A Startup Built an AI Employee Whose Only Job Is Using Your Terrible Old Software

The AI That Learned to Love Your 1990s ERP

A small product called Coasty launched last week with a pitch that sounds like a joke but isn't: it's an AI employee whose entire job is operating legacy enterprise software the way a human would. No API integration. No system modernization. Just an agent that logs in, clicks buttons, fills forms, and navigates UI flows in applications that were never designed to talk to anything else.

For two decades, the B2B playbook has been consistent: replace your old systems or suffer. Coasty flips that. Its value proposition is essentially "leave everything untouched and hire a synthetic worker whose job is tolerating the mess."

How It Works

Coasty is described as a "computer-use agent that operates legacy software the way a human would." Its differentiator isn't the AI model it runs on—it's the interaction mode. Instead of REST endpoints or SDKs, Coasty uses mouse, keyboard, and UI flows. It navigates screens the same way a back-office worker does, except it never gets bored, never takes lunch, and doesn't mind green-screen interfaces from 1997.

The product is positioned as infrastructure for AI agents, not a toy. That suggests companies might actually rely on it for critical workflows—the kind that currently require a contractor to log into three different systems, copy data between fields, and click "Submit" 200 times a day.

What This Actually Means

The existence of Coasty says something uncomfortable about how much of enterprise work is just UI mediation. How many jobs are fundamentally "be the human in the middle because two systems can't talk to each other"? How much back-office labor is re-codable as "click here, copy there, check this box"?

Consider a midmarket insurance company with a claims system that predates smartphones. Replacing it would cost millions and take years. Integrating it via API might not even be possible—the vendor stopped supporting new features in 2009. But hiring an AI agent to simply use it the way a person does? That's a Tuesday.

Coasty makes UI-level automation credible rather than a brittle hack. That changes the risk calculus for companies sitting on ancient software with no modernization budget. It also raises a question about the future shape of enterprise stacks: if you can put an AI in front of any application, does the real product become the orchestration layer that assigns tasks to agents, rather than the underlying system itself?

The Quiet Shift from "System of Record" to "System of Work"

APIs have been a hard requirement for automation since the early 2000s. If your software didn't expose its functionality programmatically, you were stuck with manual processes or expensive consultants writing brittle screen-scraping scripts. Coasty suggests that's no longer true.

Agentic tools that can navigate UIs change the equation. They turn any piece of software—no matter how old, how proprietary, or how badly designed—into something that can be automated. The system of record stays frozen in time. The work layer on top of it becomes dynamic.

This has implications beyond just replacing tedious tasks. It means enterprises can delay or avoid large transformation projects. It also means the value shifts from owning good software to owning good orchestration—knowing which agent does what, when, and in what sequence.

The Labor Question No One Wants to Ask

There's a human dimension here that's easy to skip past. If you can hire an AI whose sole job is "log into the old ERP and do repetitive workflows," what happens to the people currently doing that work?

Some of those roles were always meant to be temporary—contractors hired to bridge a gap until a better system arrived. But others have been permanent fixtures for decades, with institutional knowledge and workarounds that keep things running. Coasty doesn't care about workarounds. It just does what it's told, the same way, every time.

The optimistic read is that this frees humans for higher-value work. The realistic read is that many companies will see this as a straightforward cost reduction. A Coasty-like agent doesn't need benefits, doesn't call in sick, and works overnight. For a CFO looking at a back office with 30 contractor seats doing repetitive data entry, the math is simple.

What Comes Next

Coasty is early, and it's small. But the concept—AI that uses software instead of integrating with it—is showing up in more places. The pattern is the same: instead of demanding that legacy systems change, build a layer that can tolerate them as-is.

That's a different kind of digital transformation. Not the kind where you rip out the old and install the new. The kind where you leave everything exactly as it is and just stop making humans deal with it.

It's not clear yet whether that's progress or just a very elaborate workaround. But for companies with decades-old software and no budget to replace it, Coasty offers a third option that didn't exist before: do nothing, and hire an AI to suffer through it instead.