Mainframe Software Engineer
Confirmed on the employer's own hiring board on Nov 13, 2026. First seen by Alion on Nov 13, 2026.
About the Team
Our team is responsible for maintaining, supporting, and continuously improving critical Mainframe systems and applications that support key business and financial operations. We focus on ensuring system stability, operational efficiency, and reliable technology solutions through the implementation, maintenance, and modernization of existing platforms.
We work collaboratively with global teams to address complex technical challenges, resolve critical incidents, promote continuous improvement, and ensure compliance with software development best practices. Our team values technical expertise, knowledge sharing, innovation, and collaboration to deliver reliable solutions that support business needs.
About the Role
As a Senior Software Engineer (Level H), you will be a one-on-one contributor in a platform-level position. You will be responsible for the implementation and production deployment of mainframe-based systems, as well as the maintenance and possible redesign of existing on-premise applications.
What You'll Do
- Translating complex business processes into concrete technical implementations
- Follow and act according to the established installation line.
- Reads and interprets design diagrams, and effectively replicates that knowledge to junior engineers
- Review GitHub to ensure compliance with software development best practices
- Design and develop tests throughout the entire software development lifecycle - from unit testing to end-to-end (E2E) testing
- Support for accounting processes, accounts payable and reports.
- Escalation and resolution of critical incidents.
- Proposals for continuous improvements and coordination with global teams.
What You'll Bring
- 5+ years of solid and practical programming experience, with a primary focus on the Mainframe ecosystem
- Knowledge of Mainframe languages (COBOL, JCL, DB2, CICS, IMS)
- Knowledge in ServiceNow, Jira, Control-M.
- Experience in development and maintenance of applications in a Mainframe environment.
- Knowledge of batch and transactional processes in mainframe environments.
- Ability to analyze information flows between HOST and satellite systems.
- Demonstrated Experience Implementing Design Patterns
- Excellent ability to independently analyze complex issues, develop innovative solutions, and provide technical leadership
- Highly collaborative mindset with a genuine curiosity to learn and explore software in depth
- Overview of the software development lifecycle on the mainframe
- Communication Knowledge
What You'll Bring
- 5+ years of solid and practical programming experience, with a primary focus on the Mainframe ecosystem
- Knowledge of Mainframe languages (COBOL, JCL, DB2, CICS, IMS)
- Knowledge in ServiceNow, Jira, Control-M.
- Experience in development and maintenance of applications in a Mainframe environment.
- Knowledge of batch and transactional processes in mainframe environments.
- Ability to analyze information flows between HOST and satellite systems.
- Demonstrated Experience Implementing Design Patterns
- Excellent ability to independently analyze complex issues, develop innovative solutions, and provide technical leadership
- Highly collaborative mindset with a genuine curiosity to learn and explore software in depth
- Overview of the software development lifecycle on the mainframe
- Communication Knowledge
Nice to Have
- Leadership
- Handling work under pressure
- Advanced/Intermediate English
Equal Opportunity Employer
Walmart, Inc. is an Equal Opportunity Employer - By Choice. We believe we are best equipped to help our associates, customers and the communities we serve live better when we really know them. That means understanding, respecting and valuing diversity- unique styles, experiences, identities, ideas and opinions - while being inclusive of all people.
The above information has been designed to indicate the general nature and level of work performed in the role. It is not designed to contain or be interpreted as a comprehensive inventory of all responsibilities and qualifications required of employees assigned to this job. The full Job Description can be made available as part of the hiring process.
At Walmart de México y Centroamérica, we are committed to fostering a culture of belonging. Therefore, we seek to attract and hire the best talent based on competencies, skills, and potential. We do not discriminate on any grounds, including gender, age, ethnic origin, physical appearance, marital status, HIV-related health conditions or any other illness, socioeconomic status, disability, sexual orientation, gender identity, or gender expression. As a result, throughout the attraction and selection process, we will not request personal information, photographs, or any type of medical examinations. A candidate’s personal information is not relevant during the interview process or for the final hiring decision. At Walmart de México y Centroamérica, we are committed to ensuring that our associates experience a workplace every day that is respectful and free from discrimination and sexual harassment.