Legacy System Modernization

Transform outdated software into
future-ready solutions with Jmix AI

Key Business Triggers for Migration:

Rising maintenance costs, including ongoing license fees, and lack of skilled developers for old tech.

Security/compliance pressure (GDPR, ISO, OWASP), along with the growing need for regular vulnerability fixes and patching.

Desire to move to cloud-native or microservices architecture.

Users complaining about outdated UI and poor performance.

Need for faster delivery and CI/CD adoption.

Still running on Delphi, VB6 or PowerBuilder?

Tied to old Windows boxes, impossible to scale, and every small change takes forever – if you can even
find someone who still codes in it.

On Oracle Forms or COBOL for IBM mainframes?

The interface feels ancient, browser support is fading away, and the maintenance bill just
keeps climbing year after year.

Stuck with GWT, JSF or other dated front-ends?

Your apps look like they’ve not moved on since the 2000s, browsers keep breaking things, and developers are thin on the ground.

Is your architecture a spaghetti monster?

Multiple systems, duplicated logic, manual workarounds – no one’s really sure how it fits together, and adding new features feels like rolling the dice.

Running Java EE, Struts or a Spring MVC monolith?

Moving to the cloud is a nightmare, upgrades break half the system, and no developer wants to be the one maintaining it.

Do business changes take months to deliver?

The backlog grows, rivals outpace you, and management is losing faith in IT’s ability to keep up.

Still running on Delphi, VB6 or PowerBuilder?

Tied to old Windows boxes, impossible to scale, and every small change takes forever – if you can even
find someone who still codes in it.

On Oracle Forms or COBOL for IBM mainframes?

The interface feels ancient, browser support is fading away, and the maintenance bill just
keeps climbing year after year.

Stuck with GWT, JSF or other dated front-ends?

Your apps look like they’ve not moved on since the 2000s, browsers keep breaking things, and developers are thin on the ground.

Is your architecture a spaghetti monster?

Multiple systems, duplicated logic, manual workarounds – no one’s really sure how it fits together, and adding new features feels like rolling the dice.

Running Java EE, Struts or a Spring MVC monolith?

Moving to the cloud is a nightmare, upgrades break half the system, and no developer wants to be the one maintaining it.

Do business changes take months to deliver?

The backlog grows, rivals outpace you, and management is losing faith in IT’s ability to keep up.

Scalability. Flexibility. Efficiency.

Limitations
of Legacy Systems

Outdated Architecture

Difficult to maintain and evolve.
Unpopular Tech Stack

Hard to find specialists, high licensing costs.
No Downtime Allowed

You can’t simply replace the old system with a new one.
No Web Interface Support

Limited accessibility, no cross-platform capabilities, high maintenance complexity.

10 years

Maximum service life of corporate software.

15–20% annually

Year-over-year increase in
maintenance costs for
software older than three
years.

3–4 times more expensive

Maintaining outdated
software costs 3–4 times
more than developing a new
system.

Results of Legacy System
Modernization

Modern Architecture

Easier maintenance and future development.
Growth Opportunities

Process optimization and competitive advantage.
Popular Tech Stack

Reduced total cost of ownership.
Migration to Web Applications

Cross-platform access, fast delivery, easier adoption and support.

20–50%

Reduction in support and operational costs

200-320% ROI

Achieved over a 3–5 year horizon

Turn-key solution

Get fast results without distracting your team

Combined team

Flexible mixed teams with a perfect balance of business and technology experience

Component-based

Let us help deliver distinct functionality where it can add the most value

Choose your modernization scenario

“Big Bang”

Rollout a complete replacement system in one go. This is the most economic and cost-efficient approach, well suited for smaller less critical applications. Use Jmix reverse engineering capabilities, screens scaffolding, and ready-to-use add-ons to streamline the process.

TAB Bank Story

Gradual Replacement

Replace complex or mission-critical systems gradually to minimize disruption risks. Develop a new application with Jmix side-by-side with the legacy one, synchronizing data to keep both systems run in parallel. Sunset features one by one, until you can discontinue the whole old system.

CDER Story

ERP Extension

Use Jmix open architecture to introduce new business capabilities by means of standalone applications. Integrate new apps into existing IT landscape using API.

Ingenico Story

Estimate business outcomes
with the ROI Calculator

About Jmix

Jmix is an AI-enhanced less-code platform that helps modernize legacy systems on Java.

It combines visual development tools with Spring Boot flexibility, allowing teams to rebuild outdated systems gradually, without vendor lock-in or runtime fees.

Your organization keeps full control over the architecture, codebase, and future evolution.

Framework:

proven architecture based on
mainstream open-source technologies

Studio:

rapid development tools

Marketplace:

out-of-the-box add-ons for typical
business tasks

18 years

Est. 2008

International

Offices in the UK, Europe and worldwide

Used in

170+ countries

400+

enterprise projects completed

Millions

of end-users

25,000+

Java developers build apps with Jmix

Our solutions are used by

Why choose the Jmix team?

Specialized

Low risk migration via parallel running
High availability services
High load and hyper-scalable systems
Business Process Management
Complex real-time scheduling in logistics

Flexible

Fixed-price delivery, time-and-materials projects, and out-staffing
Co-development with your in-house team or full project ownership
Competitive rates optimized for long-term cooperation

Fast

Accelerate development with a mature, AI-enhanced full-stack Java framework
Work directly with the creators and core contributors of the platform
Proven experience building complex, scalable enterprise applications

Real outcomes. Real feedback

Mladen Bucan

Lead Software Developer, Pure Corporate Limited

Whenever I face a challenge I can’t solve on my own or need deeper expertise in the Jmix ecosystem, I turn to Jmix Consultancy Services. Every request has been handled quickly, efficiently, and with great accuracy. The Jmix team is highly professional and demonstrates not only strong knowledge of their own products but also a broad understanding of the wider software and IT industry. As a result, they truly understand my needs and tailor their services to deliver maximum value. My most recent request involved adding complex functionality to a platform add-on, and they not only delivered it seamlessly, but also agreed to include it in future releases, thus saving me from having to maintain it myself.

Balázs Bauer

Sales Director DSS Consulting zrt

Using Jmix technologies we could roll out features in days, not weeks.

Richard Milanovits

Project Manager at DSS Consulting zrt.

The flexibility of the Jmix platform, combined with the capabilities of the BPM Engine, allowed us to build a powerful, scalable system tailored to our specific needs. It empowered both our developers and business users alike.

Chee Keong Lee

Technical Director

Our original framework was client-server, which made deployment an issue for the client with more than 50 branches. We explored low-code solutions but they didn’t allow us to reuse existing Java and Oracle business logic. We also considered a SPA architecture with Angular and Java backend, but it required two different skill sets and teams—slowing development and increasing resource costs.

Robert Gilbert

Founder of Kargil Solutions

It’s much more powerful than any other framework I’ve seen in my life.

Mario Alberto
Medina Rojas

Outsourcing de Procesos,
Subgerente Técnico

Jmix played a central role in transforming how EIS Cúcuta manages its internal processes and MIPG requirements. Thanks to its powerful low-code backend and Java-friendly architecture, OPE Colombia was able to deliver a mission-critical government system with minimal resources, short timelines, and excellent end-user feedback.

Adam Steward

Web Developer, Bearex

Haulmont Technology successfully delivered the project according to the client's requirements. They were responsive to inquiries and displayed swift software development. The client was impressed with the team's expertise in Java libraries.

Thaer Tim

CEO, Qtes Soft

Haulmont Technology delivered the project on time and offered reliable development consulting support. The team ensured an efficient workflow through their prompt responses, supportiveness, and organized approach. Their extensive industry expertise was outstanding.

Mladen Bucan

Lead Software Developer, Pure Corporate Limited

Balázs Bauer

Sales Director DSS Consulting zrt

Using Jmix technologies we could roll out features in days, not weeks.

Richard Milanovits

Project Manager at DSS Consulting zrt.

Chee Keong Lee

Technical Director

Robert Gilbert

Founder of Kargil Solutions

It’s much more powerful than any other framework I’ve seen in my life.

Mario Alberto
Medina Rojas

Outsourcing de Procesos,
Subgerente Técnico

Adam Steward

Web Developer, Bearex

Thaer Tim

CEO, Qtes Soft

How we deliver

Trusted digital partner

We aim to establish a true partnership based on transparency and trust – not bureaucracy

AI-assisted delivery

We use Jmix AI, built on open and proven technologies, to accelerate analysis and modernization — while keeping decisions transparent, predictable, and fully controlled by your team.

Value-sighted

We try our best to become experts in your business so that we can deliver an outstanding solution that adds genuine enterprise value

Good project = live project

To us, a project is only successful when it produces code that is used, live in production – that’s why we develop rapid prototypes to ensure early value realization and concept validation

Frequently Asked Questions

Jmix Custom Development is our expert service that helps companies modernize their legacy applications. We migrate critical systems to a modern Java/Spring Boot stack using Jmix, combining platform tools with tailored project work.

Pricing depends on scope. We offer a fixed-price assessment and either fixed-budget or T&M contracts for later phases. - SHOULD BE AGREED ADDITIONALLY

We follow a hybrid approach: we keep what works, rewrite what needs modernization, and integrate everything into a cohesive architecture. This reduces cost, risk, and time compared to full rewrites.

Yes. Jmix supports REST, GraphQL, and custom APIs, enabling smooth integration with your enterprise ecosystem.

That is totally fine. Our team is expert in many technologies, we can help you anyway.

No. We transfer and optimize your business rules and workflows, so you retain the knowledge built into your legacy systems.

It depends on the size and complexity of your system. A typical migration takes 3–12 months. We start with an assessment to provide a phased plan and timeline.

We follow industry best practices (GDPR, ISO 27001, TISAX) and use secure migration pipelines to prevent data loss or leaks.

The main concern is downtime. We minimize it with parallel runs, gradual user switch-over, and automated regression testing. You can select the scenario of upgrade which is most suitable for you.

No problem. Jmix is an open-source framework under Apache 2.0. You can keep developing internally or with any vendor — we simply accelerate your migration and deliver a maintainable system.

Yes. We have helped banks, public sector organizations, and manufacturing companies migrate critical systems with zero data loss. See customer stories here.

Legacy System Modernization

Key Business Triggers for Migration:

Reduce modernization risks
with a clear roadmap

Scalability. Flexibility. Efficiency.