Senior Mainframe Engineer

Accellor, Inc; Michigan; On-site; USD 90,000 - 120,000; Full time

Job summary

Accellor, Inc is seeking a Senior Mainframe Developer to build, maintain, and modernize critical applications for the financial services industry. In this role, you will design and develop COBOL applications on IBM Mainframe platforms and collaborate with engineers and business stakeholders.

The ideal candidate will have over 8 years of experience with IBM Mainframe technology, strong problem-solving skills, and a background in the Software Development Life Cycle. This position offers opportunities to work on high-volume transaction processing.

Qualifications

• 8+ years of IBM Mainframe development experience.
• Strong analytical and problem‑solving skills.
• Experience working within the Software Development Life Cycle (SDLC).

Responsibilities

• Design, develop, test, and maintain enterprise COBOL applications on IBM Mainframe platforms.
• Develop and enhance batch and online transaction processing systems.
• Troubleshoot production issues and provide ongoing application support.

Skills

COBOL

JCL

CICS

DB2

VSAM

Job description

We're looking for an Senior Mainframe Developer to join our team and help build, maintain, and modernize mission-critical applications supporting the financial services industry.

If you enjoy solving complex technical challenges, working with large-scale enterprise systems, and delivering reliable, high-performing software, we'd love to hear from you.

In this role, you'll collaborate with architects, business stakeholders, and engineering teams to develop and support high-volume transaction processing systems that are essential to daily business operations.

What You'll Do

• Design, develop, test, and maintain enterprise COBOL applications on IBM Mainframe platforms.
• Develop and enhance batch and online transaction processing systems.
• Analyze business and technical requirements to deliver scalable, reliable solutions.
• Troubleshoot production issues and provide ongoing application support.
• Optimize application performance and improve system stability.
• Participate in code reviews and contribute to development best practices.
• Collaborate with cross‑functional teams throughout the software development lifecycle.
• Support modernization initiatives and integration with newer technologies while maintaining critical legacy systems.
• Create and maintain technical documentation.

Qualifications

• 8+ years of IBM Mainframe development experience.
• Strong hands‑on experience with:
• COBOL
• JCL
• CICS
• DB2
• VSAM
• Experience supporting enterprise‑scale production applications.
• Strong analytical and problem‑solving skills.
• Experience working within the Software Development Life Cycle (SDLC).
• Excellent communication and collaboration skills.

Preferred Qualifications

• Experience within the Banking, Financial Services, or Insurance (BFSI) industry.
• Knowledge of financial transaction processing systems.
• Experience with IBM z/OS.
• Familiarity with tools such as File‑AID, Abend‑AID, Expeditor, Endevor, or Changeman.
• Experience integrating mainframe applications with distributed systems or APIs.
• Exposure to Agile development methodologies.
• Experience supporting modernization or digital transformation initiatives.