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Hi HN, we’re Sai and Aayush and we’re building Hypercubic (<a href="https:&#x2F;&#x2F;www.hypercubic.ai&#x2F;">https:&#x2F;&#x2F;www.hypercubic.ai&#x2F;</a>)!Hypercubic is an AI platform that helps Fortune 500 companies understand, preserve, and modernize their mainframe systems. These are the systems that run COBOL from the 1960s that still quietly power banking, insurance, airlines, and governments today.70% of the Fortune 500 still run on mainframes, but the engineers who built and maintained them are retiring. Today, the average age of a COBOL&#x2F;mainframe engineer is about 55 and rapidly increasing. What’s left behind are opaque, black box systems with almost no one who understands how they work. Modernization projects often fail, documentation is decades out of date, and critical institutional knowledge lives only in the minds of a few senior subject matter experts who are now leaving the workforce.Current “AI for code” tools focus on codebases and repositories, so they miss the unwritten rules, historical context, and architectural reasoning that live in human minds. In the COBOL&#x2F;mainframe world, that institutional knowledge is the key missing piece.What we heard from modernization leaders is that the hard part is not the code analysis. The challenge is the institutional knowledge that never made it into code or documentation and has walked out the door. Modernization projects fail not because no one can parse COBOL, but because no one can answer “why was this billing edge case added in 1995 and what breaks if we remove it.”Hypercubic is building an AI-native maintenance and modernization platform that learns how legacy mainframe systems actually work and captures the human reasoning behind operating them. We’re doing this with two initial tools, HyperDocs and HyperTwin.HyperDocs ingests COBOL, JCL, and PL&#x2F;I codebases to generate documentation, architecture diagrams, and dependency graphs. Enterprises currently spend months or years hiring contractors to reverse-engineer these systems; HyperDocs compresses that work to take much less time.COBOL was designed to resemble English and business prose, making it a good fit for LLMs today. Mainframes have decades of consistent patterns (COBOL, JCL, CICS, batch jobs) and a finite set of recurring tasks (such as payroll, transaction processing, billing).For example, here’s a billing fragment that would be run nightly in production at large insurance companies for moving money, closing accounts, and triggering downstream reports:<pre><code> EVALUATE TRUE
 WHEN PAYMENT-DUE AND NOT PAID
 PERFORM CALCULATE-LATE-FEE
 PERFORM GENERATE-NOTICE
 WHEN PAYMENT-RECEIVED AND BALANCE-DUE = 0
 MOVE &quot;ACCOUNT CLEAR&quot; TO STATUS
 PERFORM ARCHIVE-STATEMENT
 WHEN OTHER
 PERFORM LOG-ANOMALY
 END-EVALUATE.
</code></pre>
Now imagine thousands of these rules, each running payrolls, processing claims, or reconciling accounts, spread across millions of lines of code written over 40+ years. HyperDocs ingests that code and reconstructs it into readable, living documentation that shows how the black box system works.Our other tool, HyperTwin, tackles the “tribal knowledge” problem. It learns directly from subject-matter experts, observing workflows, analyzing screen interactions, and conducting AI-driven interviews to capture how they debug and reason about their systems. The goal is to build digital “twins” of the experts on how they debug, architect, and maintain these systems in practice.Together, HyperDocs and HyperTwin form a knowledge graph of legacy systems linking code, systems, and human reasoning.Here’s a demo video of our HyperTwin product: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=C-tNtl9Z_jY" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=C-tNtl9Z_jY</a>You can explore our documentation platform, including examples from the AWS Card Demo (a widely used COBOL codebase example) and a dummy insurance project here:
<a href="https:&#x2F;&#x2F;hyperdocs-public.onrender.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;hyperdocs-public.onrender.com&#x2F;</a>.e.g. Developer perspective docs - High level system architecture of credit card management: 
<a href="https:&#x2F;&#x2F;hyperdocs-public.onrender.com&#x2F;docs&#x2F;aws-carddemo-with-dev-docs&#x2F;developer&#x2F;architecture&#x2F;system-architecture" rel="nofollow">https:&#x2F;&#x2F;hyperdocs-public.onrender.com&#x2F;docs&#x2F;aws-carddemo-with...</a>We’re curious to hear your thoughts and feedback, especially from anyone who’s worked with mainframes or tried to modernize legacy systems.

Launch HN: Hypercubic (YC F25) – AI for COBOL and Mainframes

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