Is your legacy system holding your business back?

High infrastructure & maintenance costs
Impossible to scale to meet demand
Downtime, reliability, and availability issues
Compliance and security vulnerabilities
Legacy application
modernization services we provide
Application migration and cloud-native rebuild
Application re-engineering
Application re-architecting
Re-platforming
Infrastructure modernization
Mainframe modernization
SaaS transformation
Containerization and Kubernetes
Database modernization and data migration
DevOps / CI-CD enablement
Legacy software maintenance
Technical-debt & cloud-readiness assessment
Multi-system consolidation
App migration and cloud-native rebuild
Move your app to AWS, Azure, or GCP and rebuild it to take advantage of cloud-native services for better scale and lower cost. We’re here to assist you in planning and executing the optimal cloud migration strategy. We will help you choose and execute the right path to the cloud — whether that’s a straightforward lift-and-shift, a replatform, or a full rebuild into cloud-native architecture. Execute it in phases with no long outages and no data loss. Cut infrastructure costs and boost performance with Euristiq’s cloud migration engineering.
Application re-engineering
Re-engineer your legacy application at the code and architecture level to cut technical debt and improve performance. We restructure code and reduce architectural coupling using AI-assisted analysis and refactoring to move faster and catch risk earlier, then verify every change with automated regression testing. Gain a cleaner, more maintainable system preserving original scope and improving reliability.
Application re-architecting
Redesign your application’s structure for better flexibility, scalability, and independent deployability, breaking a monolith into independent, individually scalable microservices. We map service boundaries around real business domains, extract services incrementally so the system keeps running throughout, and design the API contracts each service needs to communicate cleanly with the rest.
Re-platforming
Move your application to a modern runtime or platform without a full rewrite – just enough changes to take advantage of what the new environment offers. This might include switching to a cloud-native database, changing the underlying OS, containerizing the app, or adopting platform-specific services, while keeping your core application logic intact.
Infrastructure modernization
Modernize the underlying infrastructure your application runs on – compute, storage, and network foundation – even when the application itself doesn’t require changes. We right-size compute resources, move storage to modern, cost-efficient tiers, and rebuild network architecture using infrastructure-as-code.
Mainframe modernization
Update and transform your legacy mainframe systems by migrating data to the cloud and developing cloud-native applications on the mainframe, to align with current and future business demands.
SaaS transformation
Turn your on-premise product into a multi-tenant, subscription-based cloud SaaS, lowering your total cost of ownership. We rebuild the architecture for true multi-tenancy, add subscription billing and self-service onboarding, and re-platform for elastic cloud scaling.
Containerization and Kubernetes
Containerize your legacy applications to standardize deployment, improve isolation, and enable controlled scaling across cloud and on-premises environments. We package applications and dependencies into portable containers and set up Kubernetes-ready deployment models with the governance your release process needs.
Database modernization and data migration
Migrate and modernize your legacy databases – moving from outdated, on-premises systems to modern, cloud-native platforms – with full data integrity, lineage, and zero data loss verified at every step.
DevOps / CI-CD enablement
Automate your build, test, and deployment pipelines to release faster with less risk. We set up CI/CD pipelines aligned with your change management and audit needs, with release automation that includes traceable approvals, rollback mechanisms, and environment-level controls.
Legacy software maintenance
Keep your systems running smoothly after modernization. Our legacy software maintenance service includes routine updates, bug fixes, and performance optimizations, ensuring your systems remain robust and updated without requiring a complete overhaul.
Technical-debt & cloud-readiness assessment
Before committing to a full modernization plan, evaluate the real state of your applications. We provide the service of quantifying your technical debt and mapping the cost and risk of continuing as it is. The next step is assessing whether and how your apps should move to the cloud, including a total cost of ownership model to support the business case.
Multi-system consolidation
Bring multiple overlapping systems (duplicate CRMs, ERPs, or legacy tools accumulated through growth or acquisition) onto one modern platform. Our team finds out what each system actually does, identifies redundant and conflicting functionality, and migrates the business logic and data your teams depend on into a single, unified platform without disrupting the operations running on the old ones.
What sets us apart
as legacy modernization company
AI-native delivery — 2× faster
AI runs through our 4D process, not just the products we ship: discovery, architecture, code, and testing. Same dedicated team, roughly half the timeline and cost.
Modernization without the rewrite gamble
We start with an audit that prices the risk — what your legacy system costs to keep, what it costs to change, and a phased path that front-loads quick wins.
One dedicated team, start to launch
A small cross-functional team owns your product from engagement through launch. No handoffs, no rotating faces, no re-explaining your business.
About us
Euristiq started in 2016 with a small team who kept running into the same problem: businesses stuck on systems too expensive to maintain and too fragile to change. Ten years and 300+ delivered projects later, that’s still what we fix.
Headquartered in Canada with delivery teams in Poland and Ukraine, we’re an AI-native legacy modernization firm. AI isn’t a service line we bolted on; it’s how we discover, re-architect, and re-build — which is why our 4D approach (Discover–Decide–Design–Deliver) delivers 2× faster and cheaper than traditional development.
For us the tech is never the label — the business pain is. Every engagement starts with what’s costing you money, time, or customers, and ends with software that measurably changes it.
Years on the market
Projects delivered
NPS score
Faster development
Hire trusted legacy modernization company
Clients success stories

Ryanair’s Web App 3× Faster: a Legacy Modernization Case Study

Energy Intelligence Software Rebuilt for a New Market — 76% Faster

Modernizing Investment Portfolio Management Software for £12.9B in Assets

Corporate Travel Booking Software That Doubled Bookings and Cut Failed Payments by 34%

A Legacy Student Information System Modernization Roadmap for 55,000+ Students

Two Platforms, One Plan: a Modernization Path That Didn’t Stop the Business

Asset Management Software Modernization
What our clients say




Industries we serve
Financial services & banking
Energy
Healthcare
Logistics & supply chain
Insurance
SaaS vendors with aging products
Manufacturing
Telecom
Energy & utilities
Government & public sector
Our legacy application modernization roadmap
Legacy app assessment
Strategy & roadmap
App modernization
Testing and post-modernization optimization
Go from outdated
to outstanding
FAQ
What does legacy modernization mean?
Legacy modernization means updating an existing outdated application – its code, architecture, or infrastructure – so it keeps running the business logic the organization depends on, so that it could scale, integrate, and stay secure. It’s not a rebuild from scratch; it’s evolving what already works instead of replacing it entirely.
How do I know it’s time to modernize?
The signs are usually financial and operational before they’re technical: maintenance costs spiking faster than the ability to ship new features, integrations that take months instead of weeks, frequent outages, and a shrinking team of people who understand the system. If any of that sounds familiar, it’s already time.
What are the common approaches to modernization?
Most modernization work falls into one of a few strategies: rehosting (moving as-is), replatforming (light changes for a new environment), refactoring (cleaning up code without changing behavior), rearchitecting (restructuring, often to microservices), or a full rebuild. The correct choice isn’t the same for every system – even within one application, different components often need different approaches.
What are the typical cost ranges, typical timelines, and what should I look for in a modernization partner?
Cost and timeline depend heavily on which approach a legacy app needs – a lift-and-shift can take weeks, a full re-architecture can take a year or more, and industry data shows the average large modernization program runs about 16 months. Rather than name a random number, we evaluate cost around our client’s system’s complexity, compliance needs, and chosen business strategy. When choosing a partner, look for a track record with systems as complex as yours, a phased delivery approach, transparent reporting, and AI approach that is both cost-efficient and responsible.
How does Euristiq use AI in legacy modernization?
AI supports our engineers at every stage – analyzing code and dependencies during assessment, accelerating refactoring and test generation during migration, and monitoring for issues after launch. Every AI-assisted output is meticulously reviewed by our team before it ships; we don’t treat AI as a replacement for engineering, just a way to move faster without cutting corners.

Let’s talk!

