EWIS AEGIS · Legacy Modernization
Modernize Old Code with Certainty.
Why aging business-critical applications quietly accumulate risk, and how AI-powered modernization extracts decades of embedded business rules to deliver modern code, safely.
Recent Client Result
1 week
End-to-end modernization
80%
Reduction in support costs
156
Security vulnerabilities resolved
Case Studies
Legacy Isn't Just Mainframes
Real transformations. Real results. See what AEGIS delivered for these organizations — in days, not months.
1 week
vs. 6+ months manual estimate
Before
- –15-year-old banking application
- –Written in Java 1.2
- –500,000 lines of code
After
- ✓Upgraded to Java 10
- ✓75 hidden security flaws fixed
- ✓Delivered in 1 week
80%
Reduction in support costs
Before
- –1,600 POS terminals on old Java
- –PHP + Oracle backend (8 years old)
- –Dedicated IT team required
- –7-month upgrade estimate
After
- ✓Backend: React, Node.js, Postgres
- ✓POS upgraded to latest Java
- ✓Delivered in 2 weeks
- ✓Vastly improved performance
156
SQL-injection sites closed
Before
- –ASP.NET WebForms application
- –.NET Framework 3.5 (end-of-life)
- –Fragile keyword-blacklist security
After
- ✓.NET 10 + React 19 Clean Architecture
- ✓SSO, Stateless JWT auth, Kubernetes deploy
- ✓677-test parity & regression suite
- ✓SQL injections closed
The Firefox Signal
271 vulnerabilities were recently patched in the Firefox codebase — a modern, actively-maintained project. Imagine what's hiding in 10-to-15-year-old enterprise code.
How it Works
See AEGIS in Action
The Challenge
Business Risks of Legacy Applications
When 15 to 20 year-old systems run critical functions, the impact lands on revenue, agility, and the balance sheet.
Hidden Cost Drag
60 to 80% of IT budgets often go to maintenance, not new capability. Premium rates for niche skills and extended support fees compound over time.
Compliance & Legal Exposure
Frameworks like PCI-DSS, HIPAA, SOC 2, and GDPR may be impossible to satisfy. Regulatory penalties and audit failures follow.
Security Vulnerabilities
Pre-modern security practices and unpatched frameworks leave known exploits permanently open. That makes the system a prime target for ransomware and supply chain attacks.
Scarce Technical Skills
Engineers fluent in VB6, Classic ASP, COBOL, Delphi, or PowerBuilder are increasingly rare and expensive. Business risk grows every year.
Operational Fragility
Systems sit on unsupported OS, DB, or middleware versions. Hardware failures become catastrophic when reinstallation is no longer feasible.
Knowledge & Documentation Gaps
Original developers are gone, docs are stale or missing, and tribal knowledge sits with one or two people. Routine fixes turn into archaeology.
The Product
AI-Powered Legacy Modernization with Engineers ALWAYS in the Loop
AEGIS reads your legacy code, extracts decades of embedded business rules, and tests every change in a secure, simulated environment. What you get is modern code, ready to implement in your environment. An experienced engineer manages and validates every step, and the audit trail records the entire process.
Any orchestration layer must be managed by experienced engineers.
Understands Your System
Reads and maps every feature, rule, and data structure in your old application, including undocumented business logic.
Creates a Detailed Blueprint
Produces a blueprint of exactly what needs to change and how, before touching a single line of code.
Automatically Builds the New System
AI agents write, test, and refine the new code until it works correctly. They self-correct throughout.
Delivers a Complete Product
You receive a modern application, tested and ready to deploy, along with a full audit report of every change made.
The Transformation
From jQuery to Next.js
The same application, before and after AEGIS. Business logic preserved; UI, architecture, and security rebuilt on a modern stack.
Why AEGIS
Days, not months or years.
The AEGIS Difference
A predictable, budget-friendly transformation with zero operational disruption and zero risk of losing critical institutional knowledge.
Works on Your Existing Code
No rebuilding from scratch. AEGIS modernizes what you already have and keeps the business logic that took decades to encode.
Self-Correcting AI
Issues are detected and resolved automatically as they arise. The system iterates until the new code behaves correctly.
Private, Dedicated Environment
The rewrite happens on a secure server dedicated to you. Your proprietary code and data never leave that environment.
Complete Audit Trail
Every change is documented. You get a full report of what was modified, why, and how it was validated.
Full-Stack Coverage
APIs, databases, frontend, business logic: AEGIS handles every layer of your application, not just isolated pieces.
~80%
Faster than traditional modernization
For Your Bottom Line
Dedicated infrastructure. Your code never leaves your environment.
Compatibility
Built for Any Stack
AEGIS isn't tied to a single language, framework, or cloud. The modernized stack and architecture are shaped by your requirements, not the limitations of the tool.
Language Upgrade
Java 1.0
↓
Java 12
Modernized 15-year-old Java codebase to a current, supported runtime.
Framework Modernization
.NET 4.0
↓
.NET 10
Brought a Microsoft enterprise application onto the latest .NET platform.
Mainframe to Modern
AS400 4GL
↓
Java 10
Migrated a legacy AS400 system off proprietary hardware onto a portable Java stack.
Full-Stack Rearchitecture
.NET + MS SQL
↓
Next.js + Postgres
Re-platformed a Microsoft-stack application onto a modern open-source web architecture.
Cloud Migration
On-prem Web App
↓
AWS · EC2 · Lambda
Lifted and rearchitected a web application into AWS managed services and serverless APIs.
FAQ
Frequently Asked Questions
Straight answers to the questions we hear most often.
Get in touch with us
Ready to modernize your legacy applications? Schedule a 30 minute demo or send me an email.