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Senior Mainframe Developer Jobs in Dayton, MD (NOW HIRING)

3B Staffing LLC

Sr. Mainframe Developer

Mclean, VA

$58 - $60/hr

Sr. Mainframe Developer in McLean VA Client: Capco/Freddie Mac Location: Fully onsite in McLean, VA Visa: Any Rate: $58-$60/hr 6- Months Contract Interview process: 2 Teams calls, final onsite Must ...

3B Staffing LLC

Sr. Mainframe Developer

Mclean, VA

$58 - $60/hr

Sr. Mainframe Developer in McLean VA Client: Capco/Freddie Mac Location: Fully onsite in McLean, VA Visa: Any Rate: $58-$60/hr 6- Months Contract Interview process: 2 Teams calls, final onsite Must ...

JS Consulting

Sr. Mainframe Developer

Woodlawn, MD · On-site

$51 - $65.50/hr

Job Title- Sr. Mainframe Developer Project Location - Woodlawn, MD (5 days per week onsite) Duration- 6+ months contract Skills: Strong experience with IBM z/OS (OS/390/MVS) environment developing ...

System One

Senior Mainframe Engineer

Merrifield, VA · Remote

Senior Mainframe Engineer Location: remote Pay rate: open to W2 and established 1099s Position type: multiyear contract We are currently seeking a Senior Mainframe Programmer/Support Analyst with a ...

TekCommands Inc

Sr Mainframe Developer / Support

Mclean, VA · On-site

$49.50 - $63.75/hr

Experience in mainframe systems Experience in Application Support Strong communication skills A minimum 8 - 10 years of systems analysis/application development experience Background in development ...

3B Staffing LLC

Mainframe Developer/Engineer

Reston, VA · Hybrid

$51 - $65.50/hr

Senior Software Engineer with a strong Mainframe background to support core enrollment systems that power employee healthcare programs and enrollment data processing. This is a backfill opportunity ...

3B Staffing LLC

Mainframe Developer/Engineer

Reston, VA · Hybrid

$51 - $65.50/hr

Senior Software Engineer with a strong Mainframe background to support core enrollment systems that power employee healthcare programs and enrollment data processing. This is a backfill opportunity ...

Navy Federal Credit Union

Senior Mainframe Engineer

Vienna, VA · On-site

$123K - $162K/yr

Experience with SMP/E maintenance and z/OS system programming concepts. * Familiarity with Ansible, REST APIs, and mainframe modernization technologies Additional Information Hours: * Monday - Friday ...

System One

.NET Mainframe Developer

Vienna, VA · Remote

$50.25 - $64.50/hr

Serve as a senior technical contributor responsible for translating business and platform ... Expertise in programming languages / standards / build tools including Java, XML, Open API, Maven ...

System One

.NET Mainframe Developer

Vienna, VA · Remote

$50.25 - $64.50/hr

Serve as a senior technical contributor responsible for translating business and platform ... Expertise in programming languages / standards / build tools including Java, XML, Open API, Maven ...

System One

.NET Mainframe Developer

Vienna, VA · Remote

$50.25 - $64.50/hr

Serve as a senior technical contributor responsible for translating business and platform ... Expertise in programming languages / standards / build tools including Java, XML, Open API, Maven ...

System One

.NET Mainframe Developer

Vienna, VA · Remote

$50.25 - $64.50/hr

Serve as a senior technical contributor responsible for translating business and platform ... Expertise in programming languages / standards / build tools including Java, XML, Open API, Maven ...

System One

.NET Mainframe Developer

Vienna, VA · Remote

$50.25 - $64.50/hr

Serve as a senior technical contributor responsible for translating business and platform ... Expertise in programming languages / standards / build tools including Java, XML, Open API, Maven ...

System One

.NET Mainframe Developer

Vienna, VA · Remote

$50.25 - $64.50/hr

Serve as a senior technical contributor responsible for translating business and platform ... Expertise in programming languages / standards / build tools including Java, XML, Open API, Maven ...

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Senior Mainframe Developer information

See Dayton, MD salary details

$37

$56

$64

How much do senior mainframe developer jobs pay per hour?

As of Sep 5, 2026, the average hourly pay for senior mainframe developer in Dayton, MD is $56.16, according to ZipRecruiter salary data. Most workers in this role earn between $52.69 and $61.35 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 cities near Dayton, MD are hiring for Senior Mainframe Developer jobs?

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

Senior Mainframe Developer jobs near you
Infographic showing various Senior Mainframe Developer job openings in Dayton, MD as of August 2026, with employment types broken down into 79% Full Time, 3% Part Time, and 18% Contract. Highlights an 80% Physical, 6% Hybrid, and 14% Remote job distribution, with an average salary of $116,808 per year, or $56.2 per hour.

Sr. Mainframe Developer

3B Staffing LLC

Mclean, VA

$58 - $60/hr

Contractor

Posted 24 days ago

Job description

Sr. Mainframe Developer in McLean VA

Client: Capco/Freddie Mac

Location: Fully onsite in McLean, VA

Visa: Any

Rate: $58-$60/hr

6- Months Contract

Interview process: 2 Teams calls, final onsite

Must include Linkedin and have Mortgage Industry experience

Previous Freddie Mac or Fannie Mae experience is a big plus.

Key Responsibilities:

  • Design, develop, and maintain mainframe applications.
  • Perform data analysis and troubleshooting to support business needs.
  • Collaborate with cross-functional teams to deliver high-quality solutions.
  • Work with DataStage ETL processes if applicable.

Qualifications:

  • Proven experience as a Mainframe Development with Cobol and JCL
  • Strong data analysis skills.
  • Experience with DataStage.
  • Experience with Fannie Mae/Freddie Mac systems or mortgage/financial industry.
  • Strong problem-solving and communication skills.

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