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Senior Mainframe Developer Jobs in Gaithersburg, MD

TechWish

Senior Java Developer

Sterling, VA · On-site

$57 - $72.50/hr

Job Summary : TechWish is seeking a Senior Java Developer to design and develop software ... mainframes that queries and retrieves data using SQL, JNDI, JDBC template and through Object ...

Peraton

Senior Software Test Engineer

Lanham, MD · Hybrid

$110K - $143K/yr

Responsibilities Peraton is seeking a Senior Software Test Engineer to join our team of qualified ... Conduct functional and/or integration testing of multiple programs in an IBM mainframe, client ...

Peraton

Senior Software Test Engineer

Lanham, MD · On-site

$80 - $128/hr

Responsibilities Peraton is seeking a Senior Software Test Engineer to join our team of qualified ... Conduct functional and/or integration testing of multiple programs in an IBM mainframe, client ...

Peraton

Senior Software Test Engineer

Lanham, MD · Hybrid

$110K - $143K/yr

Responsibilities Peraton is seeking a Senior Software Test Engineer to join our team of qualified ... Conduct functional and/or integration testing of multiple programs in an IBM mainframe, client ...

Peraton

Senior Software Test Engineer

Lanham, MD · On-site

$80K - $128K/yr

Responsibilities Peraton is seeking a Senior Software Test Engineer to join our team of qualified ... Conduct functional and/or integration testing of multiple programs in an IBM mainframe, client ...

USM

Sr Java Developer

Washington, DC · On-site

$64.75 - $82.75/hr

Position title: Sr Java Developer Location: Washington, DC (Need Local Only) Duration: 6 Months ... At least 8 years of mainframe-based application development experience Demonstrated knowledge of ...

AHU Technologies Inc

Sr Java Developer

Washington, DC · On-site

$80 - $85/hr

TITLE: Sr Java Developer LOCATION: Washington, DC/ Onsite Employment type: Contract w2/1099/C2C ... Desired 1 Year · Working with mainframe CICS containers and channels using JCA connectors. Desired ...

AHU Technologies, Inc.

Sr Java Developer

Washington, DC · On-site

$80 - $85/hr

TITLE: Sr Java Developer LOCATION: Washington, DC/ Onsite Employment type: Contract w2/1099/C2C ... Desired 1 Year • Working with mainframe CICS containers and channels using JCA connectors.

Peraton

Senior Test Automation Engineer

Lanham, MD · On-site

$80K - $128K/yr

Design, develop, and maintain automated test frameworks and scripts for mainframe and web ... DevOps, and product owners to ensure automation aligns with release goals * Provide guidance and ...

Peraton

Senior Test Automation Engineer

Lanham, MD

$80K - $128K/yr

Design, develop, and maintain automated test frameworks and scripts for mainframe and web ... DevOps, and product owners to ensure automation aligns with release goals * Provide guidance and ...

Peraton

Senior Test Automation Engineer

Lanham, MD · On-site

$80 - $128/hr

Design, develop, and maintain automated test frameworks and scripts for mainframe and web ... DevOps, and product owners to ensure automation aligns with release goals * Provide guidance and ...

Peraton

Senior Test Automation Engineer

Lanham, MD · On-site

$80K - $128K/yr

Design, develop, and maintain automated test frameworks and scripts for mainframe and web ... DevOps, and product owners to ensure automation aligns with release goals * Provide guidance and ...

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Senior Mainframe Developer information

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How much do senior mainframe developer jobs pay per hour?

As of Aug 22, 2026, the average hourly pay for senior mainframe developer in Gaithersburg, MD is $62.29, according to ZipRecruiter salary data. Most workers in this role earn between $58.46 and $68.03 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 job categories do people searching Senior Mainframe Developer jobs in Gaithersburg, MD look for?

The top searched job categories for Senior Mainframe Developer jobs in Gaithersburg, MD are:

What cities near Gaithersburg, MD are hiring for Senior Mainframe Developer jobs?

Cities near Gaithersburg, MD with the most Senior Mainframe Developer job openings:

Senior Mainframe Developer jobs near you
Infographic showing various Senior Mainframe Developer job openings in Gaithersburg, MD as of August 2026, with employment types broken down into 80% Full Time, 5% Part Time, and 15% Contract. Highlights an 82% Physical, 6% Hybrid, and 12% Remote job distribution, with an average salary of $129,564 per year, or $62.3 per hour.

Senior Datastage Engineer_ McLean, VA (IN-PERSON INTERVIEW MUST)

Svam International, Inc.

Mclean, VA • On-site

Other

Posted 2 days ago

New

Job description

 

Senior Datastage Engineer

Location: McLean, VA

Onsite Position from Day 1

Long term Contract

Client is seeking an experienced Senior Datastage Engineer with deep expertise in IBM DataStage, PySpark, and Mainframe technologies to join a high-performing client delivery team in McLean, VA. In this hands-on contract role, you will design, develop, and modernize enterprise ETL solutions, helping transform legacy batch processes into scalable, high-performance data pipelines.

Working closely with business and technology stakeholders, you''ll play a key role in modernizing critical data assets while ensuring quality, reliability, and performance across the data ecosystem. This role requires on-site engagement in McLean, VA.

 

What You''ll Do

  • Design, develop, and maintain enterprise ETL solutions using IBM DataStage, integrating data across multiple platforms and applications.
  • Modernize legacy mainframe batch processes (including COBOL, JCL, and VSAM) by translating existing logic into efficient DataStage jobs and supporting migration toward modern data platforms.
  • Develop and optimize PySpark-based data processing solutions to support large-scale data transformation and modernization initiatives.
  • Collaborate with business analysts, architects, and engineering teams to deliver robust, scalable, and well-documented data solutions.
  • Troubleshoot production issues, optimize ETL performance, and ensure high standards for data quality, reliability, and operational support.

 

What We''re Looking For

  • Extensive experience developing enterprise ETL solutions using IBM DataStage with strong hands-on expertise in PySpark and Mainframe technologies (COBOL, JCL, VSAM).
  • Proven experience designing complex ETL workflows, data integration solutions, and batch processing frameworks within enterprise environments.
  • Strong understanding of modern cloud data platforms and data engineering concepts, including Snowflake, AWS, and data migration strategies.
  • Experience working throughout the software development lifecycle, including requirements analysis, development, testing, deployment, and production support.
  • Excellent communication, documentation, and stakeholder collaboration skills with the ability to work effectively in client-facing consulting environments.

Apply