Jobs › Ensono

Senior Software Engineer - Mainframe

Ensono · Remote · $106,000–$120,000 a year · E2520 MF Application Managed Services

Posted Sep 30, 2026 · We last checked this listing on Oct 6, 2026

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Likely interview questions for this role

Written from this job description, not a generic list. Each one notes what the interviewer is really checking.

About your past

Tell me about a critical mainframe application you were the technical lead on. What did you own?

What they are checking: Whether they have truly led application support, not just worked tickets on it.

What DevOps practices have you brought to a mainframe team, and how did people react?

What they are checking: Whether they can lead modernization of how mainframe teams work, including winning people over.

Tell me about a time you explained a technical issue to a business user who was frustrated.

What they are checking: Whether they can communicate clearly with non-technical people during stressful moments.

What would you do

A junior developer's change caused a production incident. How do you handle it with them and the client?

What they are checking: Whether they protect the client, fix the problem and coach the developer without blame.

You get three urgent tickets at once from different users. How do you decide what comes first?

What they are checking: Whether they prioritize by business impact and communicate clearly with each requester.

How do you estimate the effort for an enhancement in an application you do not know well?

What they are checking: Whether they estimate honestly, include unknowns and update the estimate as they learn.

About the work

How would you design a COBOL change that touches CICS, DB2 and batch jobs so it can be rolled back safely?

What they are checking: Whether they think about end-to-end impact and rollback across connected parts of a system.

A DB2 query in a batch job suddenly runs ten times slower. How do you investigate?

What they are checking: Whether they understand access paths, statistics and EXPLAIN well enough to fix performance issues.

How have you used middleware like MQ to connect mainframe applications to other systems?

What they are checking: Whether they understand integration patterns that link mainframes to modern applications.

How do you review code from other developers on your team?

What they are checking: Whether they review with clear standards that catch risk before production.

How do you document an application so new team members can support it?

What they are checking: Whether they reduce the risk of knowledge living only in one person's head.

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The full job description

As published by Ensono.

At Ensono, our Purpose is to be a relentless ally, disrupting the status quo and unleashing our clients to Do Great Things !  We enable our clients to achieve key business outcomes that reshape how our world runs. As an expert technology adviser and managed service provider with cross-platform certifications, Ensono empowers our clients to keep up with continuous change and embrace innovation. We can Do Great Things because we have great Associates. The Ensono Core Values unify our diverse talents and are woven into how we do business. These five traits are the key to achieving our purpose. Honesty – Reliability – Curiosity – Collaboration - Passion About the role and what you'll be doing:  This role requires a highly skilled and experienced Senior Mainframe Developer with 8+ Years of specialized technical experience to support, maintain, and enhance a suite of mainframe applications. The ideal candidate will have deep expertise in various skills in mainframe technologies, middleware, databases, and DevOps practices, with a strong understanding of enterprise application support and acts as a technical lead, responsible for maintaining, enhancing, and supporting critical mainframe applications while guiding junior team members • Design, develop, and maintain Mainframe applications using COBOL, CICS, JCL, DB2, and VSAM. • Experience in enterprise-level ticketing systems (ServiceNow, Service Manager, etc.) and their operational workflows. • Worked on waterfall and agile methodology projects; capable of handling - Incidents, Service Requests and Change Requests simultaneously. • Provide technical troubleshooting and resolution for complex application and integration. • Conduct performance tuning and optimization of Mainframe applications and database queries. • Develop technical documentation (Knowledge Base articles, SOPs) for business and support teams • Understand both functional and technical requirements and provide implementation/change options aligned with business needs. We want all new Associates to succeed in their roles at Ensono. That's why we've outlined the job requirements below. To be considered for this role, it's important that you meet all Required Qualifications. If you do not meet all of the Preferred Qualifications, we still encourage you to apply.   Required Qualifications • Education; Bachelor’s or Master’s degree in Computer Science, Information Technology, or a related field. • Experience; Extensive experience in mainframe application development, support and maintenance • Technical Skills: Proficiency in mainframe technologies such as COBOL, JCL, CICS, DB2, and VSAM. Strong understanding of software development life cycle (SDLC) methodologies. Experience with version control systems and software development tools. • Soft Skills: Excellent problem-solving and analytical skills. Strong communication and interpersonal skills.  • US Citizen Why Ensono? Ensono is a place to make better happen – for our clients and for your career. You can do great things through innovation or collaboration, by learning or volunteering, or to promote diversity and inclusion. You can do great things for your own health or for a healthier planet. Whatever it means to you to do great things we want Ensono to be the place you can do it.  We are a client-facing business, but we do encourage clients to allow us to work remotely most of the time so if you are not required to be on a client site, you can choose to work from home or in our Ensono offices. Some of our benefits include: • Unlimited Paid Days Off • Three health plan options • 401k with company match • Eligibility for dental, vision, short and long-term disability, life and AD&D coverage, and flexible spending accounts • Family Forming Benefit including fertility coverage and adoption/surrogacy reimbursement • Paid childbearing and paternal leave • Education Reimbursement, Student Loan Assistance or 529 College Funding • Sabbatical leave • Wellness program • Flexible work schedule As of the date of this posting, a good faith estimate of the current pay scale for this role is $106,000 to $120,000 to annually based on a full-time schedule. Please note that placement in the range may vary based on numerous factors including but not limited to skills, experience, internal equity, and business needs. In addition to base salary, other compensation programs, depending on eligibility, include an annual bonus plan based on company and individual performance and an equity grant under our Associate Equity Appreciation Program. Ensono is an Equal Opportunity/Affirmative Action employer. We are committed to providing equal employment to our Associates and building a diverse and inclusive workforce. All qualified applicants will be considered without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, protected veteran status, disability, or other legally protected basis, in accordance with applicable law. Pay transparency nondiscrimination statement/posting OFCCP’s pay transparency policy can be found on OFCCP’s website . If you need accommodation at any point during the application or interview process, please let your recruiter know or email USTalentAcquisition@ensono.com .

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