Trusted by organizations modernizing legacy systems

Supporting projects across industries.

When modernization becomes a business priority

Common technical and operational challenges in legacy systems.
  • Dollar icon

    Rising maintenance costs

    Supporting older applications requires more time and resources, leaving less capacity for product improvements and new development.

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    Security and compliance requirements

    Unsupported platforms increase security risks and make regulatory compliance more challenging.

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    Legacy technology constraints

    Older platforms, including earlier .NET Framework versions, limit scalability and future upgrades.

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    Cloud adoption obstacles

    Outdated infrastructure creates barriers to cloud adoption and .NET modernization, limiting platform flexibility.

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    AI and integration initiatives

    Legacy systems slow the implementation of AI solutions and modern integration capabilities.

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    Limited visibility

    Technical debt, undocumented dependencies, and custom implementations make planning and estimation less predictable.

Legacy modernization for different business environments

Tailored to your organization's technology landscape.

  • SaaS platforms

    Growing SaaS products reach a point where the existing codebase slows further development. Modernization creates a more scalable foundation for new features and integrations.

  • Business-critical applications

    Systems that support essential operations require modernization with minimal disruption. Existing operations remain stable while modernization progresses in parallel.

  • Internal business systems

    Applications built around earlier business processes become difficult to maintain as organizations evolve. Modernization improves reliability, automates manual work, and supports changing operational needs.

Our legacy modernization services

Practical approaches to modernizing legacy applications across different technologies and architectures.
  • 01

    .NET Framework to modern .NET

    Upgrade unsupported .NET Framework applications to modern .NET while preserving existing business logic. Strengthen security and simplify ongoing maintenance.
  • 02

    Desktop to web application migration

    Transform Windows desktop software into modern web applications. Browser-based solutions provide easier access, centralized management, and greater flexibility.
  • 03

    Monolithic to modular architecture

    Introduce modular or microservices-based architectures where they provide measurable business value. Reduce technical complexity without rebuilding the entire application.
  • 04

    Cloud migration to Azure & AWS

    Move legacy applications to scalable Azure or AWS environments using a phased migration approach. Support higher availability, better scalability, and more efficient operations.
  • 05

    Legacy CMS modernization

    Replace outdated CMS platforms or upgrade unsupported versions to modern content management solutions. Protect existing content while making future updates easier to manage.
  • 06

    Application replatforming

    Move applications to modern technology stacks without a complete rewrite. Reduce implementation risk while retaining existing business functionality.

Choosing the right modernization strategy

The right strategy depends on your application's condition, business priorities, and technical constraints.

  • Upgrade

    Update frameworks, dependencies, or platform versions while preserving the existing application. The right choice when the technology stack is outdated but the solution continues to support business operations.

  • Refactor

    Improve code quality, maintainability, and performance without changing business functionality. The right choice when the application delivers value, but the codebase has become difficult to maintain or extend.

  • Replatform

    Move applications to modern infrastructure or cloud environments with minimal code changes. The right choice when the platform limits scalability, security, or operational efficiency.

  • Rebuild

    Redevelop applications on a modern technology stack while reproducing the capabilities your business relies on. The right choice when the existing architecture no longer supports future business requirements.

  • Replace

    Retire legacy software and introduce a new solution that better aligns with current business needs. The right choice when the cost and complexity of modernization outweigh the value of the existing solution.

Software modernization case studies

Examples of platform upgrades delivered by UKAD.

  • Image for Entitledto
    • Fintech
    • Government & Public Sector
    • Staff Augmentation and R&D
    • UK

    EntitledTo - an Online Benefit Calculator

    In an ever-evolving digital landscape, Entitledto has been a trailblazer in providing comprehensive online benefits calculators for the UK since 2000. By partnering with UKAD, they sought to enhance their platform's performance and accessibility, ensuring that millions of users could effortlessly navigate the complexities of the UK’s social security system.

    Read more
  • Image for GoalEnvision
    • AI Solutions
    • SaaS Platform
    • Stockholm, Sweden

    Goal Envision

    A legacy SaaS platform was rebuilt with .NET, Umbraco, React and Next.js to provide modern, AI-driven guidance for business growth. The upgrade gives users a clearer way to set goals, forecast development and review performance through clean, structured dashboards.

    Read more
  • Ginza 6
    • Ecommerce
    • Retail
    • Sweden

    Ginza - A Swedish Pioneer in Online Music Retail

    Discover the transformative journey of Ginza, Sweden's oldest music shop. This case study outlines their evolution from legacy systems to cutting-edge solutions, enhancing user experience and driving significant business growth.

    Read more
  • AJ Produkter casestudy
    • Retail
    • Ecommerce
    • Staff Augmentation and R&D
    • Halmstad, Sweden

    AJ Produkter's Decade-Long Partnership with UKAD

    For over a decade, AJ Produkter has collaborated with UKAD to revolutionize their digital landscape. By leveraging UKAD's expertise in Optimizely and React, this partnership has significantly boosted online sales and streamlined content management across 19 countries. Discover how a reliable Ukrainian tech partner has been instrumental in AJ Produkter's digital transformation and ongoing success.

    Read more
  • The image shows trucks with trailers parked outside a building labeled "WESTBAY".
    • Ecommerce
    • Sweden

    Westbay

    UKAD got a request on the development of the ecommerce website from a Swedish entrepreneur from the Automotive industry. He had been operating with an ecommerce website before, but it was outdated, complicated both to manage and use.

    Read more
  • UKAD Fractus
    • Logistics
    • Staff Augmentation and R&D
    • Stockholm, Sweden

    Transforming Ad-Hoc Logistics

    Fraktus, a leading shipping company from Stockholm, modernized its operations with the Adhoc System. This headless Vue.js platform streamlines non-standard cargo deliveries, improving efficiency and clarity while reducing the carbon footprint.

    Read more
See all cases

Why partner with UKAD

Engineering expertise and predictable delivery for complex legacy modernization projects.
  • Certificate Icon

    20+ years modernizing business-critical applications

    For more than 20 years, UKAD has delivered software modernization, cloud migration, and platform upgrade projects across industries. Experience with complex enterprise systems supports confident engineering decisions.

  • Magic Wand Icon

    Microsoft-certified .NET engineering teams

    Architects and developers deliver .NET modernization, cloud migration, and enterprise application development. Microsoft-certified engineers support every stage from planning to implementation. AI-assisted workflows accelerate code analysis and migration.

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    Phased delivery with reduced implementation risk

    Modernization projects are delivered in phases to minimize disruption to business operations. Each milestone is validated before moving forward, reducing implementation risk and providing greater project visibility.

Request an assessment

Application modernization services - from assessment to delivery

UKAD helps organizations assess existing systems, define the right approach, and prepare for successful implementation. Every project is aligned with business priorities, technical requirements, and long-term goals.

Starting a modernization project

From the first conversation to a clear delivery plan.
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  • Join exploration call | UKAD

    Discovery call

    We discuss your business goals, review the existing application, and identify technical constraints. This provides a clear understanding of the current environment before modernization begins.

  • Server + Bg

    Modernization strategy

    Based on the assessment, we recommend the most suitable strategy, whether it involves upgrading, refactoring, replatforming, rebuilding, or replacing the application.

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    Phased implementation

    Modernization is delivered incrementally to reduce disruption and validate results throughout the project. Each stage is completed before moving to the next.

  • Quality Assurance icon

    Ongoing support & optimization

    After delivery, we continue supporting and optimizing the application as business and technology requirements evolve.

Talk to our experts
Looking for broader .NET expertise?

From custom software and enterprise integrations to AI-powered applications, we build scalable .NET solutions.

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Client testimonials

Perspectives from engineering teams and business leaders who have worked with UKAD.
  • Read more about the case study AJ Produkter
    Read customer story Arrow pointing right for link text

    "The ecommerce platforms have expanded significantly in a short period, resulting in success for the company. A steady partner in this multiyear engagement, UKAD has provided consistent dedication and enthusiasm to the project."

    Paivi Wahlqvist
    Päivi Wahlqvist
    Head of E-Commerce
  • Read more about the case study Whiteport
    Read customer story Arrow pointing right for link text

    "We've been working for five years and we never missed the deadline. I want to keep these guys forever working with me."

    Marten Angner | UKAD
    Mårten Angner
    UX-designer
  • Read more about the case study ContentTap
    Read customer story Arrow pointing right for link text

    "The product has been a resounding success. UKAD’s openness complemented their collaborative and professional management style. Their dedication and responsiveness to the project were also noteworthy. Expect a team that provides quality work and is willing to take on any challenge."

    Alex Lehmberg
    Alex Lehmberg
    Startup CTO, software architect and developer
  • Read more about the case study Scandinavian Photo
    Read customer story Arrow pointing right for link text

    "UKAD’s efforts have increased user engagement and improved conversion rates. The team demonstrates strong organizational skills and adheres to the project timeline meticulously. They have a clear understanding of the client's business needs, ensuring that goals are aligned."

    Oscar Levandowski Scandinavian photo company
    Oscar Levandowski
    Development Manager
  • Read more about the case study Entitledto
    Read customer story Arrow pointing right for link text

    "The team at UKAD has widespread in-house expertise. Their ability to scale and adapt to changing projects makes them stand out. They will work weekends to ensure deadlines are met, and consistently go the extra mile."

    Dr. Phil Agulnik
    Dr. Phil Agulnik
    Founder
  • Read more about the case study Ginza
    Read customer story Arrow pointing right for link text

    "Prompt and helpful in software development projects. High skills in .Net and web development. Very professional."

    Johan Sävenstrand
    Johan Sävenstrand
    Ecommerce Manager & CTO
  • Read more about the case study Electra
    Read customer story Arrow pointing right for link text

    "Satisfaction guaranteed - is definitely something that is fulfilled by the team we've worked with at UKAD. They are committed and eager to deliver a product that one can be proud of by close communication and tight debriefs - regardless of the distance."

    Norah Guzlander | UKAD
    Norah Guzlander
    Web Designer
  • Read more about the case study Tangy Market
    Read customer story Arrow pointing right for link text

    "No doubt, UKAD has a team of strong developers capable of performing very well. UKAD’s app is flawless, stable, and easy to use on any device. The team was able to create a unique trading experience and a new way to interact with music. The process was seamless between companies and the cooperation was executed smoothly."

    Olga Stern Tangy Market | UKAD
    Olga Stern
    Development Manager

  • "Through the years, UKAD has remained a reliable and competent software partner. Their work is technically sound, their project management is efficient, and their communication is fluid and thorough. The team excels at finding effective, customized solutions."

    Pontus Rosin
    Pontus Rosin
    Owner, Adeptic Technologies AB
1 — 3

Get in touch

Planning to modernize an existing application? Let’s discuss the next step.

Insights and articles

Practical guidance, technical insights, and updates from the UKAD team.

  • Microsoft
    AI Solutions • Awards
    4 mins

    UKAD achieves Solutions Partner designation in the Microsoft AI Cloud Partner Program

    • By

    UKAD has achieved the Solutions Partner for Digital & App Innovation (Azure) designation within the Microsoft AI Cloud Partner Program. This recognition highlights our expertise in Azure-based solutions, from custom application development to AI-driven cloud innovations. We ensure high-quality, scalable, and future-proof software with a team of certified Microsoft developers. Get in touch with UKAD today!

  • Managing Legacy Infrastructure Through Natural Language
    Web Development • AI Solutions • DevOps
    7 mins

    Managing Legacy Infrastructure Through Natural Language: IIS and Agentic AI

    • By

    Most of our projects have adopted containerization and cloud technologies. But in  reality, many legacy systems still run on bare-metal infrastructure. Sometimes because of strict security requirements, specific dependencies, or simply the cost and risk of migration. Now, we're talking about IIS (Internet Information Services) - Microsoft's web server that is still widely used in corporate environments. The problem is that managing such systems often requires direct server access, which creates a barrier for developers and increases operational complexity.

  • Iso Hero
    Awards
    5 mins

    UKAD Achieves ISO/IEC 27001:2022 Certification

    • By

    UKAD has officially achieved ISO/IEC 27001:2022 certification after a year of dedicated effort. This milestone strengthens our commitment to secure software development, giving clients confidence in protecting their data, managing risks, and delivering projects with transparency and trust.

  • UKAD Team
    Staff Augmentation
    3 mins

    UKAD at the Finnish-Ukrainian Tech Day: A recap of the conference in Espoo

    • By

    On May 30th, our team from UKAD had the pleasure of attending the Finnish-Ukrainian Tech Day in Espoo, Finland. The event brought together leaders and innovators from the tech industries of Finland and Ukraine. The aim was to foster collaboration and share insights on AI, software development, and growing businesses. Advicera OY organized the conference in partnership with the City of Espoo. It was an excellent chance to expand our network, gain new perspectives, and find new paths for innovation.

  • Exploring The Power Of Microservices Architecture
    Web Development
    5 mins

    Exploring the Power of Microservices Architecture

    • By

    In the ever-evolving landscape of information technology, staying ahead of the curve is essential for any company seeking to provide innovative and efficient solutions. One such groundbreaking concept that has gained immense popularity is the microservices architecture

Legacy application modernization FAQ

Answers to common questions about upgrading old systems.

  • Project duration depends on the size and complexity of the application, as well as the chosen approach. The table below provides estimated timelines for common engagement types.

    Service

    Estimated timeline*

    Modernization assessment

    2-4 weeks

    Application upgrade

    1-2 months

    .NET modernization

    2-4 months

    .NET cloud migration

    2-4 months

    Full application redevelopment

    3-6+ months

    *Delivery timelines vary depending on the application, project scope, and business requirements.

  • Not every legacy application requires a complete rebuild. Depending on its technical condition, business value, and future requirements, modernization may involve upgrading, refactoring, replatforming, or rebuilding selected components. We help determine the most suitable strategy before implementation begins.

  • The assessment provides a clear understanding of your application's condition, technical risks, and modernization opportunities. It includes recommended modernization strategies, estimated effort, implementation priorities, and practical next steps.

  • Business continuity is a key consideration throughout the project. Delivery is organized in phases, allowing existing applications to remain operational while new functionality is introduced gradually. Where appropriate, we use staged deployments, parallel environments, and rollback strategies to reduce implementation risk.

  • Yes. We routinely work with applications built on legacy .NET Framework, older Umbraco versions, and aging software platforms. Depending on the project, we help organizations migrate to Azure, adopt modern .NET, and transition to cloud-based architectures.

  • Yes. We modernize legacy .NET applications by upgrading older .NET Framework versions, migrating applications to modern .NET, and supporting cloud migration where appropriate. Our certified Microsoft developers deliver projects ranging from targeted platform upgrades to large-scale modernization initiatives.

  • The cost depends on the size and complexity of the application, its technical condition, and the chosen approach. Projects involving architecture changes, cloud migration, or full redevelopment typically require more effort than targeted upgrades.

    The table below provides indicative investment ranges for common modernization scenarios.

    Project type

    Estimated investment*

    Application upgrade

    $5,000-15,000

    .NET modernization

    $10,000-25,000

    .NET cloud migration

    $20,000-40,000+

    Full application redevelopment

    $50,000+

    *Estimated investment ranges. Final pricing depends on the application, project scope, and assessment results.