BELITSOFT > Application modernization

Application Modernization | Cloud Modernization

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Contact Us If Your

current proprietary on-premises software developed in-house or purchased years ago is:

facing slow performance coupled with numerous update and support issues

incompatible with new features due to the outdated and unsupported tech stack

incomplete necessary functionality, even after upgrades (multilingual, mobile, etc.)

non-compliant with corporate policies and procedures (user privacy, security, accessibility, etc.)

company is forced to utilize several different systems and spreadsheets, resulting in:

a time-consuming manual multiple-step work process prone to human errors

a headache collecting, managing, and deciphering the data from disparate sources

holding back the system from advancing to the next level as your numbers are growing each year

the absence of ownership of adaptable all-in-one software with the opportunity to sell it to other organizations

Stay Calm with No Surprise Expenses

  • You get a detailed project plan with costs associated with each feature developed.
  • Before bidding on a project, we conduct a review to filter out non-essential inquiries that can lead to overestimation.
  • Weekly reports help you maintain control over the budget.

Don’t Stress About Work Not Being Done

  • We sign the Statement of Work to specify the budget, deliverables and the schedule.
  • You see who’s responsible for what tasks in your favorite task management system.
  • We hold weekly status meetings to provide demos of what’s been achieved to hit the milestones.

Be Confident Your Secrets are Secure

  • We guarantee your property protection policy using Master Service Agreement, Non-Disclosure Agreement, and Employee Confidentiality Contract signed prior to the start of work.
  • Your legal team is welcome to make any necessary modifications to the documents to ensure they align with your requirements.
  • We also implement multi-factor authentication and data encryption to add an extra layer of protection to your sensitive information while working with your software.

No Need to Explain Twice

  • We provide thought partnership to support your strategic thinking.
  • With just your minimal input, our team will leave no stone unturned.
  • You get your needs converted into a project requirements document that is easily understood by any engineer.

No Question Goes Unanswered

  • We are eager to explain how things work, not overwhelming you with technical buzzwords.
  • You will easily understand the technology and things behind the scenes.
  • So you can assign less technical staff to a project from your side.

Mentally Synced With Your Team

  • We create a hybrid composition with engineers working in tandem with your team members.
  • Work with individuals who comprehend US and EU business climate and business requirements.
8-hour operation
in European time
4-hour overlap
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We Guarantee Your Final App Modernization Budget
Accuracy up to 100% After Audit!

To make legacy software audit, we:

  • document how your existing software supports/doesn't support your current business and technical/security needs
  • investigate how the software landscape in your niche has changed, the modern solutions currently available, and those used by comparable organizations
  • propose the right delivery strategies, describing the potential benefits to key executives of your organization, and pitch them during a workshop

Remove the risks of project over-estimation and non-completion:

We overcome cost estimate uncertainty due to the detailed budgeting in the project planning phase and then define priorities for the development phase
Your project team gets a solution that meets both business and user needs and aligns with your technical and security requirements

Application modernization services offer solutions for moving legacy applications or legacy systems to newer ones while integrating new features to provide up-to-date functions for the business. A clear strategy is key for a successful application modernization that delivers obvious benefits, such as improved customer experience and ROI, through cloud advantages like speed, performance, scale, and new feature development.

Modernizing your old programs typically means rehosting, refactoring, replatforming, re-architecting or rebuilding them. Each of these modernization approaches has pros and cons as well as different costs, risks and time frames. That is the essence of the risk-return principle, and you have to balance between less effort and risks but more value and outputs. Conducting business and technical audits helps you find this golden mean in your modernization path.

Dmitry Baraishuk Belitsoft's CTO on


Application Modernization Services

Use Belitsoft’s application and cloud modernization services to improve your in-house app usage experience, covering fast performance, modern UI, smooth data access, up-to-date security and compatibility, and mitigation of support issues.

Application modernization consulting

Our team conducts detailed analyses of your legacy application, from code to infrastructure. We extract essential requirements and provide comprehensive recommendations to optimize your past investments.

Application modernization POC

We aim to reduce costs with app modernization and remove restrictions on legacy apps. By conducting a proof of concept, we can enhance your application's performance, introduce new functionality, and ensure effective scaling.

Legacy app migration to the cloud

Belitsoft applies different approaches to migrating applications to the cloud, depending on the specific requirements and business needs. Cloud migration services involve re-hosting the application, re-platforming it, or re-architecting it to suit the cloud environment better.

Application reengineering

We have a team of experts with diverse skills in legacy applications modernization. They take care of updating and making minor modifications to the code and design of your enterprise applications that have been running for a long time.

Application recoding

We can modernize your legacy systems that were built with outdated languages and platforms like PowerBuilder, Delphi, VB, C++, COBOL, or out-of-date technologies such as old versions of Java and .NET. To achieve this we use modern programming languages, frameworks, and databases.

Application containerization

We isolate your legacy applications or their components from each other at the operating system level, regardless of the modernization options chosen. This favors better portability, scalability, and performance consistency of the application.

Application Modernization Strategies We Use

Rehosting. This “lift-and-shift” modernization strategy emphasizes speed because it requires no code changes in practice. Organizations take legacy apps from their previous environment and transfer them as-is from their current environment, such as an on-premises server, to a more modern infrastructure, like a public cloud platform.

Refactoring. Refactoring prioritizes productivity and speed. It involves reorganizing and rewriting portions of the existing code app to enhance it for a new environment, typically cloud infrastructure. This process may engage a significant restructuring of the codebase to break down a monolithic application into microservices to achieve greater efficiency and scalability for your business processes.

Replatforming. This approach concerns making complementary updates to the existing code and architecture, rather than significant changes like in refactoring. It enables the legacy application to take full advantage of a modern cloud platform and improve performance or scalability.

Rearchitecting. This may be the most proper approach if an organization requires cloud scalability. It covers modifying and extending app functionality and code to improve scalability in the cloud.

Rebuilding. Rebuilding an app using cloud solutions may be necessary when existing apps have restricted functionality or a limited lifespan. This approach involves more effort, but it is crucial in the mentioned cases.

Key Technologies for Application Modernization

Cloud computing

Moving traditional applications to run on modern cloud environments: public, private, and hybrid clouds. Public cloud platforms refer to cloud services that are accessible over the internet and managed by third-party providers. Private clouds are cloud environments that are dedicated to a single organization and hosted either on-premises or by a third-party provider. Hybrid clouds refer to environments that combine elements of both public and private clouds, often integrated with on-premises environments.


A modern approach to packaging, deploying, and running applications and workloads in cloud environments. This technique benefits enhanced scalability, portability, and operational efficiency, which are especially well-suited for cloud infrastructure, along with multi-cloud and hybrid cloud environments. The containers streamline deployment and management through encapsulating applications in self-contained units to contribute seamless integration and easier scaling of resources.


An architectural approach that involves breaking down a complex system into smaller, more manageable parts that can operate autonomously while communicating with one another via application programming interfaces (APIs). By reducing dependencies between components, microservices enable teams to make updates and changes more quickly and efficiently.


This approach involves automating many of the operational tasks associated with containers, such as deployment, scaling, and networking. With automation and orchestration tools, developers can automate many routine tasks that would otherwise be time-consuming and error-prone. It allows them to focus on building and improving legacy apps and to ensure greater consistency, scalability, and reliability across development, testing, and production environments.


These are tools to facilitate the connection and communication between legacy applications, devices, and data across an organization's IT infrastructure. Integration through APIs helps streamline processes and workflows, saves time and increases cost efficiency that would otherwise be lost because of incompatible systems that can't communicate effectively.

AI and ML

Artificial Intelligence and Machine Learning enhance business processes and get abundant insights from their applications and data through personalization, predictive analytics, automated testing, and other methods.

Mobile Application Modernization Services

In response to fast-paced tech evolution, we offer timely updates and comprehensive app modernization services, including:

Feature development and design revamp. We develop new features to enhance your mobile app functionality and update the design for an improved user experience.
Performance optimization. If your app's performance is declining, we diagnose and fix issues to keep it running smoothly.
Codebase updates. To prevent loss of functionality or system incompatibility, we keep your app's codebase up-to-date as new technology emerges. We also ensure your app remains compatible with all devices and platforms.
Security and stability updates. Our comprehensive updates address common stability issues and integrate the latest security features.

Benefits of Application Modernization

API Integration

Accelerated Innovation and Time-to-Market

By reducing the resources needed to maintain apps and infrastructure, organizations can focus more on innovation. Cloud-based tools and services facilitate the development process, resulting in faster time-to-market.


Enhanced Security and Reliability

Adopting a cloud-first strategy allows organizations to leverage automatic updates and enhance security capabilities to protect their workloads. They benefit from built-in functionalities like automated tasks for high availability, disaster recovery, backups, and performance monitoring.


Compatibility and Agility

Modernizing apps not only ensures compatibility with the latest technology but also enables seamless function as technology evolves. This allows for swift updates and adaptations to meet current and future business requirements. It also facilitates automatic scaling to maintain optimal performance during demand spikes and reduce costs during demand drops.

API consulting


Thoughtful modernization of existing apps can be more efficient than creating new ones from scratch. In this way, organizations can build on existing investments instead of sinking time and money into something new. Additionally, app modernization maintains many current processes, promoting business continuity when compared to integrating entirely new apps into existing operations.

Application Modernization Process at Belitsoft

  • Discovery phase to deliberate the app modernization goals and plan a strategy. This involves exploring and evaluating existing apps and environments to prepare for transformation.
  • Detailed cost estimation of the entire app modernization project based on the results of the previous analysis.
  • High-level design to outline the overall architecture, technology stack, and key components.
  • Functional prototyping to show the core features of the final app.
  • Security review to ensure that the app meets industry standards and compliance requirements.
  • A detailed project plan outlining the resources, milestones, and timeline for the modernization project. We prepare technical documentation at this stage to describe the app's design, architecture, and implementation.
  • User acceptance testing to detect issues and fix them before moving to the next app modernization stages.
  • Modernization of the application and infrastructure, following our roadmap, to ensure everything works as scheduled.
  • QA and software testing to make sure the delivered application works as expected by making manual and automated tests.

300+ completed projects in various industries

Our Clients' Feedback


Azure-Based Application Modernization Solutions by Belitsoft

We perform application modernization services, including Azure cloud migration services, based on several Microsoft tools:

Azure Cosmos DB. Transform your scalable and high-performance apps with a fully managed NoSQL database service.

Azure Virtual Desktop. Facilitate a secure remote desktop experience accessible from almost anywhere.

Azure API Management. Accelerate your pace with cohesive API management throughout multi-cloud and hybrid environments.

Azure DevOps. Enhance your planning, collaboration, and shipping speed with a suite of contemporary development services.

Azure VMware Solution. Migrate or expand on-premises VMware environments to Azure.

Azure Kubernetes Services (AKS). Efficiently deployed and a service provider manages scale containers on Kubernetes.

Azure SQL Database. Develop scalable apps using cloud-based managed and intelligent SQL services.

Azure Web Application Firewall. Safeguard your apps using a full cloud-native web application firewall service.

Azure Machine Learning. Construct machine learning models at a significant scale, which are crucial to your business.

Google Cloud Application Modernization Solutions by Belitsoft

We perform application modernization services based on Google tools and technologies:

Hybrid and multi-cloud application platform Anthos. Develop and optimize apps flexibly and securely.

Cloud-native application development. Speed up your developers' productivity, simplify operations, and enhance security and include compliance in your software delivery process with Google Cloud's comprehensive platform.

Application development and delivery with serverless Cloud Run and Cloud Functions tools. Accelerate speed to market over a fully managed serverless environment.

DevOps. Increase software delivery velocity, improve the stability of software, and build highly secure shared ownership among software stakeholders.

Google Kubernetes containers. Migrate your application away from virtual machines and into native containers. Intelligently extract and convert apps from VMs to containers in Google Kubernetes Engine (GKE) or Anthos clusters without the VM layers (like Guest OS).

API management. Speed up application development with an API-first approach, using Google Cloud’s API management platform to manage all your APIs across hybrid and multi-cloud environments.

Mainframe modernization. Avoid money-consuming mainframe refresh cycle and business risk by modernizing your mainframe app quickly into containers in GKE. Innovate without constraints working with automated code refactoring tools beside advanced application discovery from Google.

Application Modernization Best Practices

Toward the challenges of application modernization, enterprises need to change their approach to modernizing applications. Here are some best practices recommended for creating a framework for modernizing mainframe applications.

Break up monoliths. To develop a mainframe application modernization framework, start a detailed roadmap to outline the intended organizational structure, servers, network configurations, storage configurations, and the application deployment on the servers. Break the roadmap down into components and model all networking between them. This makes clear creating a virtualized application environment applying tools such as open source, containers, and cloud APIs, and sets up to implement the approach to scale.

Untether applications and infrastructure. Make enterprise applications independent of the underlying infrastructure by separating them from all data sources, network, data, and security configurations. This enables application components to run anywhere, on any infrastructure, requiring no changes to the code. And ensures complete portability and eliminates vendor lock-in.

Lower cost of components. Applications go through different environments, versions, and deployments throughout their lifecycle in the organization. Splitting an application into its core components relieves the new versions design of the application as required. This speeds up the integration testing, migration, performance testing, and planning processes, and proceeds to significant time savings and cost efficiency.

Build application security into the entire application lifecycle. Plan for application security throughout the full service lifecycle, from design to development, including application modernization. This ensures the applications are secure from the deployment offset despite their infrastructure.

Manage with a modular view. A modular view of the application is central to the modernization process. It allows handling individual application components and testing them in a virtualized environment. This approach also helps enterprises remain independent of any infrastructure.

Our Team

For different stages and tasks of a project, we involve a team of senior performers with high expertise and experience.

Vladimir Tursin CEO/Co-Founder


Dzmitry Garbar Department Head/Partner


Alexander Kom Business Development Director


Alexander Kosarev Delivery Director/Department Head


Alexander Shestel Deputy Business Development Director


Denis Perevalov Head of .NET Department

Frequently Asked Questions

Without a discovery audit, any app modernization vendor can provide only a rough preliminary estimation based on your ideas and examples of similar projects.

It’s not accurate because Optimistic and Pessimistic calculations will differ by 100% and more, where Pessimistic is about estimation of complex unique functions, never developed before.

After the discovery audit, you will receive a detailed price range. We can then proceed on either a Fixed Price basis, with a 100% guarantee to stay within budget, or on a Time & Material basis, depending on your needs.

We use a Communication plan agreed with you.

The plan defines Project Roles - product owners from your side and project manager, business analyst, and technical lead from our side.

It also specifies overlapping hours and frequency of communication by email and through live meetings (demo meetings or meetings for discussion of the current project issues: status, new requirements, etc.).

We do Alpha testing during the development stage and Beta testing after the development with real users.

To start testing, we create a Test Plan and Product Acceptance Plan.

Test plan is modifying along with new features development.

Product Acceptance Plan is the main document for us to deliver you a workable solution.

We propose to use Git, GitLab or Bitbucket. We prefer to use Git but there isn't much difference between GitLab and Bitbucket.

We create and update the Software Requirement Specification (contains all planned and developed project features), Test Plan, and Product Acceptance Plan.

If needed, we create a User Manual for administrators and users of your software.

We sign an SLA to describe the process, including the duration, time for implementing enhancements of the software, and other nuances of our responsibilities in your particular situation.

Legacy applications refer to core programs written many years ago. These applications are the foundation of an organization's IT architecture and have been supporting it for decades. Although these applications are low maintenance and perform well, they quit matching the growing customers' needs. Through application modernization services, it can add new features without affecting the vital existing backend processes for the business. This modernization aims to bridge the gap between legacy systems and new technologies to enable innovation and success in the digital marketplace. Businesses can extract new value from their core IT investments with this process.

Application modernization is updating legacy applications by modernizing their platform infrastructure, internal architecture, and/or new functionality. The benefits of application modernization include faster delivery of new features, the ability to expose existing application functionality via API to other services, and the re-platforming of legacy applications from on-premises to the cloud for better performance and scalability.

You are likely to need application modernization services in case you’ve been using the following apps and data for years without doing significant improvements or upgrades:

  • Apps developed with .NET framework
  • Web apps running on Linux
  • Java-based apps
  • SAP applications
  • SQL databases

Application modernization is a safer option for enterprises than replacing their original applications with off-the-shelf alternatives that could compromise important data and workflows. This approach fails and creates financial losses for enterprises. A gradual modernization process can yield better returns on investment without disrupting operations. It is a crucial strategic business decision.

For many enterprises, application modernization services are the most practical approach to taking advantage of newer software platforms, tools, architectures, libraries, new security practices, virtualization, IoT, scalability requirements, and advancements in AI.

Legacy applications are often monolithic, which makes them difficult and expensive to update and scale. Modernizing a legacy software to a microservice's architecture can help address these challenges.

Instead of starting from scratch, organizations can modernize their existing apps. Moving their apps to the cloud in a "lift and shift" migration allows them to break modernization into stages and benefit immediately from basic cloud computing features. They can then proceed with more advanced modernization techniques, such as rebuilding parts of their legacy applications to incorporate advanced capabilities or best practices.

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