The 21CS Difference

Real Investment, Real Innovation, Real Results

We're building the future of mainframe technology through genuine investment in people, products, and partnerships.

Schedule a Consultation

30+ Years of Innovation and Partnership

Since 1992, we've evolved alongside IBM and the mainframe industry, growing from a specialized software shop to a global innovation leader. Our partnership with IBM runs deep; we're business partners, we develop solutions for their portfolio, and we collaborate on advancing mainframe technology. 

But we've also carved our own path.

  • When market gaps emerged, we filled them.
  • When products needed modernization, we rebuilt them. 

Today, we're the only ISV developing a mainframe operating system, and we're connecting mainframes to the cloud in ways that seemed impossible just years ago. This combination of deep partnership and independent innovation means we can deliver solutions that honor mainframe heritage while pushing boundaries.

ibm-beyond

Investing in the Next Generation of Mainframe

The mainframe industry faces a critical challenge: experienced professionals are retiring faster than new talent is joining. We're solving this by creating comprehensive pathways into mainframe careers. Our internship programs, hackathons, and mentorship initiatives pair emerging talent with industry veterans, transferring decades of knowledge while bringing fresh perspectives to old problems. This investment benefits everyone—our teams develop more intuitive solutions, our support becomes more responsive, and our customers get products designed for both today's and tomorrow's workforce. When your experienced staff retires, you'll have solutions that new hires can actually use.

  • "It's not people like myself that have been in the industry forever that will take the mainframe industry to the next level. It's young talent with fresh ideas who will define its future, and we're investing everything in them."

    Eddy Ciliendo
    CEO

How We Work

Built Different, By Design

Our approach to mainframe innovation sets us apart in meaningful ways

  • Security First

    Built with enterprise-grade security from the ground up. Your data protection is non-negotiable.

  • Proven Stability

    33 years in business through every market cycle. We're built to last, just like your mainframe.

  • Global Presence, Local Support

    Strategic offices worldwide ensure expert support in your timezone and language.

  • Customer-Driven Development

    Your feedback shapes our roadmap. Real solutions come from real customer challenges.

  • Full-Stack Expertise

    From operating systems to migration tools, we understand every layer of your mainframe.

  • Long-term Commitment

    We're here for the decades ahead, continuously evolving our products and services.

Our Promise

What We Won't Do

Sometimes what you don't do matters as much as what you do.

Won't Outsource Your Support

When you call us, you'll reach someone in your region who understands your environment. We deliberately chose not to move operations to low-cost countries because real expertise matters more than margins.

Won't Abandon Products You Depend On

When others walk away from critical software, we step in. VSEn exists because we believe in continuity. Your investment in mainframe technology is safe with us for the long haul.

Won't Make Decisions by Committee

No armies of lawyers. No quarterly earnings pressure. No bureaucratic delays. When something needs to happen, we make it happen; usually within days, not months.

Won't Hire for Yesterday

We won't just recruit people who've "always done it this way." We bring in fresh perspectives and new ideas because the future of the mainframe requires different thinking.

Won't Nickel and Dime

As one customer said: “We come to the table without the goal to nickel and dime for more money." Transparent pricing, no surprise costs, no taking advantage when requirements change.

Won't Pretend to Innovate

We won't just put innovation on our website without taking action. Our hackathons produce real products. Our investments produce real results. Our promises match our actions.

Case Study

How We Turned a 3-Day Outage Into a 30-Minute Fix

When a major bank faced 72-hour outages, IZBR cut recovery to minutes. No war rooms—just 40,000 tapes migrated seamlessly and recovery times built for 2025 and beyond.

Read Full Story

Ready to Modernize Your Tech Stack?

Experience what happens when a mainframe company actually invests in innovation.

Schedule Your Consultation