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Mainframes Developer Jobs in Ashburn, VA (NOW HIRING)

System One Holdings, LLC

.NET Mainframe Developer

Vienna, VA · On-site

$49.25 - $63.25/hr

Job Title: .NET Developer Location: Remote Type: Contract Contractor Work Model: Remote Responsibilities * Design, develop, and enhance complex software applications supporting mission-critical, time ...

Capital One

Mainframe Security Engineer

Mclean, VA

Mainframe Security Engineer Do you love building and pioneering in the technology space? Do you enjoy solving complex business problems in a fast-paced, collaborative, inclusive, and iterative ...

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 ...

Capital One

Mainframe Security Engineer

Mclean, VA · On-site

Mainframe Security Engineer Do you love building and pioneering in the technology space? Do you enjoy solving complex business problems in a fast-paced, collaborative, inclusive, and iterative ...

Avance Consulting Services

MainFrame

Mclean, VA · On-site

It provides strategic business consulting, technology, engineering and outsourcing services to help ... Qualifications MainFrames,Cobol,JCL,ISPW Additional Information All your information will be kept ...

E Logic

IT Software Developer III

Washington, DC · On-site

$95K/yr

E-Logic is seeking a highly skilled IT Software Developer III to support the Internal Revenue ... Mainframe development environments * Batch processing systems * Experience with: * CMPlus * IPF

System One Holdings, LLC

Java Mainframe Developer

Vienna, VA · On-site

$57.50 - $73.25/hr

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

TekWissen

DB2 Consultant

Bethesda, MD

... engineering, and systems integration. www.tekwissen.com Should be able to Designs, develops and supports application solutions with focus on mainframe DB2 applications including ability to query DB2 ...

Stem Xpert

Mainframe Tester

Mclean, VA

... engineering and systems integration. Our tightly integrated offerings are tailored to each clients ... Title: Mainframe Tester Location: Mclean VA and Alpharetta, GA No of Positions: 2 Position type:

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All JobsMainframes Developer JobsMainframes Developer Jobs in Ashburn, VA

Mainframes Developer information

See Ashburn, VA salary details

$49.1K

$114.4K

$169.8K

How much do mainframes developer jobs pay per year?

As of Jun 11, 2026, the average yearly pay for mainframes developer in Ashburn, VA is $114,373.00, according to ZipRecruiter salary data. Most workers in this role earn between $92,000.00 and $132,900.00 per year, depending on experience, location, and employer.

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 may also handle system updates, performance tuning, and integration with other systems.

What is mainframe developer salary?

The salary for a mainframe developer typically ranges from $70,000 to $120,000 annually, depending on experience, location, and certifications. Senior roles or those with specialized skills in COBOL, JCL, or mainframe environments may earn higher compensation. Many positions also offer benefits such as health insurance and retirement plans.

Can mainframe be replaced by AI?

Mainframes are large-scale computing systems used for critical enterprise applications, and while AI can automate certain tasks and improve efficiency, it does not replace the core functions of mainframes. Mainframe developers often work with legacy systems, COBOL programming, and security protocols, which require specialized skills that are not fully replaced by AI technologies.

Is mainframe still in demand?

Mainframes remain in demand for large enterprises such as banks, insurance companies, and government agencies that rely on their reliability, security, and processing power. Mainframe developers with skills in COBOL, JCL, and mainframe environments are sought after to maintain and upgrade legacy systems, though the overall demand has decreased as organizations adopt cloud and distributed computing. Certification and experience with mainframe tools can enhance job prospects in this specialized field.

What is the difference between Mainframes Developer vs Mainframes Analyst?

AspectMainframes DeveloperMainframes Analyst
Required CredentialsTypically a degree in Computer Science or related field; certifications like IBM Certified SpecialistSimilar credentials; often holds certifications in mainframe systems and analysis
Work EnvironmentDevelops, codes, and tests mainframe applications in a software development settingAnalyzes existing mainframe systems, gathers requirements, and supports system improvements
Employer & Industry UsageUsed by banks, insurance companies, and large enterprises for application developmentEmployed in similar industries for system analysis, troubleshooting, and process optimization

While both roles require knowledge of mainframe systems and similar credentials, Mainframes Developers focus on creating and maintaining mainframe applications, whereas Mainframes Analysts analyze existing systems to improve performance and efficiency. Both roles are vital in large enterprise IT environments.

What are popular job titles related to Mainframes Developer jobs in Ashburn, VA? For Mainframes Developer jobs in Ashburn, VA, the most frequently searched job titles are:
What job categories do people searching Mainframes Developer jobs in Ashburn, VA look for? The top searched job categories for Mainframes Developer jobs in Ashburn, VA are:
What cities near Ashburn, VA are hiring for Mainframes Developer jobs? Cities near Ashburn, VA with the most Mainframes Developer job openings:
Mainframes Developer jobs near you
Infographic showing various Mainframes Developer job openings in Ashburn, VA as of June 2026, with employment types broken down into 21% Full Time, and 79% Contract. Highlights an 92% In-person, and 8% Hybrid job distribution, with an average salary of $114,373 per year, or $55 per hour.
.NET Mainframe Developer

.NET Mainframe Developer

System One Holdings, LLC

Vienna, VA • On-site

$49.25 - $63.25/hr

Contractor

Medical, Dental, Vision, Life, Retirement

This job post has expired today. Applications are no longer accepted.

Job description

Job Title: .NET Developer
Location: Remote
Type: Contract
Contractor Work Model: Remote
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.
  • Serve as a senior technical contributor responsible for translating business and platform requirements into secure, scalable, and reliable solutions across 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 risk, and meet aggressive delivery timelines.
  • Design, develop, and optimize high-quality software applications using various, advanced programming languages and frameworks that meet business requirements.
  • Collaborate with stakeholders and team members to gather and analyze requirements, translate requirements into technical specifications, propose innovative solutions, and ensure timely task completion.
  • Write 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 errors in application function.
  • Conduct team code reviews, provide constructive feedback, and learn from colleagues' expertise to maintain a high-quality codebase.
  • Lead small efforts, while building strong working relationships with stakeholders, team members, and subject matter experts.
  • Contribute to generating and adhering to application and software development policies, standards, and procedures.
  • Continuously learn from individual and team experiences, fostering growth and improvement through collaboration and continuous feedback.
Requirements
  • Bachelor's degree in Computer Science, Information Systems, or related field, or the equivalent combination of education, training, or experience.
  • 5-7 years of experience in application or software development.
  • Advanced proficiency in software development principles, methodologies (including Agile), pipelines, and version control systems (Git and GitHub).
  • Expertise in programming languages / standards / build tools including Java, XML, Open API, Maven, and ANT, with strong knowledge of modern frameworks and libraries.
  • Deep understanding of 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 using incident tracking, project management, and change control software tooling.
  • Expertise in data structures, algorithms, and applying them in the design and build of applications for optimal performance and scalability.
  • Demonstrated experience with application development (web, desktop, or mobile) using C#, ASP.NET, and the Microsoft technology stack.
  • Experience writing and maintaining unit and integration tests; troubleshooting and resolving software defects.
  • Experience integrating data storage solutions (like SQL Server) and third-party APIs into application architectures.
  • Familiarity with ASP.NET Core, MVC, and the broader .NET ecosystem (.NET 4.x or .NET 6/8+).
  • Experience developing web services, microservices, RESTful APIs, and designing implementing common patterns and REST principles.
  • Knowledge of Continuous Integration & Delivery (CI/CD) pipelines and tools.

Available for a 12-month contract, providing an excellent opportunity to work on mission-critical projects within a dynamic team environment.
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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