Senior z/OS Developer

At Capgemini Engineering, the world leader in engineering services, we bring together a global team of engineers, scientists, and architects to help the world’s most innovative companies unleash their potential. From autonomous cars to life-saving robots, our digital and software technology experts think outside the box as they provide unique R&D and engineering services across all industries. Join us for a career full of opportunities. Where you can make a difference. Where no two days are the same. Location This role is remote anywhere in USA About the job you’re considering We are seeking an experienced Senior z/OS Assembler Programmer to play a key role in the development, enhancement, and Level 3 support of a mature enterprise z/OS product. This position requires deep expertise in Assembler programming, feature design, complex problem analysis, and issue resolution within a mainframe environment. The ideal candidate will possess strong technical leadership capabilities, be able to mentor and guide team members, and effectively communicate with customers while managing complex technical situations. Your role Understand complex legacy assembler applications quickly. Analyze, design and code new features. Diagnosing difficult production problems using dumps and traces and code fixes for the problems Lead others in development and L3 work Communicate effectively with customers and manage difficult situations Your skills and experience Expert in assembler language coding, with at least a decade of experience Strong knowledge of dump analysis Nice to have Experience working with TCP/IP and SNA networking protocols within z/OS environments. Understanding of Job Control Language (JCL) and its application in batch processing and system operations. Experience with VSAM data structures, file management, and performance tuning. Knowledge of z/OS task management, including Recovery Termination Management (RTM) and I/O support services. Familiarity with SMP/E for software installation, maintenance, and upgrade management. Experience working with UNIX System Services (USS) in z/OS environments. Knowledge of IBM C/C++ development on the mainframe platform. Experience developing and maintaining automation or utility scripts using REXX. Understanding of TLS, System SSL, and zIIP processor technologies to support secure and optimized mainframe workloads. Previous experience supporting or developing Managed File Transfer (MFT) solutions or other core z/OS system products would be highly beneficial. The base compensation range for this role in the posted location is: $82,082 to $193,440 Capgemini provides compensation range information in accordance with applicable national, state, provincial, and local pay transparency laws. The base compensation range listed for this position reflects the minimum and maximum target compensation Capgemini, in good faith, believes it may pay for the role at the time of this posting. This range may be subject to change as permitted by law. The actual compensation offered to any candidate may fall outside of the posted range and will be determined based on multiple factors legally permitted in the applicable jurisdiction. These may include, but are not limited to: Geographic location, Education and qualifications, Certifications and licenses, Relevant experience and skills, Seniority and performance, Market and business consideration, Internal pay equity. It is not typical for candidates to be hired at or near the top of the posted compensation range. In addition to base salary, this role may be eligible for additional compensation such as variable incentives, bonuses, or commissions, depending on the position and applicable laws. Capgemini offers a comprehensive, non-negotiable benefits package to all regular, full-time employees. In the U.S. and Canada, available benefits are determined by local policy and eligibility and may include: Paid time off based on employee grade (A-F), defined by policy: Vacation: 12-25 days, depending on grade, Company paid holidays, Personal Days, Sick Leave Medical, dental, and vision coverage (or provincial healthcare coordination in Canada) Retirement savings plans (e.g., 401(k) in the U.S., RRSP in Canada) Life and disability insurance Employee assistance programs Other benefits as provided by local policy and eligibility Important Notice: Compensation (including bonuses, commissions, or other forms of incentive pay) is not considered earned, vested, or payable until it becomes due under the terms of applicable plans or agreements and is subject to Capgemini’s discretion, consistent with applicable laws. The Company reserves the right to amend or withdraw compensation programs at any time, within the limits of applicable legislation. Disclaimers Capgemini is an Equal Opportunity Employer encouraging inclusion in the workplace. Capgemini also participates in the Partnership Accreditation in Indigenous Relations (PAIR) program which supports meaningful engagement with Indigenous communities across Canada by promoting fairness, accessibility, inclusion and respect. We value the rich cultural heritage and contributions of Indigenous Peoples and actively work to create a welcoming and respectful environment. All qualified applicants will receive consideration for employment without regard to race, national origin, gender identity/expression, age, religion, disability, sexual orientation, genetics, veteran status, marital status or any other characteristic protected by law. This is a general description of the Duties, Responsibilities and Qualifications required for this position. Physical, mental, sensory or environmental demands may be referenced in an attempt to communicate the manner in which this position traditionally is performed. Whenever necessary to provide individuals with disabilities an equal employment opportunity, Capgemini will consider reasonable accommodations that might involve varying job requirements and/or changing the way this job is performed, provided that such accommodation does not pose an undue hardship. Capgemini is committed to providing reasonable accommodation during our recruitment process. If you need assistance or accommodation, please reach out to your recruiting contact. Please be aware that Capgemini may capture your image (video or screenshot) during the interview process and that image may be used for verification, including during the hiring and onboarding process. Click the following link for more information on your rights as an Applicant in the United States. http://www.capgemini.com/resources/equal-employment-opportunity-is-the-law Capgemini is a global business and technology transformation partner, helping organizations to accelerate their dual transition to a digital and sustainable world, while creating tangible impact for enterprises and society. It is a responsible and diverse group of 340,000 team members in more than 50 countries. With its strong over 55-year heritage, Capgemini is trusted by its clients to unlock the value of technology to address the entire breadth of their business needs. It delivers end-to-end services and solutions leveraging strengths from strategy and design to engineering, all fueled by its market leading capabilities in AI, generative AI, cloud and data, combined with its deep industry expertise and partner ecosystem. Ref. code: 517338 Posted on: Aug 15, 2026 Experience Level: Experienced Professionals Contract Type: Permanent Location: Brand: Capgemini Engineering Professional Community: Software Engineering Nearest Major Market: Irving Nearest Secondary Market: Dallas