Enterprise Modernization · COBOL

Migrate your COBOL for a
faster, agile enterprise.

Modernize legacy COBOL applications and eliminate the risk of manual intervention. 10decoders preserves your business logic while migrating to Java, .NET, cloud-native, and microservices architectures — with zero disruption.

0%
Business logic preserved post-migration
0%
Reduction in mainframe operating costs
0×
Faster time-to-market after modernization
Zero
Disruption to live business operations

Trusted by leading enterprises and healthcare teams

Chargeback
Datanuum
Dedalus
Facely
Harris Healthcare
Firetree
ForwardLane
IBM
M2P
Marque
Medworks
Merchantrade
Parthenon
Qodex
Shift
SmartBiz
Sojern
UFG
UrbanSDK
Zero Gravity
The Opportunity

Upgrade legacy COBOL to a digital platform.

10decoders helps businesses migrate and modernize COBOL applications to cloud-ready, API-driven, high-performance architectures using cutting-edge technologies such as Java, .NET, microservices, and serverless platforms.

With our automation-driven migration methodology, we minimize manual work and speed delivery while keeping your business up and running. Our extensive experience with mainframe transformation ensures organizations can lower operational costs, increase maintainability, and gain the agility required to meet the demands of digital innovation.

Start your migration
95%
Business logic preserved with automated translation
60%
Lower mainframe costs post-migration
Zero
Disruption with phased, parallel-run migration
3×
Faster time-to-market on modern stack
COBOL Migration Services

Bringing legacy COBOL to advanced levels.

Architectural designs that are scalable in capability and ease of operability — covering every phase from discovery through to cloud-native deployment.

Service 01

End-to-End COBOL Assessment & Automated Migration

Complete discovery of COBOL code, dependencies, business rules, and data flows — followed by tool-automated translation into maintainable .NET or Java. Better performance, more flexibility, and a clear path forward from day one.

Service 02

Mainframe Offloading & Cloud Modernization

Shift expensive COBOL workloads from aging mainframes to a secure, scalable, cloud-native environment. Dramatically less operational overhead, improved agility, better cost efficiency, and elastic utilization on demand.

Service 03

API Enablement, Modularization & Integration Readiness

Break monolithic COBOL systems into modular services and REST APIs that integrate cleanly with ERPs, CRMs, digital apps, and the broader enterprise ecosystem — unlocking data and logic that's been locked in the mainframe for decades.

Service 04

Modern UI Transformation & User Experience Revamp

Replace outdated green-screen and 3270 terminal interfaces with modern, intuitive web and mobile experiences. Dramatically enhanced usability, higher productivity, lower training burden, and far stronger user adoption across the enterprise.

Legacy COBOL Challenges

The cost of staying on the mainframe.

COBOL-reliant companies face critical limitations that inhibit growth, innovation, and operational agility. Here's what's holding your enterprise back.

Skill Gaps

The shrinking number of COBOL specialists makes updates slow, expensive, and increasingly unviable. A retirement wave is taking critical institutional knowledge with it.

Talent Risk

High Mainframe Operating Costs

COBOL workloads on aging mainframes are expensive. Licensing, infrastructure, and maintenance costs compound annually — diverting budget from innovation and growth.

Cost Risk

Limited Integration Capabilities

COBOL can't easily plug into REST APIs, cloud services, or modern digital platforms — creating data silos and blocking digital transformation at the core.

Capability Gap

Slow Development Cycles

Rigid, monolithic architectures decelerate every change request — preventing product innovation from reaching the market at the pace your competitors move.

Velocity Risk

Outdated User Experience

Green-screen and terminal-based interfaces cause productivity loss, steep learning curves, and weak user acceptance — a daily friction that compounds across your workforce.

UX Risk

Scalability & Performance Constraints

As transaction volume increases, legacy applications hit performance walls. They simply don't have the elasticity modern digital workloads require to scale on demand.

Performance Risk
The 10decoders Competitive Edge

Turning legacy COBOL into performance-driven digital assets.

Automation, engineering excellence, and proven mainframe migration expertise — combined to deliver transformation that is fast, safe, and built to last.

Cost-Effective & Efficient

Reduce modernization costs with our automation-first frameworks, rigorous processes, and reusable Migration Accelerator. Definite Delivery methodology means predictable timelines and no surprise overruns.

Stable & High-Performing

We develop secure modern applications designed to support mission-critical transactions and deliver with reliability and consistency — no compromise on the robustness that made COBOL endure for 60+ years.

Scalable & Agile

Modernized systems are designed to scale, be more adaptable, and integrate more easily — enabling rapid development and a significantly faster time-to-market for every product change and new capability.

Enhanced User Experience

Provide your teams with easy-to-use, modern interfaces built for faster and more effective operations — minimizing training requirements and maximizing staff engagement from day one of go-live.

Our Approach

A proven path from mainframe to modern.

COBOL migration isn't a big-bang rewrite — it's a structured, phased journey. Here's how we de-risk every step and keep your business running throughout.

Phase 01

Discovery & Assessment

Full COBOL codebase audit — map dependencies, business rules, data flows, and JCL scripts. Produce a risk-ranked modernization roadmap.

Phase 02

Automated Translation

Run the Migration Accelerator to auto-translate COBOL to Java or .NET, preserving all business logic. Manual expert review for complex patterns.

Phase 03

Validation & Parallel Run

Functional equivalence testing and performance benchmarking in parallel with the live mainframe. No cutover until results match or exceed baseline.

Phase 04

Go-Live & Enablement

Phased cutover with rollback safeguards, team training, documentation, and continuous AI Ops to keep your modernized stack evolving.

FAQ

COBOL, answered.

Direct answers about mainframe migration, risk, timelines, and what each approach actually means.

Why are enterprises still migrating off COBOL and mainframes?
Two forces drive it: rising mainframe licensing and staffing costs even as workloads stay flat, and integration friction with modern APIs and cloud services. COBOL itself remains reliable — the pressure to migrate is almost always about cost and integration, not code quality.
What’s the difference between rehosting, refactoring, and rearchitecting a COBOL system?
Rehosting moves code largely unchanged to a new runtime, reducing licensing costs quickly with low risk. Refactoring restructures or converts the code while preserving behavior. Rearchitecting rebuilds the system around modern patterns like microservices, removing constraints entirely but requiring the most investment.
How risky is migrating a core banking or insurance COBOL system?
This is treated as mission-critical with zero downtime tolerance. The approach validates behavior continuously against the legacy system, plans cutover around production constraints like batch windows, and typically runs legacy and modernized systems in parallel, reconciling outputs before full cutover.
Can COBOL business rules be automatically converted, or do they need manual rewriting?
Both approaches apply. Automated tools handle structurally simple logic reliably, but decades of undocumented edge cases typically require a hybrid approach — automated mapping combined with targeted manual review for complex sections, validated against real transaction data.
What would a phased COBOL modernization roadmap look like?
A typical roadmap starts with an assessment mapping the codebase and integration points, then rehosts the highest-cost workloads first for quick savings. It then refactors or rearchitects high-value modules blocking digital integration while keeping stable, low-change batch logic rehosted where appropriate.
Talk to our CTO

Start with a thirty-minute conversation.

No 50-page proposals. We'll tell you which level fits your situation, what a realistic engagement looks like, and what it would cost — in one direct meeting.

Who you'll talk to
Thomas, CTO at 10decoders

Thomas

Chief Technology Officer

Connect on LinkedIn

Thomas leads 10decoders' AI engineering practice and sits in on the scoping call himself — so the person mapping your engagement is the one who has shipped it before. His teams build and deploy agents for mid-market healthcare and fintech companies, with enterprise grade build experience for clients like IBM, Dedalus and Harris Healthcare. He'll be straight with you about what's worth doing and what isn't.

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Engineers
37+
Global Clients
ISO
27001 / 9001
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