IT consulting and software development company with 22 years in eCommerce, building enterprise solutions for B2B and B2C
Top Rated15+ YearsEnterprise
eCommerce DevelopmentMobile App DevelopmentTop 10 Elite
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Agencies 11–25
Strong contenders and rising stars
Modern consulting firm with Slalom Build practice specializing in digital product development and cloud-native application migrations.
Top Rated15+ YearsLarge Team
Cloud Migration & ModernizationApp Modernization & Legacy Migration
Cloud transformation specialist with AI-powered CONCIERTO platform for holistic migration across AWS, Azure, and Google Cloud platforms.
Top Rated15+ YearsMid-Size
Cloud Migration & ModernizationApp Modernization & Legacy Migration
Microsoft Solutions Partner specializing in application modernization, cloud migration, and AI/ML solutions with deep expertise in Azure and OpenAI technologies.
Top Rated15+ YearsLarge Team
App Modernization & Legacy Migration
Technology consulting company specializing in legacy application modernization with expertise in AWS, Azure, and GCP cloud migrations and proprietary AI-powered Code Explorer tool.
Top Rated15+ YearsLarge Team
App Modernization & Legacy Migration
Global IT services company providing legacy application modernization services for complex, business-critical systems with expertise in mainframe technologies and custom tool development.
Top Rated15+ YearsEnterprise
App Modernization & Legacy Migration
Healthcare-specialized cloud migration provider with HITRUST certification, focusing exclusively on healthcare and life sciences sectors.
Top Rated10+ YearsSmall Team
Cloud Migration & ModernizationApp Modernization & Legacy Migration
Mainframe modernization specialist providing 5X faster migration to Java with cloud-native applications and 65-85% cost savings.
Top Rated10+ YearsSmall Team
App Modernization & Legacy Migration
IT consulting firm specializing in legacy system modernization with expertise in code refactoring, containerization, cloud migration, and process automation for enterprise clients.
Top Rated15+ YearsMid-Size
App Modernization & Legacy Migration
Digital engineering company specializing in cloud, data, AI/ML, and custom software development including eCommerce platforms
Top Rated15+ YearsEnterprise
eCommerce DevelopmentCustom Software Development
Mainframe modernization specialist with JANUS Studio AI Platform for automated code conversion, refactoring, and documentation with 30 years of proven success.
Top Rated15+ YearsSmall Team
App Modernization & Legacy Migration
Mainframe modernization specialist focused on replatforming legacy applications to cloud-ready solutions with typical savings of 60-80%.
Top Rated15+ YearsMid-Size
App Modernization & Legacy Migration
IT services company providing legacy modernization with 400+ applications modernized across healthcare, financial services, and logistics sectors.
Top Rated15+ YearsMid-Size
App Modernization & Legacy Migration
Global consulting firm providing enterprise data, analytics, AI, and advanced analytics strategies with modern data foundations.
Top Rated15+ YearsEnterprise
Data Engineering & AnalyticsApp Modernization & Legacy Migration
Digital transformation company providing application modernization services with focus on continuous innovation, cloud-native technologies, and agile delivery.
Top Rated15+ YearsLarge Team
App Modernization & Legacy MigrationComplete Top 25 App Modernization & Legacy Migration Agencies
Full numbered list of all 25 agencies
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Complete Top 25 App Modernization & Legacy Migration Agencies
Full numbered list of all 25 agencies
- 1.Accenture — New Jersey
- 2.Cognizant — New Jersey
- 3.DXC Technology — Virginia
- 4.Hexaware — Georgia
- 5.IBM Consulting — New York
- 6.Itransition — Colorado
- 7.Kyndryl — New York
- 8.Mphasis — New York
- 9.NTT DATA — Texas
- 10.PwC — New York
- 11.ScienceSoft — Texas
- 12.Slalom — Washington
- 13.Trianz — California
- 14.WinWire Technologies — California
- 15.Improving — Texas
- 16.Luxoft — New York
- 17.Cloudticity — Texas
- 18.Heirloom Computing — California
- 19.Maxima Consulting — Illinois
- 20.Simform — Florida
- 21.TSRI — Washington
- 22.Astadia — Arizona
- 23.Damco Solutions — New Jersey
- 24.Protiviti — Illinois
- 25.CI&T — Texas
Trusted Rankings
Every agency on this list has been reviewed by our editorial team. Rankings are based on our transparent methodology which evaluates credibility, outcomes, and reputation.
No paid rankingsVerified credentialsUpdated regularly
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