Many growing businesses depend on software that was developed years ago. These applications may still handle essential tasks, but outdated technology can make updates slower, integrations harder, and maintenance more expensive. As business requirements change, companies may need to modernize their existing applications instead of continuing to invest in systems that limit future growth.

Legacy application modernization services help businesses evaluate older software, improve its architecture, migrate workloads, and make applications easier to maintain. However, choosing a suitable technology partner requires more than comparing service lists. Businesses should consider technical expertise, project flexibility, industry experience, and long-term support.

Here are seven technology companies worth researching when planning an application modernization project in 2026.

1. SparxIT Solutions

SparxIT Solutions is a software development and technology services provider that businesses can evaluate for application development and modernization projects.

Companies considering a modernization initiative should discuss their existing architecture, business requirements, integration challenges, and plans for future maintenance with the provider.

For growing businesses, a clearly defined project scope can help keep modernization work aligned with operational needs and available resources.

Consider it for: Software development projects that require a tailored technical approach.

2. IBM Consulting

IBM Consulting works with enterprises on technology strategy, application transformation, and cloud-related initiatives. Its experience with enterprise technology environments can be relevant when older applications are connected to multiple

systems or support critical business processes.

Businesses should assess how its proposed approach fits their existing infrastructure and migration requirements.

Consider it for: Complex systems and enterprise modernization programs.

3. Accenture

Accenture provides technology consulting and digital transformation services across industries. Its modernization capabilities can support organizations evaluating application portfolios, updating software architectures, and moving workloads to modern

platforms.

Companies with several interconnected applications may benefit from establishing a phased roadmap before beginning implementation.

Consider it for: Large modernization initiatives involving multiple systems.

4. Capgemini

Capgemini offers consulting, technology, and engineering services that can support application transformation. Businesses can evaluate its capabilities when they need to update older applications while maintaining continuity across important operations.

A useful starting point is to identify which applications deliver the most business value and which create the greatest maintenance challenges.

Consider it for: Application transformation and technology consulting.

5. Cognizant

Cognizant provides IT consulting, application services, and digital transformation support. Organizations can explore its services when planning to improve legacy application performance, maintainability, and compatibility with newer technologies.

Before selecting a provider, businesses should ask how testing, data migration, system integration, and post-launch support will be handled.

Consider it for: Modernizing established business applications.

6. Deloitte

Deloitte offers technology consulting and transformation services that can help organizations connect technology changes

with wider business objectives. Legacy modernization may involve reviewing existing processes, managing implementation risks, and deciding how technology investments support long-term goals.

Businesses should establish measurable outcomes before starting a project, such as reduced maintenance effort, improved reliability, or faster release cycles.

Consider it for: Modernization projects connected to broader business transformation.

7. Infosys

Infosys provides IT consulting, application services, and digital transformation solutions. Organizations can research its capabilities when considering application upgrades, platform migration, or improvements to older software systems.

The scope of work should reflect the current condition of the application, the complexity of its dependencies, and the organization's future technology plans.

Consider it for: Enterprise application services and modernization initiatives.

How Much Does Legacy Application Modernization Cost?

The cost of modernization depends on the application's size, architecture, age, integrations, and business importance. A straightforward infrastructure migration may require less work than rebuilding an application with undocumented code and complex dependencies.

Common cost factors include:

• Application assessment: Reviewing the existing codebase, architecture, dependencies, and technical risks.
• Development work: Refactoring code, rebuilding features, or adapting applications to new platforms.
• Data migration: Moving and validating business data while preserving its integrity.
• Testing: Checking performance, security, integrations, and business functionality.
• Infrastructure: Paying for cloud services, hosting, software licenses, and related tools.
• Ongoing support: Maintaining the modernized application and addressing future requirements.

Businesses should request a phased estimate that separates assessment, implementation, testing, migration, and support. This makes it easier to compare proposals and identify costs that might otherwise be overlooked.

Modernization Strategies for Growing Businesses

The right strategy depends on whether the current application remains useful and how much change the business can accommodate.

Rehosting moves an application to new infrastructure with relatively few application changes. It can be appropriate when infrastructure is the main concern.

Refactoring improves the code structure while retaining much of the existing functionality. This can help make future updates easier.

Replatforming moves the application to a different platform with selected modifications.

Rebuilding creates a replacement when the existing architecture no longer supports business requirements effectively.

Replacing moves the organization to an existing software product when maintaining a custom application is no longer the best option.

Not every system needs a complete rebuild. In many cases, a phased approach allows businesses to address the most pressing risks first and spread implementation work over time.

What Should You Check Before Hiring a Modernization Partner?

Before choosing a legacy application modernization company, review its technical experience and proposed delivery process.

Ask potential providers these questions:

1. Have you worked with applications using our technology stack?
2. How will you assess undocumented code and existing dependencies?
3. What steps will you take to protect business data during migration?
4. How will the project minimize disruption to daily operations?
5. What testing and security checks are included?
6. Who will maintain the application after launch?
7. How will progress, costs, and project risks be reported?

Request a detailed proposal and relevant project examples. Compare the actual scope of work rather than relying only on company size or broad service descriptions.

Conclusion

Modernizing legacy applications can help growing businesses improve software maintainability, reduce technical debt, and prepare for changing operational requirements. The right approach depends on the application's current condition, the organization's budget, and the business outcomes it wants to achieve.

SparxIT Solutions, IBM Consulting, Accenture, Capgemini, Cognizant, Deloitte, and Infosys are potential providers to research. Compare their relevant expertise, proposed modernization strategies, project costs, and support arrangements before making a decision.

A practical modernization plan should begin with a clear assessment of existing software, prioritize the most important issues, and establish measurable goals for the project.