Coding expertise who can develop, debug, and optimize high-performance routines at the heart of these high-availability systems, and who excels at the system integration work that keeps a complex mainframe environment running reliably.

We seek professionals who are not only technically proficient but also adaptable, analytical, and dedicated to excellence—ensuring that we continue to provide our clients with the best expertise available.

Position Overview

The Senior ALC Developer will be responsible for developing, maintaining, debugging, and optimizing Assembly Language Coding (ALC) applications on an IBM Mainframe platform in support of a federal tax processing and master file research environment. This role requires extensive experience in mainframe application development, a strong command of system integration within a high-availability environment, and the ability to troubleshoot and optimize performance at a low level. The developer will collaborate with cross-functional teams to resolve production issues, implement enhancements, and ensure all changes meet federal standards before deployment.

This is a full-time, hybrid role requiring availability during normal business hours, with occasional night and weekend work as needed based on project demands. Personnel must have reasonable access to the government site in Lanham, MD and be able to travel there within two hours’ notice. The Senior ALC Developer reports to the Technical Program Manager and works closely with development, testing, and operations teams to ensure high-quality software development and system integration.

Key Responsibilities

Develop, test, debug, and maintain Assembly Language Coding (ALC) applications on an IBM Mainframe platform
Perform mainframe application development, optimization, and low-level performance tuning
Support system integration efforts within a complex, high-availability environment
Work extensively with Job Control Language (JCL), AEV JCL, VSAM, Panels, Copybooks, and Skeleton PROCS
Troubleshoot and resolve production problems in a timely manner to sustain system availability
Follow Production Environment Control Process (PECP) guidelines and the ServiceNow ticket and Endevor transmittal processes
Use CFOL Command Codes for research and support analysis of IRS Individual and Business Master Files
Design, modify, and document coding changes for application enhancements and legislative mandates
Perform peer reviews and ensure adherence to coding best practices
Ensure software changes are defect-free before deployment to production
Produce Enterprise Life Cycle (ELC) documentation such as DSR, iBSR, ICD, and TRR
Utilize the IBM Engineering Lifecycle Management (ELM) Tool Suites, including DOORS Next, Jira, and Endevor
Support Agile development practices and collaborate with stakeholders to define and implement technical solutions

Qualifications

Education:

Bachelor’s degree in Computer Science, Information Systems, or a related field (or equivalent experience)

Experience:

At least 8 years of experience in ALC (Assembler Language) development
Strong experience in mainframe application development, debugging, and optimization
Expertise in system integration and working within a high-availability environment

Technical Expertise:

IBM Mainframe Assembly Language Coding (ALC)
IBM Suite, File Manager, Job Control Language (JCL), AEV JCL, and IBM Debugger
VSAM, Panels, Copybooks, and Skeleton PROCS
Endevor and the Service Now ticket / Endevor transmittal processes
IBM Engineering Lifecycle Management (ELM) Tool Suites, e.g., IBM Requirements Management
DOORS Next and Jira
CFOL Command Codes for research

Additional Skills:

Strong problem-solving and debugging skills with attention to detail
Knowledge of the IRS Individual and Business Master File systems is highly desirable
Familiarity with Enterprise Life Cycle (ELC) process and documentation, and Agile methodologies
Knowledge of RHEL 8 containerization and Cloud Migration is a plus
Ability to collaborate in a team-oriented environment and communicate effectively with
technical and non-technical stakeholders
Adaptability in a fast-paced, evolving work environment with shifting priorities

Clearance:

Must be able to obtain and maintain an IRS Minimum Background Investigation (MBI); U.S. work authorization required

Why Join Us?

Work with mission-critical systems that directly support federal tax processing operations
Apply specialized Assembly Language expertise on high-impact, high-visibility systems
Be part of a growing company that values innovation, technical excellence, and problem-solving
Hybrid role offering flexibility and work-life balance
Opportunities for professional growth and advancement

Pay: $120,000.00 - $135,000.00 per year

Benefits:

Dental insurance
Health insurance
Paid sick time
Paid time off
Vision insurance

Application Question(s):

What are your salary expectations?

Location:

New Carrollton, MD 20784 (Required)

Work Location: Hybrid remote in New Carrollton, MD 20784

Quick Apply

Refine Your Search

mainframe developer jobs

Senior ALC Developer

Revenue Accounting System Business Analyst

Mid Software Developer - Backend

Senior Developer – IBM z/OS Connect

Mainframe Systems Programmer (BHJOB1435_35443)

Senior Specialist - Software Engineering (Mainframe Developer with Batch Processing Exp)

11+ Years Senior JAVA Developer - Washington DC (In-person interview)

Cobol Mainframe Developer - Onsite work at Atlanta, GA

Mainframe COBOL developer

Mainframe Developer w/AWS

Microsoft Developer

FIS GMI Developers

Mainframe Developer

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Senior Dynamics 365 & Power Platform Developer

CA Endevor to IBM DBB / IDz / UCD Migration Developer

COBOL Developer

IBM Mainframe Test Scheduler/Execution with IRS MBI and IRS Experience

Senior Mainframe Developer

Mainframe Developer

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