Senior Mainframe Application Developer

Senior Mainframe Application Developer

Hybrid:
Tampa, FL or Dallas, TX

We are seeking an experienced Senior Mainframe Application Developer to lead the design, development, testing, and support of complex business applications. This role requires deep expertise in mainframe technologies, strong analytical skills, and the ability to manage the full software development lifecycle. The ideal candidate will collaborate with business stakeholders, support production environments, and deliver high‑quality, scalable solutions that meet organizational objectives.

• Analyze business requirements and translate them into technical solutions and specifications.
• Design, develop, and maintain complex application programs and enhancements.
• Evaluate business processes and recommend effective technology solutions.
• Conduct systems analysis to support application development and implementation initiatives.
• Provide application support, troubleshooting, and issue resolution.
• Support production systems and ensure application stability and performance.
• Coordinate and manage small‑scale projects with limited scope and duration when required.

• Define and develop test cases, test scenarios, and test scripts.
• Prepare and maintain testing environments.
• Execute component, integration, system, and user acceptance testing activities.
• Analyze testing results and communicate findings to stakeholders.
• Collaborate with business users to validate expected outcomes.
• Ensure adherence to quality assurance standards and development best practices.

• 10+ years of experience in application development and systems analysis.
• Bachelor's degree in a technical discipline or equivalent professional experience.
• Strong expertise in COBOL, CICS, and JCL development.
• Advanced SQL skills with extensive DB2 experience.
• Strong understanding of the Software Development Life Cycle (SDLC) and change management processes.
• Excellent analytical, problem‑solving, and communication skills.
• Demonstrated customer‑focused mindset and ability to work effectively with stakeholders.

• Experience with Agile development methodologies.
• Ability to create functional and technical documentation.
• Knowledge of MQ, FTP, and NDM.
• Experience with SWIFT ISO standards and XML.
• Familiarity with AQT.
• Exposure to Java, J2EE, JavaScript, Web Sphere Application Server (WAS) 8.5, and related technologies.
• Understanding of enterprise integration and financial services application environments.

The ideal candidate is a seasoned mainframe professional with strong technical expertise, a passion for solving complex business problems, and the ability to support mission‑critical applications throughout the development lifecycle. They thrive in collaborative environments and bring a commitment to quality, reliability, and continuous improvement.

Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law.

Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law.