Mainframe Developer

Holistic Partners, Inc; Dallas (TX); Hybrid; USD 120,000 - 180,000; Full time

Job summary

Holistic Partners, Inc. is seeking a Senior Full Stack Mainframe Engineer to support CAM applications by developing, maintaining, and modernizing enterprise mainframe solutions.

You will work closely with distributed teams to ensure platform stability and cloud-native integration, combining deep mainframe expertise with modern tech stacks. The role involves hands-on work across legacy and distributed systems, collaboration on API integration, and ongoing modernization initiatives, including

Qualifications

• 8+ years of enterprise Mainframe development experience.
• Strong expertise in COBOL, JCL, CICS, DB2 (Native SQL and COBOL Stored Procedures), VSAM, and Syncsort.
• Experience supporting high-volume, mission-critical production systems.
• Strong troubleshooting, analytical, and problem-solving skills.
• Experience working in Agile development environments.

Responsibilities

• Design, develop, maintain, and enhance enterprise mainframe applications supporting critical business functions.
• Develop and support applications using COBOL, JCL, CICS, DB2, VSAM, and Syncsort.
• Analyze and resolve complex production issues, perform root cause analysis, and implement long-term solutions.
• Support both batch and online transaction processing while ensuring high availability and operational stability.
• Collaborate with distributed engineering teams developing Java, Spring Boot, REST APIs, and AWS-based applications.
• Participate in application modernization initiatives, API integration, and cloud transformation efforts.
• Perform code reviews, testing, deployment support, and production readiness activities
• Create and maintain technical documentation, operational runbooks, and knowledge transfer materials to reduce key-person dependency
• Partner with engineering teams to continuously improve application performance, reliability, monitoring, and operational excellence

Skills

COBOL

JCL

CICS

DB2

VSAM

Syncsort

Agile

Troubleshooting

Mainframe

REST APIs

Java

Spring Boot

AWS

Tools

Java

Spring Boot

REST APIs

AWS

Postman

Insomnia

CI/CD

Job description

Job Title: Full-stack Mainframe Developer

Location: Remote

Duration: 6-12+ months

IV Process: Video Interview

Remote, with an initial 1st week onsite in Dallas, TX; San Antonio, TX; Raleigh, NC; or Jersey City, NJ.

Job Description

The Senior Full Stack Mainframe Engineer will support critical Customer & Account Management (CAM) applications by developing, maintaining, and modernizing enterprise mainframe solutions. This role partners closely with distributed engineering teams to ensure platform stability, production reliability, and successful integration between legacy mainframe systems and modern cloud-native applications. The ideal candidate is a hands-on engineer with deep mainframe expertise who is comfortable working across both legacy and distributed technologies while supporting ongoing modernization initiatives.

Responsibilities

• Design, develop, maintain, and enhance enterprise mainframe applications supporting critical business functions
• Develop and support applications using COBOL, JCL, CICS, DB2, VSAM, and Syncsort
• Analyze and resolve complex production issues, perform root cause analysis, and implement long-term solutions
• Support both batch and online transaction processing while ensuring high availability and operational stability
• Collaborate with distributed engineering teams developing Java, Spring Boot, REST APIs, and AWS-based applications
• Participate in application modernization initiatives, API integration, and cloud transformation efforts
• Perform code reviews, testing, deployment support, and production readiness activities
• Create and maintain technical documentation, operational runbooks, and knowledge transfer materials to reduce key-person dependency
• Partner with engineering teams to continuously improve application performance, reliability, monitoring, and operational excellence

Required Qualifications

• 8+ years of enterprise Mainframe development experience
• Strong expertise in COBOL, JCL, CICS, DB2 (Native SQL and COBOL Stored Procedures), VSAM, and Syncsort
• Experience supporting high-volume, mission-critical production systems
• Strong troubleshooting, analytical, and problem-solving skills
• Experience working in Agile development environments

Preferred Qualifications

• Working knowledge of Java, Spring Boot, REST APIs, XML, JSON, and AWS
• Experience with API testing tools such as Insomnia or Postman
• Experience integrating mainframe applications with distributed systems
• Familiarity with CI/CD and DevOps practices
• Experience supporting application modernization and cloud migration initiatives
• Excellent communication, collaboration, and documentation skills