Mainframe Engineer

Fidelity TalentSource is your destination for discovering your next temporary role at Fidelity Investments. We are currently sourcing for a Mainframe Engineer to work in Westlake, TX!



Senior Full Stack Mainframe Engineer (Contract)


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 capable of 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 perfection.

Required Qualifications:

• 8+ years of enterprise Mainframe development experience.
• Strong expertise in:
• COBOL
• JCL
• CICS
• DB2 (Native SQL and COBOL Stored Procedures)
• VSAM
• Syncsort
• Experience designing and integrating REST APIs using XML and JSON.
• 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, 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.

Please be advised that Fidelity's business is governed by the provisions of the Securities Exchange Act of 1934, the Investment Advisers Act of 1940, the Investment Company Act of 1940, ERISA, numerous state laws governing securities, investment and retirement-related financial activities and the rules and regulations of numerous self-regulatory organizations, including FINRA, among others. Those laws and regulations may restrict Fidelity from hiring and/or associating with individuals with certain Criminal Histories.
Company Overview

At Fidelity, we are passionate about making our financial expertise broadly accessible and effective in helping people live the lives they want! We are a privately held company that places a high degree of value in creating and nurturing a work environment that attracts the best talent and reflects our commitment to our associates. We are proud of our diverse and inclusive workplace where we respect and value our associates for their unique perspectives and experiences. For information about working at Fidelity, visit FidelityCareers.com. Fidelity Investments is an equal opportunity employer. Fidelity will reasonably accommodate applicants with disabilities who need adjustments to complete the application or interview process.


Fidelity TalentSource, is the in-house temporary staffing provider for Fidelity Investments. Unlike traditional staffing agencies, we are an internal business unit within Fidelity's Talent Acquisition team, dedicated to recruiting talent from various backgrounds for roles in Fidelity's regional and investor center locations. Our mission is to help you experience Fidelity's diverse and inclusive workplace while expanding your skill set and professional network, with the ultimate goal of conversion to full-time employment as part of Fidelity's long-term strategy.


For information about working at Fidelity TalentSource, visit FTSJobs.com.


Fidelity TalentSource will reasonably accommodate applicants with disabilities who need adjustments in order to complete the application or interview process. Please email us at View email address on click.appcast.io if you would like to request an accommodation.