Mainframe Developer

Mainframe Developer Westlake, TX Type: Contract Category: Development Industry: Financial Services Standard Hours: Open Reference ID: JN -092026-108539 Date Posted: 09/09/2026 Shortcut: Description Recommended Jobs Description: Hybrid Every Other Week onsite / 5 days in Westlake, TX Our client seeks a Mainframe Developer to design, build, and support applications on a Z/OS platform. The team leverages financial domain expertise across demographic and financial feed processing, recordkeeping, and transaction processing. You will translate business requirements into software solutions using COBOL, DB2, CICS, JCL, and VSAM, while contributing to standards, policies, and development strategies. Due to client requirements, applicants must be willing and able to work on a w2 basis. For our w2 consultants, we offer a great benefits package that includes Medical, Dental, and Vision benefits, 401k with company matching, and life insurance. Rate: $50.00 to $54.00/hr. w2 Responsibilities: Perform as a full stack engineer, including requirements gathering, development, and testing. Participate in architecture design teams and help define and implement application level architecture. Develop applications on sophisticated projects, components, and subsystems. Recommend development testing tools and methodologies and review and validate test plans. Be responsible for QA readiness. Plan and conduct system testing. Develop comprehensive documentation for multiple applications or subsystems. Establish project plans for complex projects across multiple platforms. Plan and coordinate project schedules and assignments. Act as a primary liaison for business units to resolve project and technology issues. Provide technology solutions to daily issues and deliver technical evaluation estimates on initiatives. Advise senior management on technical strategy and mentor junior team members. Perform independent and complex technical and functional analysis for multiple projects. Identify opportunities to innovate and automate existing processes. Experience Requirements: Five years of mainframe application development, test automation, and support using COBOL, CICS, DB2, JCL, VSAM, MQ-Series, Java, Web Services, and SQL. Experience developing and deploying Batch and CICS applications. Experience with File-Aid for file format and comparison, version management with Endevor, debugging and unit testing using Intertest and Abend-AID, and scheduling with Control-M. Experience analyzing and designing data flows for mainframe applications. Experience with performance tuning in TSO and MVS environments using Endevor, Git, ClearCase, Control-M, Abend-AID, Intertest, File-Aid, Easytrieve, and tools such as Strobe, iStrobe, Platinum Detector, and TMON to reduce I/Os, CPU time, MSUs, and MIPs. Experience with open source technologies such as Python. Education Requirements: Bachelor's degree in Computer Science, Engineering, Information Technology, Information Systems, Mathematics, Physics, or a related field, and five years of experience in the role or in mainframe brokerage and stock plan services systems application development. Recruitment Transparency Notice Eliassen Group values transparency in our recruitment practices. Please be advised that Eliassen Group utilizes artificial intelligence (AI) tools as part of its initial application screening and hiring process. You may receive email and SMS notifications from the Eliassen Virtual Recruiting Team ( View email address on click.appcast.io , View phone number on click.appcast.io) inviting you to complete a brief voice screening as part of your application process. These tools assist our hiring teams in different ways, including but not limited to, assistance in reviewing application materials to help identify candidates whose qualifications most closely match the requirements of the position. All AI-assisted evaluations and responses are reviewed by human recruiters before any hiring decisions are made. The use of AI in our process is intended to support fairness, efficiency, and consistency, and Eliassen Group takes measures to prevent bias or discrimination in connection with its hiring practices. By proceeding, you acknowledge, agree, and consent to Eliassen Group's use of these tools, including AI tools, as part of the application and hiring process. Skills, experience, and other compensable factors will be considered when determining pay rate. The pay range provided in this posting reflects a W2 hourly rate; other employment options may be available that may result in pay outside of the provided range. W2 employees of Eliassen Group who are regularly scheduled to work 30 or more hours per week are eligible for the following benefits: medical (choice of 3 plans), dental, vision, pre-tax accounts, other voluntary benefits including life and disability insurance, 401(k) with match, and sick time if required by law in the worked-in state/locality. If anyone reaches out to you about an open position connected with Eliassen Group, please ensure that you are working directly with us by confirming the following:

• When you work with Eliassen Group, all email communication will come from an Eliassen.com address, never Gmail, Yahoo, etc.
• Eliassen Group will never ask you for personal information (home address, bank account, or check routing number) until you have worked with someone clearly associated with Eliassen Group.

If you have any indication of fraudulent activity, please contact View email address on click.appcast.io . About Eliassen Group: Eliassen Group is a strategic consulting firm that helps organizations reach further and achieve more through our technology, business advisory, and life sciences solutions. For nearly 40 years, we have combined exceptional people, deep domain expertise, and intelligent capabilities to expand our clients' capacity and accelerate meaningful outcomes. We are driven by a purpose to positively impact the lives of our employees, clients, consultants, and the communities we serve. Eliassen is committed to building a diverse and inclusive team from a variety of backgrounds, perspectives, and skills. We are an Equal Opportunity and Affirmative Action Employer and all employment decisions are based on merit, performance, and business needs. Eliassen does not discriminate on the basis of race, color, gender identity or expression, sexual preference or orientation, sex (including pregnancy, childbirth, and related medical conditions), marital status, creed, religion, physical or mental disability, genetic information, military or veteran status, age, ancestry, national origin, citizenship status, prohibited criminal record inquiries of applicants and employees, or any other category protected by federal, state, or local laws. Don't miss out on our referral program! If we hire a candidate that you refer us to then you can be eligible for a $1,000 referral check! Eliassen Group