ZipRecruiter

Log In

1

Mainframe Development Jobs in Maryland (NOW HIRING)

Serigor, Inc.

Senior .NET Developer (Onsite)

Columbia, MD · On-site

$53.75 - $70.75/hr

Experience supporting Mainframe modernization, automated code conversion, and enterprise ... NET development experience * Strong hands-on expertise with: * C# * ASP.NET / ASP.NET Core * .NET ...

Metadimensions

JAVA Web Services

Woodlawn, MD · On-site

* This position required development support for redesigning the mainframe applications to web applications and web-services. * The responsibilities will also include maintaining in the current ...

Peraton

Senior Software Automation Engineer

Lanham, MD · On-site

$110K - $143K/yr

Use Government or Contractor-developed documentation to construct test cases with predetermined ... Experience with IBM Mainframe or Unisys Mainframe applications and operations. * Experience ...

Peraton

Senior Software Automation Engineer

Lanham, MD · On-site

$110K - $143K/yr

Use Government or Contractor-developed documentation to construct test cases with predetermined ... Experience with IBM Mainframe or Unisys Mainframe applications and operations. * Experience ...

Peraton

Senior Software Automation Engineer

Lanham, MD · On-site

$80K - $128K/yr

Use Government or Contractor-developed documentation to construct test cases with predetermined ... Experience with IBM Mainframe or Unisys Mainframe applications and operations. * Experience ...

Peraton

Mid-Level Software Test Engineer

Lanham, MD · On-site

$80 - $100/hr

Use Government or Contractor-developed documentation to construct test cases with predetermined ... Experience with IBM Mainframe or Unisys Mainframe applications and operations * Market knowledge of ...

Zenius

Principal CICS Systems Programmer

Woodlawn, MD · On-site

Leverage deep expertise in CICS system programming, application development, IBM MQ, CICS Transaction Gateway, SAS, REXX, IBM utilities, SMP/E, z/OSMF, COTS tools, and z/OS to optimize mainframe ...

Metadimensions

Ab-Initio Developer

Woodlawn, MD · On-site

Maintenance of UNIX shell scripting for creating project directories on the UNIX System Services side of Mainframe. * Guidance for best practices with regard to development of Ab Initio graphs.

previous pagenext page

Showing results 21-40

All JobsMainframe Development JobsMainframe Development Jobs in Maryland

Mainframe Development information

See Maryland salary details

$28.4K

$90.4K

$143.5K

How much do mainframe development jobs pay per year?

As of Sep 8, 2026, the average yearly pay for mainframe development in Maryland is $90,368.00, according to ZipRecruiter salary data. Most workers in this role earn between $71,267.00 and $111,635.00 per year, depending on experience, location, and employer.

What is the difference between Mainframe Development vs Mainframe Testing?

AspectMainframe DevelopmentMainframe Testing
Primary FocusDesigning, coding, and maintaining mainframe applicationsVerifying and validating mainframe applications for bugs and performance
Required SkillsCOBOL, JCL, DB2, CICSTesting tools, scripting, debugging, knowledge of mainframe environments
Work EnvironmentDevelopment teams, coding in mainframe environmentsQuality assurance teams, testing labs, mainframe systems
CertificationsCOBOL certifications, IBM mainframe certificationsISTQB, mainframe testing certifications

While Mainframe Development involves creating and maintaining mainframe applications, Mainframe Testing focuses on ensuring those applications work correctly and efficiently. Both roles require knowledge of mainframe environments and related skills, but they serve different stages in the software lifecycle.

Is mainframe development a good career?

Mainframe development is a stable career with high demand in industries like finance and government that rely on legacy systems. It requires knowledge of languages such as COBOL and tools like JCL, and often offers competitive salaries and job security due to the specialized skills involved.

Is mainframe development still in demand?

Mainframe development remains in demand in industries such as finance, government, and healthcare that rely on legacy systems for critical operations. Skilled mainframe developers with knowledge of COBOL, JCL, and mainframe environments are sought after to maintain and modernize these systems, ensuring their continued relevance in enterprise IT infrastructure.

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 typically collaborate with system administrators and analysts to ensure smooth operation of enterprise systems.
Mainframe Development jobs near you
Infographic showing various Mainframe Development job openings in Maryland as of August 2026, with employment types broken down into 1% As Needed, 82% Full Time, 15% Part Time, and 2% Contract. Highlights an 89% Physical, 3% Hybrid, and 8% Remote job distribution, with an average salary of $90,368 per year, or $43.4 per hour.

Senior .NET Developer (Onsite)

Columbia, MD • On-site

Serigor, Inc.
Construction • 51 - 200 employees
Learn more about Serigor, Inc.external

$53.75 - $70.75/hr

Full-time

This job post has expired 1 day ago. Applications are no longer accepted.

Key responsibilities

  • Design, develop, enhance, and support enterprise-grade applications using modern .NET technologies

  • Support Mainframe-to-.NET modernization and migration initiatives, including AI-assisted code conversion efforts

  • Develop RESTful APIs, gRPC services, backend services, batch jobs, and distributed integration solutions

Job description

Job Title: Senior .NET Developer (Onsite)
Location: Columbia, MD
Job Type: Full-Time
Job Description:
  • We are seeking a highly experienced Senior .NET Developer to support large-scale enterprise modernization initiatives focused on transforming legacy Mainframe applications into modern, cloud-ready .NET platforms.
  • The ideal candidate will have strong expertise in enterprise Microsoft technologies, distributed systems, APIs, database modernization, DevOps, and cloud platforms. This role involves working closely with modernization teams to support application conversion, remediation, integration, testing, and cloud enablement efforts.
  • Experience supporting Mainframe modernization, automated code conversion, and enterprise transformation programs is highly preferred.

Key Responsibilities:
  • Design, develop, enhance, and support enterprise-grade applications using modern .NET technologies
  • Support Mainframe-to-.NET modernization and migration initiatives, including AI-assisted code conversion efforts
  • Refactor and optimize converted code to align with modern .NET engineering standards and architecture principles
  • Develop RESTful APIs, gRPC services, backend services, batch jobs, and distributed integration solutions
  • Build scalable, maintainable, and high-performance applications
  • Support enterprise database modernization, data migration, DB2 integration, and SQL Server optimization
  • Collaborate with Mainframe SMEs, architects, QA teams, DevOps engineers, and business analysts
  • Support remediation, integration testing, regression testing, and functional equivalence validation
  • Contribute to CI/CD pipelines, DevOps automation, deployment processes, and modernization frameworks
  • Troubleshoot application issues, perform root cause analysis, debugging, and performance tuning
  • Work within AWS and Azure cloud environments
  • Develop technical documentation, deployment guides, and operational runbooks
  • Mentor junior developers and contribute to engineering best practices

Required Qualifications:
  • 10+ years of enterprise .NET development experience
  • Strong hands-on expertise with:
    • C#
    • ASP.NET / ASP.NET Core
    • .NET Framework / .NET Core / .NET 6+
    • Web APIs / RESTful Services
    • gRPC Services
    • Entity Framework / EF Core
    • Angular and/or React
    • JavaScript
    • LINQ
    • Windows Services and scheduled batch processing
    • PowerShell scripting
  • Strong experience building distributed and service-oriented applications
  • Solid understanding of:
    • Object-Oriented Programming (OOP)
    • SOLID principles
    • Design patterns
    • Secure coding practices
  • Experience with:
    • Microservices architecture
    • API integrations
    • Git and Azure DevOps
    • CI/CD pipelines and DevOps automation
    • Docker and containerization
    • Kubernetes or container orchestration platforms
  • Strong database expertise with:
    • Microsoft SQL Server
    • DB2
    • Stored procedures
    • Query optimization
    • Data migration and performance tuning
  • Experience with messaging/event technologies such as Kafka, RabbitMQ, or Azure Service Bus
  • Strong troubleshooting, debugging, and optimization skills
  • Experience working in Agile/Scrum environments
  • Excellent written and verbal communication skills

Cloud & Infrastructure Experience
AWS Experience with:
  • EC2
  • S3
  • IAM
  • CloudWatch
  • Cloud-based deployments and monitoring
  • Hybrid cloud environments

Microsoft Infrastructure Experience with:
  • Windows Server
  • IIS deployment and configuration
  • Enterprise application hosting and deployment support

Preferred Qualifications:
  • Experience supporting Mainframe modernization initiatives involving:
    • COBOL-to-.NET transformation
    • AI-assisted code conversion
    • Functional equivalence validation
    • Legacy application modernization
  • Exposure to Mainframe technologies such as:
    • COBOL
    • JCL
    • CICS
    • VSAM
    • DB2
    • IMS
  • Experience supporting government, financial, healthcare, tax, or other large enterprise modernization programs
  • Experience with automated modernization tools and modernization factory delivery models
  • Exposure to hybrid and multi-cloud enterprise environments

Apply