Legacy software modernization services

Legacy system modernization treated as a business problem – not upgrade – and backed by value-focused, science-driven engineering, not shortcuts.
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20+

years of engineering

200+

successful .NET projects

4.9

rating on Clutch

We transform legacy applications, data, architectures, and infrastructure into reliable, maintainable systems – with over 20 years of experience, 300+ professionals, 270+ projects, and over 50 experts in math and physics. We migrate what’s important and preserve what works to prepare your operations to handle what’s next.

Don’t throw away decades of logic.

A free legacy assessment to start

Legacy holding you back?

The maintenance got tricky

The maintenance is taking more time and cost every year until keeping it alive starts blocking new initiatives.

The technology can’t keep up anymore

Old technology – frameworks, runtimes, and infrastructure – is making it hard to adopt modern capabilities.

The knowledge is trapped in code

Critical knowledge is buried in code and understood by few (and if they leave, it leaves with them).

The risks are rising

Old dependencies are making it hard to recover from incidents – and delay is getting more expensive from day to day.

Simple changes are causing big trouble

Small changes are taking more time and cost than ever and come with issues you aren’t prepared for.

Every integration is painful

Legacy architecture is getting in the way of new features – and getting it done just adds another workaround.

Legacy system modernization, measured

Healthcare
100×
faster request processing achieved through cloud migration
Read Case
Industrial

75% lower licensing costs
achieved through a modernization
of mathematically complex applications

Read Case
Telecommunications

<24 hours to support and debug an enterprise intranet network

Read Case
IT
10x
faster system upgrades,
80% fewer automation bugs
Read Case

Legacy software modernization services

Legacy assessment & roadmap

We assess your environment and define the strategy – from priorities to governance.

Code migration & refactoring

We reduce technical debt without losing business logic, through migration or refactoring.

Application re-architecture

We reshape rigid architectures into scalable, maintainable systems – from monolithic to microservices.

UI/UX modernization

We transform rusty interfaces into modern user experiences with scalability in mind.

Cloud migration

We transfer critical applications to modern cloud environments: Azure, AWS, and others.

Data migration

We move data carefully to preserve business rules, relationships, access, and integrity.

Legacy integration

We bridge legacy systems with tools and platforms we built around them.

Gradual modernization

We extend what works and replace what doesn’t without disrupting business operations.

Legacy app modernization strategies

Best when…
RehostYou need to get off an aging infrastructure at speed and with minimal changes.
ReplatformThe system is limited by platform or infrastructure but works well overall.
RefactorThe code is difficult to maintain or evolve but logic is sound.
RearchitectThe architecture is limiting current performance, development, integrations, or growth.
RebuildThe foundation is way too restrictive to evolve, and rebuilding is easier than patching.
ReplaceA modern SaaS or off-the-shelf solution can bring more benefit than maintaining your system.

 

AI engineering, with scientists in control

AI enters the stage to handle the repetition, from mapping the dependencies to generating the documentation. Our team is freed to make the decision.

AI does the legwork. We do the thinking.

AI development to take you further
plus

RAG systems

plus

AI agents

plus

Generative AI

plus

Multimodal AI

AI engineering to speed up modernization

Legacy technologies we modernize

Tech stack & standards

Backend

Backend

Frontend

Frontend

  • React
  • Angular
  • Vue
  • JavaScript
Infrastructure

Infrastructure

  • Azure
  • AWS
  • Docker
  • Kubernetes
  • Terraform
  • Jenkins
Database

Database

  • MS SQL
  • MySQL
  • PostgreSQL
  • Redis
  • Elasticsearch
  • MongoDB
Standards

Standards

  • HIPAA
  • GDPR
  • HL7
  • FHIR
  • CDA
  • DICOM
AI

AI

  • OpenAI
  • OpenCV
  • TensorFlow
  • Keras
  • PyTorch
  • Scikit-learn
  • NumPy
  • SciPy
  • LangChain
  • LangGraph

Case studies

VB6 to .NET migration

VB6 to .NET migration

Industry: Machinery

VB6, VBA, WinForms, MATLAB & AutoCAD → .NET framework

A complex engineering toolkit became difficult to maintain and dependent on already outdated technologies. We modernized its applications and merged the functionality while preserving critical logic and calculations within one modern platform.

The results we achieved:

  • 75% lower licensing costs
  • 6 specialized engineering modules
  • Modern stack
  • Cross-platform logic
Read full case study
VB6 to .NET migration
RPA modernization

RPA modernization

Industry: IT & technology

Legacy code → modular architecture

An enterprise RPA platform became complicated to maintain, unstable, inflexible, and expensive to upgrade. We modernized its architecture and introduced modular components while extending system compatibility and preserving backward compatibility.

The results we achieved:

  • 10x faster system upgrades
  • 80% fewer automation bugs
  • Modular architecture
  • Cross-platform toolkit
Read full case study

Cloud migration

Cloud migration

Industry: Healthcare

Web platform → cloud-native infrastructure

A popular fitness platform was outgrowing its architecture, which limited further expansion across platforms. We migrated the platform and transformed it into a customizable SaaS offering to expand customer reach, while extending its capabilities through iOS and Android apps and multiple third-party integrations.

The results we achieved:

  • 100× faster request processing
  • 1,000+ users supported concurrently
  • Cloud infrastructure
  • SaaS offering
Read full case study
Cloud migration
Intranet modernization

Intranet modernization

Industry: Telecommunications

PHP, JS & jQuery → Laravel, React

An enterprise intranet network became difficult to maintain, with limited core functionality across channels. We modernized the application and migrated key parts while extending the functionality with analytics, communication, collaboration, and even employee engagement.

The results we achieved:

  • <24 hours to support and debug
  • Multi-tenant workspace
  • PHP → Laravel modernization
  • JS & jQuery → React migration
Read full case study

Feedback from our client — 5.0 rating on Clutch

Abto was a major part of building our RPA platform — including 3 sub-products, engineering standards, CI/CD, and crisis support. The result: better customer satisfaction, fewer bugs, and less maintenance. Always on time, always a team player.

Read the full review

Adam Brooks
Director of Engineering, Nintex

Abto Software’s modernization framework

1
Assess
We dive into systems, data, dependencies, and processes to define the goals and create a roadmap.
2
Prove
We modernize one module or a representative workflow to validate the approach and prove functional parity.
3
Modernize
We migrate, refactor, rearchitect, or rebuild in increments.
4
Validate
We test data integrity, performance, integrations, and security.
5
Transition
We deploy the system and retire legacy components while handling the cutover and transferring the knowledge.
6
Evolve
We support the system and add new capabilities.

Modernization without big-bang risk

We understand before changing

We reverse-engineer legacy code and map existing dependencies before touching critical components.

We prove before expanding

Representative workflows, golden datasets, automated tests, functional parity – to preserve what matters.

Your business keeps running

Controlled increments, phased rollout, parallel operation, blue-green deployment – to minimize any disruption.

We validate every move

We verify data integrity, performance, integrations, and behavior at every single stage.

We transfer the knowledge

We turn undocumented logic into up-to-date handover materials to preserve business knowledge.

We build in security

Authentication, authorization, data protection, regulatory compliance – all built-in by design.

Modernizing systems that run your processes

Healthcare

  • EHR & EMR systems
  • CRM systems
  • Telemedicine platforms
  • Patient portals
  • Hospital information systems (HIS)
  • Laboratory information systems (LIS)
  • Practice management systems
  • Pharmacy management systems
  • Medical device software
  • Clinical decision-support systems

Retail

  • POS systems
  • CRM systems
  • E-commerce platforms
  • Pricing & promotion systems
  • Warehouse management systems (WMS)
  • Order management systems (OMS)
  • Store management platforms
  • Inventory management systems
  • Merchandising systems
  • Payment & checkout systems

Finance

  • Core banking
  • Payment processing
  • Loan origination systems
  • Loan servicing
  • Trading platforms
  • Underwriting platforms
  • Risk management
  • Fraud detection
  • Claims management
  • Account management

Manufacturing

  • ERP systems
  • CRM systems
  • Manufacturing execution systems (MES)
  • Manufacturing resource planning (MRP)
  • Warehouse management systems (WMS)
  • Quality management systems (QMS)
  • Product lifecycle management (PLM)
  • Supply chain management (SCM)
  • SCADA systems
  • CAD applications

Logistics

  • Warehouse management systems (WMS)
  • Order management systems (OMS)
  • Transportation management systems (TMS)
  • Customs & trade management systems
  • Fleet management platforms
  • Carrier management systems
  • Freight management systems
  • Route optimization systems
  • Dispatch & delivery platforms
  • Tracking & visibility platforms

Energy

  • Energy management systems (EMS)
  • Distribution management systems (DMS)
  • Outage management systems (OMS)
  • Meter data management systems (MDMS)
  • SCADA systems
  • GIS platforms
  • Asset management platforms
  • Grid management systems
  • Power plant control systems
  • Field service management systems

Start where you are

1
Assessment sprint
You get: A clear modernization roadmap before committing to transformation.
2
Fixed-scope pilot
You get: A working modernization approach to scale the transformation.
3
Full-cycle modernization
From assessment through migration, validation, rollout, and evolution – we take full ownership.

Hear from our clients

Ryan Fiorini
Ryan Fiorini linkedin
Co-Founder, CEO
https://blinkcns.com/

We had them on R&D projects we didn’t know how to move forward with. They not only created the work, it will be included in our patents. Abto turned our ideas into something tangible that we could use. We were so happy with their work that we decided to expand.

Christian Baumann
Christian Baumann linkedin
CEO
https://xa.com/

We rely a great deal on the IT services and expertise we receive from Abto. For us, it is one of our success factors to rely on a partner with a professional approach like Abto to be successful in our market segments.

Tony Clarey
Tony Clarey linkedin
VP of Business Development
https://euvic.com/

Abto Software meets the client’s expectations, and their end clients are satisfied with Abto Software’s work. They’ve established a personal relationship with the client that helps them resolve issues quickly. They maintain close communication with the client through Slack and in-person meetings.

Andreas Meier
Andreas Meier linkedin
Head of Product Development
https://enlotec.com/

We started to build a dedicated team in Lviv together with Abto Software 3 years ago. As a product vendor, we rely on resources that can build up knowledge about our products long-term. Abto was able to provide us with these services.

Philip Nussbaumer
Philip Nussbaumer linkedin
Head of Products
https://upgreat.ch/

Abto Software specialists developed a huge and extremely flexible SharePoint Client App for a Swiss customer providing various IT services, including the development of software based on SharePoint and its extensions.

Our partnerships and awards

FAQ

Each legacy modernization project is different in terms of size and complexity, and many other factors:

  • One module or workflow can take multiple months
  • Enterprise environments can take several years

We begin with determining your specific business needs to estimate required efforts and create a roadmap.

Your legacy modernization plan will differ depending on:

  • What needs to change
  • How much must stay
  • Target architecture
  • Data complexity, and many other factors

We begin with performing a careful code analysis to consider every nuance way beyond the technology.

We analyze existing applications, data, dependencies, and processes to define the goals and create a roadmap, then pick one module or a representative workflow to validate the approach before modernizing the system. We manage the transition and enable further evolution – all that while validating at every single stage.

We follow six stages:

  • Assess
  • Prove
  • Modernize
  • Validate
  • Transition
  • Evolve

The best modernization initiatives always start with discovery to understand the system and define the scope. Don’t treat modernization efforts as simple technology replacement – it is much more than moving the stack.

Our proven best practices:

  • Before modernizing legacy systems, you have to get an understanding of what you are working with
  • Always modernize legacy environments with growth in mind (from documentation to maintainability) – you build a foundation for future software engineering
  • Break down large efforts to minimize business disruption
  • Don’t forget about validation at every single stage
  • Data modernization is critical, not just an afterthought
  • Always preserve business logic, no matter the change

By moving legacy applications, you unlock multiple benefits:

  • A significantly smaller budget to maintain outdated systems
  • A considerably smaller effort to evolve outdated software
  • No more fragile dependencies – just stability and recoverability
  • Easily integrated third-party services (in particular cloud-native services)

With the right partner, you unlock huge potential.

When moving legacy infrastructure, you face several risks:

  • Data loss or corruption
  • Hidden dependencies
  • Functionality gaps
  • Broken integrations
  • Business disruption
  • Low performance, and more

That’s why it’s preferable to work with professionals.

Contact us

Tell your idea, request a quote or ask us a question
We take ownership to make it a success — because we build what we’re proud of.
Yuriy Kapkovskyy linkedin
Chief Sales and Marketing Officer, Co-owner
star star star star star 4.9/5
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