Modernize your COBOL core without replacing it.

We wrap legacy banking systems in modern REST APIs — with mathematical proof that the logic is preserved and a full audit trail for regulators.

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4-week pilot. No long-term commitment required.

The Problem

Three forces squeezing community banks

You don't need a $100M project. You need a smaller first step.

⏲

The Talent Cliff

Your senior COBOL engineers are retiring. The talent pool is shrinking every year, and competing with large institutions for the remaining developers isn't sustainable.

🔒

The Innovation Gap

Legacy cores can't natively connect to FedNow, digital banking platforms, or fintech APIs. Your competitors are moving faster because their systems can talk to modern tools.

⚠

The Modernization Trap

Full rip-and-replace projects cost $100M+, take 3-5 years, and fail 70% of the time. The cure is often worse than the disease.

The Approach

Wrap, don't replace

Your mainframe keeps running. You get a modern API layer in front of it.

Analyze

We read your COBOL source and map every data structure, business rule, and financial calculation — line by line.

Generate

Modern REST APIs with financial-grade precision. We use exact decimal math — never floating point — to match COBOL's packed decimal behavior.

Verify

The Mirror Test: identical inputs through old and new systems, asserting outputs match exactly. Mathematical proof, not promises.

Why Cobolink

What makes this different

We don't ask you to trust the AI. We give you proof.

The Mirror Test

Every API output is verified against the COBOL output to 12 decimal places. If they don't match, the test fails. This is the mathematical proof your auditors need.

Line-by-Line Audit Trail

Every endpoint ships with metadata that traces each piece of logic back to the exact COBOL source file and line number. Built for FFIEC and OCC examiners.

Your Infrastructure

Runs on your servers, in your VPC. No data ever leaves your environment. Self-hosted, vendor-independent — you own the code.

Security Improvements

Legacy COBOL often has SQL injection vulnerabilities and hardcoded credentials. Our wrappers fix these issues with parameterized queries and PII masking — automatically.

Comparison

A lower-risk path

	Rip-and-Replace	Generic AI Tool	Cobolink
Risk	Extreme	Unverified	Mathematically verified
Timeline	2-5 years	Unknown	4 weeks per module
Audit Trail	Manual docs	None	Automatic, line-by-line
Data Residency	Varies	Third-party cloud	Your infrastructure
Mainframe Impact	Full replacement	Varies	Zero — runs alongside
Cost	$100M+	Varies	$25-50K per module

Start with one module.

We take one non-critical COBOL module, produce a verified API wrapper with full audit documentation, and deliver a migration roadmap for the rest of your core.

Schedule a Conversation

4-week pilot engagement. No long-term commitment.