Application modernization services

Transform your legacy apps faster, more flexibly, and future-ready.

We provide application modernization services to transform outdated software into modern, cloud-ready solutions. Whether you need to rehost, refactor, or rebuild, our tailored strategies help reduce technical debt, enhance efficiency, and support your digital transformation goals.

Application modernization services provider company
Team

8+

Years of Expertise

Globe

350+

Our Global Clients

Tech mind

180+

IT professionals

Team Star

1000+

Completed Projects

\ Why We \

Why partner with celestial infosoft for system modernization

  • 8+ years in legacy system modernization & cloud-native transformation

  • Senior engineers with deep expertise in microservices, APIs, and DevOps

  • Full-stack modernization: rehost, refactor, replatform, re-architect

  • Proven delivery across BFSI, healthcare, retail, logistics & SaaS

  • Strategic cloud alliances: AWS, Azure, GCP certified experts

  • Agile sprints + CI/CD pipelines for faster, smarter delivery

  • Compliance-first approach: GDPR, HIPAA, PCI DSS, ISO-ready

  • Built-in performance, security, and scalability by design

\ Our Services \

Our application modernization services

Legacy Application Assessment & Strategy icon

Legacy Application Assessment

We begin every modernization project with a deep technical and business evaluation of your existing applications. This includes code analysis, infrastructure review, risk assessment, and identifying technical debt. The result is a clear, tailored roadmap to modernize your systems with minimal disruption and maximum ROI.

Cloud Migration Services

Cloud Migration & Modernization

We help you transition legacy applications to leading cloud platforms like AWS, Azure, and Google Cloud. Our approach isn’t just lift-and-shift; we optimize for cloud-native benefits like scalability, elasticity, performance, and cost-efficiency while ensuring data integrity and security throughout the migration.

Rehosting

Rehosting ("Lift & Shift")

For applications that need fast migration with minimal code changes, our rehosting solution is ideal. We move your legacy systems to a new infrastructure on-prem or cloud without modifying the core architecture, delivering quicker time-to-value with reduced risk.

Replatforming

Replatforming

This service focuses on upgrading the underlying platform (e.g., OS, database, web server) while retaining most of the application’s code. It’s perfect for boosting performance, enabling containerization, or adding modern monitoring tools without a full rebuild.

Refactoring & Re-architecting

Refactoring & Re-architecting

We rebuild legacy monoliths into modular, scalable, and maintainable applications using modern architecture patterns like microservices and serverless. This allows for better agility, easier updates, and long-term adaptability, especially in complex enterprise environments.

Design Systems & Style Guides

UI/UX Modernization

Outdated interfaces affect user trust and conversion. We redesign your application’s front-end using the latest UI/UX trends and frameworks to improve usability, responsiveness, and visual appeal without compromising backend stability.

API Integration & Enablement

API Integration & Enablement

This service focuses on upgrading the underlying platform (e.g., OS, database, web server) while retaining most of the application’s code. It’s perfect for boosting performance, enabling containerization, or adding modern monitoring tools without a full rebuild.

CD Pipeline Setup

DevOps Enablement & CI/CD

We rebuild legacy monoliths into modular, scalable, and maintainable applications using modern architecture patterns like microservices and serverless. This allows for better agility, easier updates, and long-term adaptability, especially in complex enterprise environments.

Legacy Data Modernization

Legacy Data Modernization

We help you cleanse, migrate, and restructure outdated data systems into modern, scalable databases or data lakes. Whether it’s relational, NoSQL, or cloud-native storage, we ensure your data is accessible, secure, and analytics-ready.

\ Our Portfolio \

Our Ecommerce Portfolio

Revamping E-commerce Platform with Microservices Architecture

Revamping E-commerce Platform with latest Microservices Architecture

Migration and Modernization for a Healthcare Provider

Seamless Cloud Migration and Modernization for a Healthcare Provider

Modernizing Legacy Financial System

Modernizing Legacy Financial Systems for Scalability and Compliance

\ Our Recognition \

Trusted and respected globally

Clutch Top developers badge 2022
Outsourcing 100 2024 Award
Inc 5000 2025 Award
Clutch Top 1000 companies 2023
Top Software developers 2022

\ Benefits \

Benefits of application modernization

Enhanced Performance & Scalability

Modernized applications are built to perform efficiently under increasing workloads. By leveraging cloud infrastructure, microservices, and optimized codebases, businesses can handle more users, process data faster, and scale on demand without compromising system stability.

Reduced Operational Costs

Legacy systems often require high maintenance, outdated hardware, and manual processes. Modernization eliminates these inefficiencies by moving to automated, cloud-based solutions, significantly cutting down on IT overhead, licensing fees, and support costs over time.

Improved Security & Compliance

Old systems can pose serious security vulnerabilities and struggle to meet modern compliance standards. Application modernization ensures your software is aligned with the latest security protocols, data privacy laws, and industry regulations like GDPR, HIPAA, and PCI DSS.

Faster Time to Market

By adopting agile development practices and modern CI/CD pipelines, updated systems allow teams to release features, patches, and enhancements faster. This agility enables businesses to respond quickly to market trends and customer feedback.

Better User Experience

A fresh user interface, responsive design, and smoother performance dramatically improve how users interact with your application. Enhanced UX leads to increased satisfaction, longer engagement, and stronger brand perception.

Future-Ready Architecture

Modern applications are built with flexibility in mind, making it easier to integrate with AI, machine learning, IoT, and other emerging technologies. This future-proof foundation ensures your digital ecosystem stays relevant and competitive in the long run.

What makes Celestial different

We achieve project success no matter what

To our clients, there is no middle ground. When it comes to your success, and it is our business to make it happen. We don’t stop till you meet every technical goal. We are here for you, and as your team, It’s our responsibility to understand and implement your requirements.

Man and Mountain

\ Few Words \

Clients who trust in our service

"The team’s transparent communication and agile delivery made the entire process seamless. Our new platform’s UI is far more intuitive, helping both customers and staff."

Sofia Alvarez Spain

"Celestial Infosoft's modernization efforts transformed our legacy systems completely. Our operational costs dropped significantly while user experience improved across the board."

Mitchell James UK

"Migrating to the cloud was daunting, but Celestial Infosoft handled every challenge expertly. We now scale effortlessly and launch updates rapidly, staying ahead in a competitive market."

Liam O’Connor Ireland

"The re-architecture of our legacy apps was complex, yet the Celestial team made it efficient and stress-free. Their expertise was crucial in modernizing our infrastructure."

Marie Dubois France

"We had critical security and compliance requirements. Celestial Infosoft ensured our systems met GDPR and industry standards, greatly enhancing our data protection."

Iqubal UAE

\ FAQs \

Frequently Asked Questions

Application modernization involves updating legacy software systems to modern architectures, such as cloud-native environments or microservices. This process enhances performance, scalability, and security, ensuring your applications meet current business needs and technological advancements.

The duration varies based on the complexity and scope of the project. On average, modernization can take from a few months to over a year. Factors influencing the timeline include the size of the application, the extent of re-architecture required, and the chosen modernization approach.

Common strategies include:

  • Rehosting (Lift and Shift): Migrating applications to the cloud without significant changes.

  • Replatforming: Making minimal changes to optimize applications for the cloud.

  • Refactoring: Rewriting parts of the application to improve performance and scalability.

  • Rearchitecting: Redesigning the application architecture to leverage cloud-native features.

  • Replacing: Replacing legacy applications with modern solutions.

The choice of approach depends on your business objectives, budget, and desired outcomes.

We implement robust security measures throughout the modernization process, including:

  • Secure Development Practices: Adhering to industry standards to prevent vulnerabilities.

  • Data Encryption: Encrypting data during transit and at rest.

  • Regular Audits: Conducting security assessments and penetration testing.

  • Compliance Adherence: Ensuring alignment with regulations like GDPR, HIPAA, and PCI DSS.

These practices safeguard your data and ensure compliance with relevant standards.

Absolutely! We encourage collaboration with your in-house IT team. Their insights into existing systems are invaluable. We work together to ensure the modernization aligns with your business goals and that knowledge transfer occurs seamlessly for ongoing support.

Every great project starts with a good conversation

We are curious to discuss your dream web project!

Consulatation