Sr. Mainframe Developer (contract

Overview

We are seeking a Senior Mainframe Developer with strong experience in MACSS and IBM z/OS environments to support a mission‑critical platform that is currently single‑threaded across project delivery, operations, and platform modernization work. This role is being added to free up existing FTE capacity and accelerate delivery for the Giga z/OS Connect platform and service build, ensuring stability, scalability, and modernization of core mainframe services.

• Design, develop, and support MACSS‑based and mainframe applications in a complex enterprise environment
• Support project work, production operations, and platform enhancements, reducing reliance on a single SME
• Contribute to the build and expansion of IBM z/OS Connect services, enabling API and microservices integration with distributed platforms
• Partner with platform, infrastructure, and application teams to modernize and expose mainframe services
• Troubleshoot and resolve complex production issues across batch and online processing
• Participate in platform reliability, performance tuning, and operational readiness
• Document systems, processes, and service integrations to reduce operational risk
• Provide mentoring or informal leadership to junior engineers as needed

• 7+ years of mainframe development experience
• Strong hands‑on experience with MACSS (or closely related mainframe transaction/data systems)
• Expertise in COBOL, JCL, CICS, DB2, VSAM
• Experience supporting both application development and production operations
• Familiarity with IBM z/OS Connect (services, APIs, REST enablement)
• Experience working in high‑availability, regulated, or mission‑critical environments
• Strong problem‑solving skills and ability to work independently in a single‑threaded or high‑ownership model

• Direct experience building or scaling z/OS Connect EE services
• Exposure to mainframe modernization initiatives (API enablement, service wrappers, Dev Ops for zOS)
• Experience integrating mainframe services with distributed or cloud platforms
• Knowledge of Git, CI/CD pipelines, or Dev Ops practices for zOS
• Experience in financial services, insurance, or large enterprise platforms

The pay range that the employer in good faith reasonably expects to pay for this position is $59.79/hour - $93.43/hour. Our benefits include medical, dental, vision and retirement benefits.

Applications will be accepted on an ongoing basis. Tundra Technical Solutions is among North America’s leading providers of Staffing and Consulting Services.

Our success and our clients’ success are built on a foundation of service excellence. We are an equal opportunity employer, and we do not discriminate on the basis of race, religion, color, national origin, sex, sexual orientation, age, veteran status, disability, genetic information, or other applicable legally protected characteristic. Qualified applicants with arrest or conviction records will be considered for employment in accordance with applicable law, including the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act.

Unincorporated LA County workers: we reasonably believe that criminal history may have a direct, adverse and negative relationship with certain job duties, potentially resulting in the withdrawal of a conditional offer of employment. This includes handling client provided property, including hardware (both of which may include data) entrusted to you from theft, loss or damage; return all portable client computer hardware in your possession (including the data contained therein) upon completion of the assignment, and;

maintain the confidentiality of client proprietary, confidential, or non-public information. In addition, job duties require access to secure and protected client information technology systems and related data security obligations.