Legacy Application Modernization

Renew existing applications enhancing their functionality with no disruptions to the system. Make your legacy systems more agile and efficient, drive innovation, and reduce costs by modernizing your mission-critical applications with a dedicated technology partner.

How we work

End-to-end development

Custom application modernization services that cover project planning, validation, testing, and deployment.

Team extension

Our team of highly qualified engineers ensures timely project delivery with an exceptional level of quality.

Technology consulting

Validate your legacy transformation idea, receive the right technology strategy and a roadmap for the journey.

Legacy Application

Legacy to cloud migration

Start fixing your legacy issues by migrating applications to the cloud, which will enable microservices implementation and adopting a new technology stack.

Application re-engineering

Rebuild your legacy software preserving scope and restructure adding new microservices to gain high availability and scalability for your system.

Code refactoring

Optimize the existing code of your legacy applications without changing external functionality to reduce technical debt, improve performance and scalability.


Apply a more advanced approach to system modernization by rearchitecting software. Rewrite code and utilize the enhanced capabilities of a new tech stack.

In-place upgrades

With in-place upgrades update older legacy software to more current versions. Solve compatibility and system fragility issues and avoid risking security holes.

Legacy software maintenance

When there is a risk involved to interfere with the source code, software maintenance and ongoing support might be the most viable option.

Adapt, innovate, and deliver value faster by modernizing your legacy software.

Legacy Software Modernization Case Studies

A.S. Watsons

Technology Benefits of Application Modernization with Euristiq

High-performance solutions

We help companies to migrate to cloud with speed and scale, and to keep their applications evergreen, upgrading platform infrastructure and features. Engage an experienced technological partner to modernize your legacy apps and make them high-performing and scalable.

High-load systems

Our teams possess broad technological expertise to build high-load systems that support huge volumes of server requests, are fault tolerant, reliable and responsive. We are transforming legacy applications to ensure scalability, high-availability and zero downtime.

Multi-cloud expertise

Cloud migration might be the first but one of the most important steps in your legacy modernization journey. Our cloud experts are well versed in choosing and tailoring the best cloud platform to the unique needs of our clients – AWS, Microsoft Azure, or Google Cloud.

Security and data storage

Legacy systems with no longer supported software are less resistant to cyberattacks and malware. We protect enterprises from a negative impact of software security holes, building the cyber resilience they need to keep the system and its data protected from breaches.

UX/UI expertise

Validate your ideas at the early stages of the legacy transformation project to avoid ending up with an inefficient design that drives customers away. Our experts create the UI/UX design that helps cut delivery times, is adaptive, responsive and helps your business grow.

Center of tech excellence

Our experts use advanced technologies and the best practices to make legacy software more agile and efficient. We can assess your application and suggest the most fitting approach that will yield sustainable results – re-platforming, rearchitecting, or code refactoring.

Industries We Work With

Fintech & Banking

Keep pace with customer expectations and diminish cybersecurity risks introducing digital transformation to your aging legacy systems.

Airline Industry

Empower airline with new technology and legacy systems modernization to create exceptional air travel experiences for your customers.

Retail & Ecommerce

Unlock the potential of legacy systems modernization to meet consumer expectations for both online shopping and brick-and-mortar stores.

Transportation & Logistics

Access new capabilities in transportation and logistics services, lower maintenance and operational costs by modernizing legacy apps.

Healthcare & Hospitals

Digital transformation of healthcare solutions streamlines processes, makes better use of acquired data and increases patient care quality.

Energy & Utilities

Legacy transformation for electricity, gas, water and waste companies helps monitor resource usage, reduce consumption, and lower costs.

Real Estate

Modernization of real estate legacy systems will optimize processes, help gain efficiency and stay ahead in this highly competitive market.


Modernize agribusiness systems to diminish the technical debt, automate operations, optimize farming resources and decrease downtime.


Update your telecoms legacy systems that are too complex and require high maintenance costs with full network and digital transformation.

Looking for the right solution?

We modernize mission-critical software applications helping enterprises and small businesses from various industries save operational costs and enhance overall ROI. Reduce unexpected operational downtime, unlock higher operational efficiency and accelerate your business outcomes with a modernization approach for your legacy systems.

Reasons to Choose Euristiq for Legacy System Modernization

Digital transformation

We help our clients implement digital transformation, migrating to cloud, breaking down monolithic applications, and introducing microservices and multi-cloud containers. We reinvent their legacy applications fixing usability and user experience, which allows them to respond to customer demands and decrease time to market.

Performance boost for high-load systems

We possess extensive experience in re-engineering legacy core applications improving their interoperability and adding new features. Handling complex legacy application modernization, we focus on boosting performance to make it a few times faster which helps our clients beat the competition.

Costs reduction

We have a proven track record of delivering value to enterprises, improving their heavily loaded networks which are sensitive to changes in the firmware. Our domain knowledge allows us to bring high-performance, scalability, security and usability into legacy applications thus helping clients save 75% on maintenance costs.

Let's work together.

David O'Callaghan

Head of Development, Aviation Company

Euristiq provides top-tier developers that deliver high-quality output, which has supplemented a successful, multi-project partnership. Despite being remote, they are easily accessible.

Overall, it’s been a successful engagement.