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Senior Mainframe Developer Jobs in Washington (NOW HIRING)

System One

Senior Application Engineer

Vienna, VA · Remote

Senior Application Engineer Location: Remote Pay Rate: Open to Both C2C and W2 options Position ... Expertise in mainframe programming languages and development tools such as JCL, COBOL, DB2 and IBM ...

System One

Senior Application Engineer

Vienna, VA · Remote

Senior Application Engineer Location: Remote Pay Rate: Open to Both C2C and W2 options Position ... Expertise in mainframe programming languages and development tools such as JCL, COBOL, DB2 and IBM ...

Omega Solutions Inc

Senior Security

Washington, DC · On-site

$90/hr

Senior Security Washington, District Of Columbia 4/12/2021 to 10/12/2021 Client: CareFirst Client ... Engineering & Development. The candidate will be responsible to create new roles in Mainframe and ...

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 · 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 ...

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 ...

USM

Sr Java Developer

Washington, DC

$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 ...

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Senior Mainframe Developer information

See Washington salary details

$43

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How much do senior mainframe developer jobs pay per hour?

As of Aug 12, 2026, the average hourly pay for senior mainframe developer in Washington is $65.30, according to ZipRecruiter salary data. Most workers in this role earn between $61.25 and $71.35 per hour, depending on experience, location, and employer.

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 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 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.
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Senior Mainframe Developer jobs near you
Infographic showing various Senior Mainframe Developer job openings in Washington as of August 2026, with employment types broken down into 79% Full Time, 7% Part Time, and 14% Contract. Highlights an 80% Physical, 6% Hybrid, and 14% Remote job distribution, with an average salary of $135,817 per year, or $65.3 per hour.

Senior Application Engineer

System One

Vienna, VA • Remote

Contractor

Re-posted 13 days ago

Job description

Job Title: Senior Application Engineer Location: Remote Pay Rate: Open to Both C2C and W2 options Position Type: Multiyear Contract Description Design, develop, and optimize software applications that bridge technical teams and end-users, addressing business needs through innovative solutions and enhancing member or internal user experiences. Leverage the full software development lifecycle, including design, coding, testing, and deployment on an Agile Release Train, to ensure efficient system improvements. Work under minimal supervision and use complete understanding of business needs and objectives to support projects that have impact on the achievement of operational goals. Advanced skill set and proficiency with procedures and techniques. Responsibilities • Research and analysis of the existing CACS application and the known, documented interfaces • Identification of required changes needed for integration with downstream applications • Architecture and design documentation for the proposed processing • Engineering the technical solution, migration to the Integration environment for quality testing, and resolution of identified bugs • Debt Sale execution and validation with the possibility for some engineering work. • Design, develop, and optimize high-quality software applications using various, advanced programming languages and frameworks that meet business requirements • Collaborate with engineers, stakeholders, and team members to gather and analyze requirements and translate them into technical specifications, propose innovative solutions, and ensure timely task completion • Write advanced, clean, scalable, and maintainable code that adheres to industry best practices and organizational coding standards • Implement data structures and algorithms efficiently, optimizing code for performance, scalability, and user experience • Identify, troubleshoot, and resolve advanced application functionality, performance, and bugs, ensuring quality and system improvements • Conduct advanced and team code reviews, provide constructive feedback, and learn from colleagues' expertise to maintain a high-quality codebase • Lead small projects and initiatives, while building strong working relationships with stakeholders, team members and subject matter experts, driving collective success and continuous improvement • Contribute to generating and adhering to application and software development engineering policies, standards, and procedures • Continuously learn from individual and team experiences, fostering growth and improvement through collaboration and continuous feedback Qualifications • Bachelors Degree in Computer Science, Information Systems, a related field or the equivalent combination of education, training or experience • 10+ years of experience in application or software development engineering • Prefer knowledge and understanding of Collections business processes • Advanced proficiency in software development principles, the SAFe/Agile methodology, and version control systems • Expertise in mainframe programming languages and development tools such as JCL, COBOL, DB2 and IBM mainframe utilities (Syncsort, DFSort, ICETOOL) on z/OS. Client leverages Changeman ZMF for change management and ESP for job scheduling • Deep understanding of database structures, web technologies, and technical applications, capable of designing and implementing scalable solutions • Strong problem-solving, analytical, and troubleshooting skills, with the ability to address complex technical issues efficiently • Advanced written and verbal communication skills for articulating technical concepts to both technical and non-technical stakeholders • Experience in software testing, quality assurance, and optimizing code for performance, scalability, and maintainability • Advanced knowledge of customer support tools, ticketing systems, and knowledge base platforms for effective resolution of technical issues • Expertise in data structures, algorithms, and applying them for optimal application performance and scalability • Ability to lead projects, mentor team members, and contribute to the development of engineering policies, standards, and procedures Ref: #851-Rockville-S1