---
title: 'Senior Mainframe Systems Programmer - ISV at Ensono'
canonical: 'https://feeny.ai/job/senior-mainframe-systems-programmer-isv-ensono-united-states-wxw4xfgakfwh'
type: 'job'
last_seen: '2026-09-06'
---

# Senior Mainframe Systems Programmer - ISV at Ensono

- **Company:** Ensono
- **Location:** United States
- **Work type:** remote
- **Posted:** 2026-09-01
- **Last confirmed live:** 2026-09-06
- **Apply:** https://ensono.com/company/careers/jobs-board/?gh_jid=4723376005

## Job description

As the Senior Mainframe Systems Programmer, you will provide support for on-going projects that require the installation, upgrade, testing, configuration, and implementation of all ISV software.  Your responsibilities also include monitoring and on call support for the software, research and evaluation of new software, assisting team members and other areas with technical questions and problem resolution.

You will have functional knowledge, use of z/OS components and detailed knowledge of support products such as tape management, scheduling, security, monitoring systems, and other z/OS supporting systems software.

Note: This is not an Applications Programming position.

## Key Areas of Focus for this Role

- Participate in On-call Schedule
- Incident / Problem resolution

z/OS & Tools your main tasks are related to:

- Incident, change and problem handling.
- Configuration and customization.
- Setup of parameters.
- Communication with vendors.
- Participation/contribution to technical projects.
- Solid understanding of z/OS and related product software z/OS.
- Ability to support in solving problems and implementing changes.
- Working knowledge of TSO/ISPF, SDSF, JCL.
- Good written and verbal skills.
- Strong analytical and problem-solving skills.

What the Ideal Candidate Brings to this Role

Required Qualifications help to assure new Associates are set up for success in their role with Ensono. To be considered for this career opportunity, it is important that you meet all Required Qualifications. Candidates that may meet some, but not all, Other Qualifications are still encouraged to apply.

Required Qualifications

- Minimum of 7+ years of experience within a mainframe environment within a large enterprise or equivalent combination of education and experience
- Bachelor’s degree required and/or equivalent work experience
- Knowledge and understanding of z/OS and z/OS installation and maintenance including SMP/E.
- Strong knowledge of TSO/ISPF, SDSF, JCL.
- Strong knowledge of Unix System Services (USS)
- Strong knowledge of Unix System Services (USS) file system management and security
- Ability to perform skill set of a Mainframe System Programmer
- Ability to perform moderately complex ISV installations
- Ability to work well as a team member.
- Stress resistant in case of Major Incident- and/or emergency situations.
- Good interpersonal, verbal and written communication skills
- Customer Service skills at management level
- Good collaboration and teamwork skills
- Must be self-motivated.
- Strong analytical skills and problem-solving capabilities.
- Good planning and organizational skills.
- Initiative and good learning abilities.

Good to have

- Knowledgeable in z/OS security.
- Knowledgeable in z/OS systems programming functions.
- Understand z/OS services structure, Parallel Sysplex, Catalog management.

Why [Ensono](https://www.ensono.com/company/culture/)?

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 $85,000 to $148,000 salary, 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](https://www.dol.gov/sites/dolgov/files/OFCCP/pdf/pay-transp_%20English_formattedESQA508c.pdf).

If you need accommodation at any point during the application or interview process, please let your recruiter know or email USTalentAcquisition@ensono.com.

## About Ensono

## Company Overview
- **One-liner**: Ensono is a managed IT services provider specializing in mainframe modernization, hybrid cloud migration and management, and AI enablement for Fortune 500 enterprises.
- **Entity Type**: Private
- **Headquarters**: Downers Grove, Illinois, USA
- **Founded**: 2015 (spun off from a larger entity; celebrated 10 years in 2025)
- **Founders**: Not publicly available (formed as a spin-off/private equity-backed entity)

## Core Business
- **Primary industry/industries**: IT Services & Consulting, Managed Cloud Services, Mainframe Modernization
- **Target customers**: B2B Enterprise; specifically Fortune 500 companies in highly regulated sectors including Financial Services, Insurance, Healthcare, Public Sector, Retail, and Manufacturing
- **Mission or purpose statement**: "To be a relentless ally, disrupting the status quo, enabling our clients to do great things" [ensono.com](https://www.ensono.com/company/about-us/)

## Products & Services
- **Mainframe Modernization**: Services to modernize legacy mainframe environments, including migration to cloud (Azure, AWS) and modernization of workloads.
- **Cloud Migration + Managed Cloud**: Consulting and managed services for migrating to and operating within hybrid cloud environments (AWS, Microsoft Azure).
- **Data + AI**: Predictive analytics and AI/ML services to turn data into business outcomes.
- **Managed IT Services**: Ongoing infrastructure management, security, and operations for enterprise IT environments.

## Market Standing
- **Valuation/Market Cap**: Not disclosed (private company)
- **Key Metric (Total Funding/Revenue)**: Revenue is not publicly disclosed. The company is backed by private equity (Kohlberg & Company is a known investor).
- **Notable Investors/Partners**: Kohlberg & Company (private equity); AWS (Premier Managed Service, Consulting, and Mainframe Modernization Partner); Microsoft Azure (2020 Azure Partner of the Year); IBM (multiple Challenge Coin awards); Kong (award-winning partnership with Pay.UK) [ensono.com](https://www.ensono.com/)
- **Growth Signals**: Named a "Top 15 managed services growth company"; celebrated 10 years of progress in January 2026; appointed Alisdair Wright as Managing Director of Europe in January 2026; won a Kong Innovation Award for a fraud prevention platform with Pay.UK in December 2025 [ensono.com](https://www.ensono.com/insights-and-news/newsroom-and-press/ensono-celebrates-10-years-of-progress-transforming-the-future-of-modern-services/)

## Competitive Advantages
- **Mainframe expertise**: Recognized as an ISG leader in Mainframe-as-a-Service, Mainframe Modernization, and Mainframe Operations — a rare and deep specialization.
- **Hyperscaler partnerships**: Premier partner status with both AWS and Microsoft Azure, offering multi-cloud flexibility.
- **"Relentless ally" model**: Positions itself as a transparent, flexible partner rather than a vendor, with a focus on long-term client relationships.
- **Highly regulated industry focus**: Deep expertise in compliance-heavy sectors (finance, insurance, healthcare, government) which creates high switching costs.
- **Associate Equity Program**: All associates are offered equity through the Associate Equity Appreciation Program (AEAP), aligning employee and company success [ensono.com](https://www.ensono.com/company/careers/).

## Strategic Focus
- **Hybrid cloud & mainframe modernization**: Helping clients bridge legacy systems with modern cloud architectures.
- **AI enablement**: Turning data into actionable insights via AI/ML, a key growth vector.
- **European expansion**: Recent appointment of a Managing Director for Europe signals geographic growth.
- **Talent development**: Investing in the "Ensono Academies" to develop next-gen tech leaders and the "Fellows Program" to retain expert technologists in non-managerial executive roles.

## Why Work Here
- **Culture**: High employee engagement (92% overall engagement in a Gallup survey with 91% participation rate). Core values: Honesty, Reliability, Curiosity, Collaboration, Passion [ensono.com](https://www.ensono.com/company/culture/).
- **Work model**: "Global-first organization" with physical offices in Europe, India, and the United States, plus remote workforce concentrations. Remote, hybrid, and office-based roles available globally.
- **Perks**: Health and benefits from day one; paid volunteer days; Associate Equity Appreciation Program (AEAP); Ensono University for continuous learning; recognition and award programs.
- **Engineering culture**: Focus on innovation without requiring management responsibilities through the "Fellows Program" (Technical Fellow Career Path). IBM Champions are recognized and celebrated within the company.
- **DEI & Community**: Associate Community Groups (Culture Clubs), Ensono Women Connected initiative, global charity programs, and sustainability commitments.
- **Growth**: Strong emphasis on internal mobility and career development via "Ensono Academies" and ongoing learning.

## Sources
1. [ensono.com](https://www.ensono.com/)
2. [ensono.com - About Us](https://www.ensono.com/company/about-us/)
3. [ensono.com - Careers & Culture](https://www.ensono.com/company/careers/)
4. [ensono.com - Company Culture](https://www.ensono.com/company/culture/)
5. [ensono.com - Jobs Board](https://www.ensono.com/company/careers/jobs-board/)
6. [ensono.com - Newsroom (10 Year Anniversary)](https://www.ensono.com/insights-and-news/newsroom-and-press/ensono-celebrates-10-years-of-progress-transforming-the-future-of-modern-services/)
7. [ensono.com - Newsroom (Kong Innovation Award)](https://www.ensono.com/insights-and-news/newsroom-and-press/ensono-wins-kong-innovation-award-for-fraud-prevention-platform-with-pay-uk/)
8. [ensono.com - Newsroom (Europe MD Appointment)](https://www.ensono.com/insights-and-news/newsroom-and-press/ensono-appoints-alisdair-wright-as-managing-director-of-europe/)

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