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Senior Mainframe Developer Jobs in Delaware (NOW HIRING)

Apolis

Sr Mainframe Developer

Wilmington, DE · On-site

* Job Title: Sr. Mainframe Developer Location: Hybrid (Minimum 3 Days Onsite) - Wilmington, DE 19803 Tax Term (W2, C2C): W2 Job Type (Permanent/Contract): Contract Duration: Long Term Open Description:

enexusglobal

Sr Mainframe Developer

Wilmington, DE · On-site

Job title: Sr Mainframe Developer Role is Hybrid (3 days/wk) Client address: 880 Powder Mill Rd Wilmington, DE 19803 Years of experience required: 8+ · Develops and implements solutions that address ...

New

Judge Group, Inc.

Sr Mainframe Developer

Wilmington, DE · On-site

$50.50/hr

Our client is currently seeking a Sr Mainframe Developer Develops and implements solutions that address complex business challenges, enhancing the ability to make data-driven decisions and improving ...

Judge Group, Inc.

Sr Mainframe Developer

Wilmington, DE · On-site

$50.50/hr

Our client is currently seeking a Sr Mainframe Developer Years of experience required: 8+ Develops and implements solutions that address complex business challenges, enhancing the ability to make ...

Keylent

Mainframe Developer

Wilmington, DE · On-site

$47.50 - $61/hr

Role: Sr Mainframe Developer Location: Wilmington, DE Years of experience required: 8+ · Develops and implements solutions that address complex business challenges, enhancing the ability to make ...

Divit Technologies, Inc.

Mainframe Engineer

Wilmington, DE · On-site

$47.50 - $61/hr

We are currently hiring for a Senior Mainframe Engineer for a hybrid opportunity in Dallas, TX for full time. Job title : Mainframe Engineer Interview : 2 rounds of Interview Work Mode : 5 DAYS Work ...

Keylent

Sr Mainframe Developer

Wilmington, DE · On-site

Job Requirements: · Candidate should have expertise in COBOL, JCL, VSAM, IMS, CICS & DB2. · Expertise in CICS Programming including knowledge of CICS Screen Programming is Mandatory · Experience ...

TekCommands Inc

Sr Mainframe Developer

Wilmington, DE · On-site

... Programming including knowledge of CICS Screen Programming is Mandatory · Experience/Knowledge in building and maintaining new Test regions is preferred. · Experience coding in MQ Series & IMS DB ...

Galent

Senior Mainframe Application Developer

Wilmington, DE · On-site

$47.50 - $61/hr

Senior Mainframe Application Developer Location: Wilmington, DE (Onsite) Job Details: Contract Mandatory Skills - IBM-Z/OS COBOL, CICS, DB2, IBM MQ, VSAM, JCL, CA7, Changeman and IBM Mainframe ...

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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 11, 2026, the average hourly pay for senior mainframe developer in Delaware is $57.70, according to ZipRecruiter salary data. Most workers in this role earn between $54.13 and $63.03 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.
What are the most commonly searched types of Mainframe Developer jobs in Delaware? The most popular types of Mainframe Developer jobs in Delaware are:
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What job categories do people searching Senior Mainframe Developer jobs in Delaware look for? The top searched job categories for Senior Mainframe Developer jobs in Delaware are:
What cities in Delaware are hiring for Senior Mainframe Developer jobs? Cities in Delaware with the most Senior Mainframe Developer job openings:
What are popular job titles related to Senior Mainframe Developer jobs in DE? For Senior Mainframe Developer jobs in DE, the most frequently searched job titles are:
Senior Mainframe Developer jobs near you
Infographic showing various Senior Mainframe Developer job openings in Delaware as of August 2026, with employment types broken down into 78% Full Time, 7% Part Time, and 15% Contract. Highlights an 80% Physical, 6% Hybrid, and 14% Remote job distribution, with an average salary of $120,019 per year, or $57.7 per hour.

Sr Mainframe Developer

Apolis

Wilmington, DE • On-site

Other

Posted 12 days ago

Job description

  • Job Title:Sr. Mainframe DeveloperLocation:Hybrid (Minimum 3 Days Onsite) – Wilmington, DE 19803Tax Term (W2, C2C):W2Job Type (Permanent/Contract):ContractDuration:Long TermOpenDescription:

    We are seeking an experienced Sr. Mainframe Developer with 10–16 years of experience to design, develop, and maintain enterprise banking applications. The ideal candidate should have strong hands-on development experience in Mainframe technologies, expertise in CICS programming, and experience working on complex banking systems.

    Role and Responsibilities:
  • Develops and implements solutions that address complex business challenges, enhancing the ability to make data-driven decisions and improving operational efficiency.
  • Prepares architecture and design documents for complex Banking applications keeping in mind design constraints that translate to coding.
  • Develops secure and high-quality code that runs in sync with other highly efficient sub systems.
  • Think out-of-the-box proactively and be creative by challenging conventional approaches and contribute towards operational efficiency.
  • Troubleshoots problems, works with Product Teams and other stake holders to understand complex Requirements and be able to break them down to design/development.
  • Candidate should have expertise in COBOL, JCL, VSAM, IMS, CICS & DB2.
  • Expertise in CICS Programming including knowledge of CICS Screen Programming is Mandatory.
  • Experience/Knowledge in building and maintaining new Test regions is preferred.
  • Experience coding in MQ Series & IMS DB is Mandatory.
  • Experience in Banking Compliance and Regulatory Platform is preferred.
  • Must have hands-on coding development experience.
  • Experience with version control.
  • Ability to communicate effectively with team members and clients and excellent problem-solving skills.
  • Required Skills:
  • COBOL
  • JCL
  • VSAM
  • IMS
  • IMS DB
  • CICS
  • CICS Screen Programming
  • DB2
  • MQ Series (IBM MQ)
  • Mainframe Development
  • Banking Applications
  • Banking Compliance & Regulatory Platform
  • Test Region Setup & Maintenance
  • Version Control
  • Architecture & Design
  • Troubleshooting
  • Hands-on Coding
  • Excellent Communication Skills
  • Qualifications:
  • 10–16 years of experience in Mainframe Development.
  • Strong hands-on development experience in COBOL, JCL, VSAM, IMS, CICS, and DB2.
  • Mandatory experience with CICS Programming and CICS Screen Programming.
  • Mandatory experience with MQ Series and IMS DB.
  • Experience building and maintaining test regions is preferred.
  • Experience in Banking Compliance and Regulatory platforms is preferred.
  • Strong problem-solving, analytical, and communication skills.
  • Ability to work in a hybrid environment with a minimum of 3 days onsite.

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