Slow, Risky Rewrites
Manual rewrites take years and put critical business logic at risk.
Legacy-to-Modern Code Migration
Reforge Legacy Systems.
Keep Everything That Works.
Xccelera ReForge analyzes, converts and validates legacy codebases, reshaping them into modern, AI-ready applications one safe module at a time.
Legacy
IDENTIFICATION DIVISION. PROGRAM-ID. INVCALC. DATA DIVISION. WORKING-STORAGE SECTION. 01 WS-SUBTOTAL PIC 9(7)V99 VALUE ZERO. 01 WS-TAX-RATE PIC V999 VALUE .180. 01 WS-DISCOUNT PIC 9(5)V99 VALUE ZERO. 01 WS-TOTAL PIC 9(7)V99 VALUE ZERO. PROCEDURE DIVISION. CALC-INVOICE. PERFORM VARYING IDX FROM 1 BY 1 UNTIL IDX > LINE-COUNT COMPUTE WS-SUBTOTAL = WS-SUBTOTAL + (LN-QTY(IDX) * LN-PRICE(IDX)) END-PERFORM. IF CUST-TIER = 'G' COMPUTE WS-DISCOUNT = WS-SUBTOTAL * 0.05 END-IF. COMPUTE WS-TOTAL ROUNDED = (WS-SUBTOTAL - WS-DISCOUNT) * (1 + WS-TAX-RATE). MOVE WS-TOTAL TO INV-TOTAL. STOP RUN.
Reforged
@Servicepublic class InvoiceCalculator { private static final BigDecimal TAX_RATE = new BigDecimal("0.18"); private static final BigDecimal GOLD_DISCOUNT = new BigDecimal("0.05"); public Invoice calculate(Order order) { BigDecimal subtotal = order.lines().stream() .map(l -> l.price().multiply(BigDecimal.valueOf(l.qty()))) .reduce(BigDecimal.ZERO, BigDecimal::add); BigDecimal discount = order.customer().tier() == Tier.GOLD ? subtotal.multiply(GOLD_DISCOUNT) : BigDecimal.ZERO; BigDecimal total = subtotal.subtract(discount) .multiply(BigDecimal.ONE.add(TAX_RATE)) .setScale(2, RoundingMode.HALF_UP); return new Invoice(order.id(), total); }}
Drag to compare
Business rules preserved: discount tiers, tax, rounding42 / 42 behaviour tests passed
The Cost of Standing Still
Legacy Doesn't Just Slow You Down.
It Holds AI Back.
Shrinking Skills Pool
Fewer engineers know legacy languages and frameworks each year.
Cut Off From AI
Older systems can't easily connect to modern APIs, clouds or AI agents.
The Modernization Path
Five Stages. Zero Guesswork.
- 01Stage 1
Assess
Map existing code, dependencies, data flows and embedded business rules.
- 02Stage 2
Plan
Choose the target stack and set a phased plan with acceptance criteria.
- 03Stage 3
Reforge
Agents convert code module by module to the target language and framework.
- 04Stage 4
Validate
New code is tested against original behavior; failures trigger an automatic fix.
- 05Stage 5
Release
Modernized modules go live alongside what's still running.
Conversion Showcase
See the Reforge, Line by Line
Every converted module comes with a clear before-and-after view and the tests that prove it still behaves the same.
Before
PERFORM VARYING IDX FROM 1 BY 1 UNTIL IDX > LINE-COUNT COMPUTE WS-SUBTOTAL = WS-SUBTOTAL + (LN-QTY(IDX) * LN-PRICE(IDX)) END-PERFORM. IF CUST-TIER = 'G' COMPUTE WS-DISCOUNT = WS-SUBTOTAL * 0.05 END-IF.
After
BigDecimal subtotal = order.lines().stream() .map(l -> l.price().multiply(valueOf(l.qty()))) .reduce(BigDecimal.ZERO, BigDecimal::add); BigDecimal discount = order.customer().isGold() ? subtotal.multiply(GOLD_DISCOUNT) : BigDecimal.ZERO;
Before
app.controller('OrdersCtrl', function($scope, $http) { $scope.orders = []; $scope.load = function() { $http.get('/api/orders').then(function(res) { $scope.orders = res.data.filter(function(o) { return o.status !== 'CANCELLED'; }); }); }; $scope.load();});
After
export function Orders() { const { data = [] } = useQuery({ queryKey: ['orders'], queryFn: () => api.get<Order[]>('/api/orders'), }); const active = data.filter(o => o.status !== 'CANCELLED'); return <OrderTable rows={active} />;}
Before
public class CustomerServlet extends HttpServlet { protected void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException { String id = req.getParameter("id"); Connection c = DriverManager.getConnection(DB_URL); ResultSet rs = c.createStatement().executeQuery( "SELECT * FROM CUSTOMER WHERE ID=" + id); res.getWriter().print(toXml(rs)); }}
After
@router.get("/customers/{customer_id}", response_model=Customer)async def get_customer(customer_id: int, db=Depends(get_db)): customer = await db.get(CustomerModel, customer_id) if customer is None: raise HTTPException(status_code=404) return customer
What Stays, What Changes
Your Business Logic Stays. The Limits Go.
PreservedCarried over exactly
- Business rules
- Data and workflows
- Integrations with systems of record
- The behavior your users rely on
ReforgedRebuilt for what's next
- Language and framework
- Architecture
- Cloud readiness
- Ability to connect with AI agents
Reforged and Protected
Reforged Systems Join the Rest of Your Platform
Xccelera Core
Build on the Modernized Foundation
Build new features on the modernized foundation, moving from concept to MVP, deployment and scale.
- 01ConceptAssess and plan the first module
- 02MVPFirst reforged module goes live
- 03DeploymentRolled out with Guard checks
- 04ScaleExtended across the codebase
Human-in-the-loop controls throughout
Explore →Xccelera Guard
Protected as It Moves
Clears vulnerabilities and outdated dependencies as code is migrated.
Connectors & Actions
Connected to Everything
Connect reforged systems to 100+ enterprise integrations.
Choose Your Pace
Reforge Incrementally or All at Once
Incremental ReForge
Start with one module or workflow, validate it, then expand across the codebase. No rip-and-replace.
- One module or workflow at a time
- Each step validated before the next
- Runs alongside what's live today
Best forBusiness-critical systems
Full Re-platform
Move a whole application to a modern, AI-native architecture through a phased, governed plan.
- Whole application, one governed plan
- Phased cut-over with checkpoints
- AI-native architecture from day one
Best forWhen the current stack has reached its limit
Start Your ReForge
Ready to Reforge Your Legacy?
Share your codebase context with an Xccelera AI architect and get a phased modernization path.