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Senior Mainframe Developer Jobs in Washington (NOW HIRING)

System One

Java Mainframe Developer

Vienna, VA · Remote

$58.50 - $74.75/hr

Java Developer Location: Remote Type: Contract Responsibilities * Design, develop, and enhance complex software applications supporting mission-critical, time-sensitive initiatives focused on ...

System One

Java Mainframe Developer

Vienna, VA · Remote

$58.50 - $74.75/hr

Java Developer Location: Remote Type: Contract Responsibilities * Design, develop, and enhance complex software applications supporting mission-critical, time-sensitive initiatives focused on ...

System One

Java Mainframe Developer

Vienna, VA · Remote

$58.50 - $74.75/hr

Java Developer Location: Remote Type: Contract Responsibilities * Design, develop, and enhance complex software applications supporting mission-critical, time-sensitive initiatives focused on ...

System One

Java Mainframe Developer

Vienna, VA · Remote

$58.50 - $74.75/hr

Java Developer Location: Remote Type: Contract Responsibilities * Design, develop, and enhance complex software applications supporting mission-critical, time-sensitive initiatives focused on ...

System One

Java Mainframe Developer

Vienna, VA · Remote

$58.50 - $74.75/hr

Java Developer Location: Remote Type: Contract Responsibilities * Design, develop, and enhance complex software applications supporting mission-critical, time-sensitive initiatives focused on ...

Creative G C

Mainframe z/OS System Programmer

Columbia, MD · Remote

$56.25 - $71.75/hr

As an US Citizen and as a Senior System Programmer (Mainframe) supporting IBM z15 and z16 mainframe and z/OS 2.5 or higher operating system. As part of IBM zCloud resource pool, supporting the zCloud ...

Accenture

Mainframe Specialist

Herndon, VA · On-site

$70K - $196K/yr

Partner with cross-functional teams-architects, developers, QA, and business analysts-to gather ... Collaborate with senior leadership to secure executive sponsorship and organizational buy-in for ...

Serigor, Inc.

Senior .NET Developer (Onsite)

Columbia, MD · On-site

$53.75 - $70.75/hr

Job Title: Senior .NET Developer (Onsite) Location: Columbia, MD Job Type: Full-Time * We are ... Experience supporting Mainframe modernization, automated code conversion, and enterprise ...

Avance Consulting Services

MainFrame

Mclean, VA

My name is Ahmed and I am a Sr. Technical Recruiter with Avance Consulting. We are a leading ... It provides strategic business consulting, technology, engineering and outsourcing services to help ...

TheStaffed

Sr DataStage Engineer

Mclean, VA · On-site

Our client is seeking a Senior DataStage Engineer to design, develop, and maintain enterprise ETL ... Modernize legacy mainframe batch processes by translating existing COBOL/JCL logic into DataStage ...

Resource Point LLC

Java Full Stack Developer Senior

Reston, VA · On-site

$54.50 - $70.50/hr

The legacy mainframe application is used for non-performing loans and will be replaced with multiple applications for specific functions. Requirements * Project requires a Senior Full Stack Developer ...

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 ...

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 ...

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 ...

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Senior Mainframe Developer information

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$75

How much do senior mainframe developer jobs pay per hour?

As of Sep 2, 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 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 are the most commonly searched types of Mainframe Developer jobs in Washington?

The most popular types of Mainframe Developer jobs in Washington are:

What are popular job titles related to Senior Mainframe Developer jobs in Washington?

For Senior Mainframe Developer jobs in Washington, the most frequently searched job titles are:

What job categories do people searching Senior Mainframe Developer jobs in Washington look for?

The top searched job categories for Senior Mainframe Developer jobs in Washington are:

What cities in Washington are hiring for Senior Mainframe Developer jobs?

Cities in Washington with the most Senior Mainframe Developer job openings:

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For Senior Mainframe Developer jobs in WA, the most frequently searched job titles are:

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 83% Full Time, 4% Part Time, and 13% Contract. Highlights an 82% Physical, 4% Hybrid, and 14% Remote job distribution, with an average salary of $135,817 per year, or $65.3 per hour.

Java Mainframe Developer

System One

Vienna, VA • Remote

$58.50 - $74.75/hr

Contractor

Medical, Dental, Vision, Life, Retirement

Re-posted 17 days ago

Job description

Job Title: Java Developer Location: Remote Type: Contract

Responsibilities

  • Design, develop, and enhance complex software applications supporting mission-critical, time-sensitive initiatives focused on integrating distributed applications with the organization's Core Banking platform.
  • Translate business and platform requirements into secure, scalable, and reliable solutions throughout the full software development lifecycle.
  • Operate with minimal supervision while exercising strong technical judgment.
  • Collaborate with Core Banking, testing, middleware, and platform teams to manage dependencies, mitigate risks, and meet aggressive delivery timelines.
  • Design, develop, and optimize high-quality software applications using advanced programming languages and frameworks that meet business needs.
  • Gather and analyze requirements, translate into technical specifications, propose solutions, and ensure timely task completion.
  • Write clean, scalable, and maintainable code adhering to best practices and organizational standards.
  • Implement data structures and algorithms efficiently to optimize performance and user experience.
  • Identify, troubleshoot, and resolve application errors.
  • Conduct code reviews, provide feedback, and learn from colleagues to maintain high-quality codebase.
  • Lead small efforts, fostering relationships with stakeholders and team members.
  • Contribute to development policies, standards, and procedures for applications and software.
  • Continuously learn and improve through collaboration and feedback.
Requirements
  • Bachelor’s degree in Computer Science, Information Systems, or a related field, or equivalent experience.
  • 0 or more years of experience in application or software development.
  • Proficiency in software development principles, methodologies (including Agile), pipelines, and version control systems (Git and GitHub).
  • Expertise in Java, XML, Open API, Maven, and ANT, with knowledge of modern frameworks and libraries.
  • Strong understanding of web technologies and capacity to design scalable solutions.
  • Excellent problem-solving, analytical, and troubleshooting skills.
  • Effective written and verbal communication skills for technical and non-technical stakeholders.
  • Experience with incident tracking, project management, and change control tools.
  • Understanding of data structures and algorithms for application performance and scalability.
  • Experience developing web services, microservices, REST and SOAP APIs, and implementing REST principles.
  • Ability to write and maintain unit and integration tests and troubleshoot software defects.
  • Familiarity with CI/CD pipelines and web APIs like Apache HTTP Client, JAX-WS, JAX-RS.

System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.

System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.

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About System One

Sourced by ZipRecruiter

System One helps employers get work done more efficiently and economically without compromising quality. Over our 35+ year history, we've helped connect thousands of talented people with innovative companies. The excitement of a perfect fit motivates us every single day.

Industry

Business consulting services and recruiting and staffing services

Company size

5,001 - 10,000 Employees

Headquarters location

Pittsburgh, PA, US

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