Senior Software Engineer - Mainframe

ensono; United States; Hybrid; USD 120,000 - 160,000; Full time

Benefits offered by this job

Unlimited PTO

Health plan options

401(k) with company match

Fertility coverage

Parental leave

Education reimbursement

Remote-first posture with WFH/onsite

Annual bonus plan

Job summary

Ensono is seeking a senior mainframe specialist to support, maintain, and enhance a suite of critical mainframe applications. This role blends hands-on coding with technical leadership, mentoring junior developers and serving as a subject-matter expert across enterprise application support.

You will design and optimize COBOL, CICS, JCL, DB2, and VSAM solutions, lead complex troubleshooting, and drive performance tuning within structured SDLC processes, including both waterfall and agile delivery.

Qualifications

• 8+ years of specialized experience in mainframe application development, support, and maintenance.
• Proficiency in COBOL, JCL, CICS, DB2, and VSAM.
• Strong command of SDLC methodologies.
• Hands-on experience with version control systems and modern software development tools.
• Comfort working across both waterfall and agile delivery models.
• Excellent problem-solving, analytical, and interpersonal communication skills.

Responsibilities

• Design, develop, and maintain mainframe applications using COBOL, CICS, JCL, DB2, and VSAM.
• Lead complex troubleshooting and resolution for application and integration issues.
• Conduct performance tuning and optimization of mainframe applications and database queries.
• Manage incidents, service requests, and change requests through enterprise ticketing systems such as ServiceNow.
• Translate functional and technical requirements into implementation options that align with business needs.
• Author and maintain technical documentation, including knowledge-base articles and standard operating procedures.

Job description

Role overview

This senior-level position focuses on supporting, maintaining, and enhancing a suite of critical mainframe applications. The role combines hands-on technical work with technical leadership, mentoring junior developers while acting as a subject-matter expert across enterprise application support and delivery.

Responsibilities

• Design, develop, and maintain mainframe applications using COBOL, CICS, JCL, DB2, and VSAM.
• Lead complex troubleshooting and resolution for application and integration issues.
• Conduct performance tuning and optimization of mainframe applications and database queries.
• Manage incidents, service requests, and change requests through enterprise ticketing systems such as ServiceNow.
• Translate functional and technical requirements into implementation options that align with business needs.
• Author and maintain technical documentation, including knowledge-base articles and standard operating procedures.

Requirements

• Bachelor's or Master's degree in Computer Science, Information Technology, or a related field.
• 8+ years of specialized experience in mainframe application development, support, and maintenance.
• Proficiency in COBOL, JCL, CICS, DB2, and VSAM, plus strong command of SDLC methodologies.
• Hands-on experience with version control systems and modern software development tools.
• Comfort working across both waterfall and agile delivery models.
• Excellent problem-solving, analytical, and interpersonal communication skills.

Nice to have

• Prior experience acting as a technical lead guiding junior engineers.
• Familiarity with DevOps practices applied to mainframe environments.

Benefits and work setup

• Unlimited paid days off plus a flexible work schedule.
• Three health plan options, 401(k) with company match, and eligibility for dental, vision, short- and long-term disability, life and AD&D, and flexible spending accounts.
• Family-forming benefits including fertility coverage and adoption or surrogacy reimbursement.
• Paid parental leave, education reimbursement, student loan assistance, sabbatical leave, and a wellness program.
• Remote-first posture when client site presence is not required, with the option to work from home or office.
• Annual bonus plan plus eligibility for an equity appreciation grant based on company and individual performance.