Infrastructure and managed services provider offering DevOps consulting to accelerate software delivery and optimize cloud operations.
Top Rated15+ YearsEnterprise
DevOps & CI/CDAI/ML DevelopmentTop 10 Elite
The very best • View detailed Top 10
Agencies 11–25
Strong contenders • View detailed Top 25
#11
#12
#13
#14
#15
#16
#17
#18
#19
#20
#21
#22
#23
#24
#25
Door3
New York
Innowise
Georgia
Protiviti
Illinois
Andersen
New York
Charter Global
Georgia
The Intech Group
Florida
The Provato Group
Illinois
Hexaware
Georgia
Improving
Texas
Innova Solutions
Georgia
Mphasis
New York
NTT DATA
Texas
Presidio, Inc.
New York
SaM Solutions
South Carolina
Sparq
Georgia
Agencies 26–50
Quality agencies for deeper exploration
Microsoft Solutions Partner specializing in application modernization, cloud migration, and AI/ML solutions with deep expertise in Azure and OpenAI technologies.
Top RatedGoogle PartnerAWS Partner+3 more
App Modernization & Legacy MigrationCustom Software Development
International software company with 6000+ engineers providing legacy application modernization with meticulous talent curation and 100+ specialized teams.
Rising Star15+ YearsEnterprise
App Modernization & Legacy Migration
Cloud transformation specialist with AI-powered CONCIERTO platform for holistic migration across AWS, Azure, and Google Cloud platforms.
Rising StarGoogle PartnerAWS Partner+3 more
Cloud Migration & ModernizationApp Modernization & Legacy Migration
IT services company providing mainframe modernization solutions with expertise in cloud integration, business intelligence, and hybrid cloud strategies.
Rising Star15+ YearsMid-Size
App Modernization & Legacy Migration
IT solutions company providing cloud migration and application modernization services across Virginia, Texas, California, and New York locations.
Rising StarSalesforce Partner15+ Years+1 more
App Modernization & Legacy MigrationAI Chatbot Development
Technology consulting company providing software and systems engineering services to government agencies and businesses with application modernization expertise.
Rising StarGoogle PartnerAWS Partner+3 more
App Modernization & Legacy Migration
Cloud consulting and migration services provider with presence across 15+ US states offering legacy application modernization and iPaaS solutions.
Rising Star15+ YearsLarge Team
App Modernization & Legacy Migration
Custom software development company offering data analytics, engineering, and AI-driven business solutions.
Rising Star15+ YearsEnterprise
Data Engineering & AnalyticsAI/ML Development
Cloud migration and modernization platform company providing unified workload mobility across AWS, Azure, Google Cloud, and hybrid environments.
Rising StarGoogle PartnerAWS Partner+3 more
App Modernization & Legacy Migration
Software modernization company providing legacy system transformation with focus on agile methodologies and proactive, scalable solutions.
Rising Star15+ YearsMid-Size
App Modernization & Legacy MigrationLegacy Modernization
Software development company providing legacy modernization and migration services with phased approach minimizing business disruption.
Rising StarAWS Partner15+ Years+1 more
App Modernization & Legacy MigrationLegacy Modernization
Mainframe modernization specialist focused on replatforming legacy applications to cloud-ready solutions with typical savings of 60-80%.
Rising Star15+ YearsMid-Size
App Modernization & Legacy MigrationLegacy Modernization
Microsoft Gold Partner providing enterprise application modernization with focus on Azure, containers, DevOps, and cloud connectivity.
Rising Star15+ YearsMid-Size
App Modernization & Legacy Migration
IT services company providing legacy application modernization with expertise in data migration, cloud solutions, and process automation.
Rising Star15+ YearsMid-Size
App Modernization & Legacy Migration
Mainframe modernization specialist providing 5X faster migration to Java with cloud-native applications and 65-85% cost savings.
Rising Star15+ YearsSmall Team
App Modernization & Legacy Migration
IT consulting firm specializing in application modernization helping businesses transition from legacy systems to modern, cloud-based solutions.
Rising StarAWS PartnerMicrosoft Partner+2 more
App Modernization & Legacy Migration
2022 Salesforce.org Consulting Partner of the Year - Education with 950+ implementations across higher education, nonprofit, and public sectors.
Salesforce Partner15+ YearsLarge Team
Salesforce Consulting & DevelopmentApp Modernization & Legacy Migration
Global technology company driving continuous modernization through CloudSMART strategy and AI Force platform for automated code refactoring.
Google PartnerAWS PartnerMicrosoft Partner+2 more
Legacy ModernizationAI/ML DevelopmentComplete Top 50 App Modernization & Legacy Migration Agencies
Full numbered list of all 44 agencies
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Complete Top 50 App Modernization & Legacy Migration Agencies
Full numbered list of all 44 agencies
- 1.Accenture — New Jersey
- 2.Cognizant — New Jersey
- 3.IBM Consulting — New York
- 4.Kyndryl — New York
- 5.PwC — New York
- 6.ScienceSoft — Texas
- 7.Slalom — Washington
- 8.Cloudticity — Washington
- 9.Maxima Consulting — Massachusetts
- 10.Appinventiv — New York
- 11.Door3 — New York
- 12.Innowise — Georgia
- 13.Protiviti — Illinois
- 14.Andersen — New York
- 15.Charter Global — Georgia
- 16.The Intech Group — Florida
- 17.The Provato Group — Illinois
- 18.Hexaware — Georgia
- 19.Improving — Texas
- 20.Innova Solutions — Georgia
- 21.Mphasis — New York
- 22.NTT DATA — Texas
- 23.Presidio, Inc. — New York
- 24.SaM Solutions — South Carolina
- 25.Sparq — Georgia
- 26.TierPoint — Missouri
- 27.WinWire Technologies — California
- 28.Euvic — New Jersey
- 29.Trianz — California
- 30.TAFF Inc — Florida
- 31.USM Business Systems — Texas
- 32.Applied Information Sciences (AIS) — Virginia
- 33.Compunnel — New Jersey
- 34.Itransition — Georgia
- 35.RiverMeadow — California
- 36.Tech.us — Connecticut
- 37.AllianceTek — Pennsylvania
- 38.Astadia — Arizona
- 39.Imaginet — Texas
- 40.ePathUSA — Virginia
- 41.Heirloom Computing — California
- 42.Techminds Group — New Jersey
- 43.Attain Partners — Virginia
- 44.HCLTech — North Carolina
Top 50 App Modernization & Legacy Migration Agencies — FAQ
Common questions about the best app modernization & legacy migration agencies.
Who is the #1 app modernization & legacy migration agency in the USA in 2026?
As of 2026, the top-ranked app modernization & legacy migration agency in the USA on AgencyCluster is Accenture, with an AgencyCluster Score of 100/100. Rankings are based on verified evidence across credibility, proof of work, reputation, category specialization, delivery maturity, and freshness. Rankings are updated periodically as new evidence becomes available.
How were the top 50 app modernization & legacy migration agencies in the USA selected?
This list features 44 agencies selected from AgencyCluster's curated directory. Each agency was evaluated using the AgencyCluster Score (0–100), with particular weight on demonstrated expertise in app modernization & legacy migration. Only agencies with verified credentials are eligible, and rankings cannot be purchased. The agencies on this list average 27+ years of experience. For full methodology details, see our How We Rank page.
What should I look for when choosing a app modernization & legacy migration agency from this list?
Ask about their assessment methodology — how do they decide what to refactor vs. rebuild vs. replace? Check their experience with your legacy technology (COBOL, .NET Framework, monolithic Java, etc.). Ask about their strangler fig or incremental migration approach. For large systems, ask about their risk mitigation and rollback strategy.
How much do the top app modernization & legacy migration agencies typically charge?
Legacy assessment and modernization roadmap costs $20K–$60K. Application modernization projects range from $75K–$500K+ per major system. Enterprise modernization programs can span $500K–$2M+ across multiple systems.
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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