Boutique Salesforce consulting firm since 1997 with 75 onshore employees specializing in enterprise Salesforce deployment and customization.
Top RatedGoogle PartnerHubSpot Partner+5 more
Salesforce Consulting & DevelopmentLegacy ModernizationTop 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
DXC Technology
Virginia
NTT DATA
Texas
CGI
California
Hexaware Technologies
New Jersey
Persistent Systems
California
10Pearls
Virginia
Andersen
New York
Assembly
Florida
Cabot Technology Solutions
Massachusetts
Charter Global
Georgia
Damco Solutions
New Jersey
Devox Software
Florida
Door3
New York
Entrance Consulting
Texas
Maxima Consulting
Massachusetts
Agencies 26–50
Quality agencies for deeper exploration
Technology consulting and IT staff augmentation company specializing in custom software development, cloud computing, and AI solutions.
Top Rated15+ YearsMid-Size
Custom Software DevelopmentWeb Development
IT consulting company specializing in AI, data solutions, and digital transformation services globally.
Top Rated15+ YearsLarge Team
Data Engineering & AnalyticsLegacy Modernization
Software modernization company providing legacy system transformation with focus on agile methodologies and proactive, scalable solutions.
Top Rated15+ YearsMid-Size
App Modernization & Legacy MigrationLegacy Modernization
IT services company providing legacy system modernization and transformation with cloud migration and digital enablement expertise.
Top RatedGoogle PartnerAWS Partner+3 more
Legacy ModernizationCustom Software Development
Enterprise IT modernization company with automated software for mainframe and distributed system migrations to cloud platforms.
Top RatedGoogle PartnerMicrosoft Partner+2 more
Legacy Modernization
Software development company providing legacy modernization and migration services with phased approach minimizing business disruption.
Top RatedAWS Partner15+ Years+1 more
App Modernization & Legacy MigrationLegacy Modernization
Fujitsu is a global leader in digital services that transform organizations and the world around us. We aim to make the world more sustainable by building trust in society through innovation.
Top RatedGoogle PartnerAWS Partner+4 more
Legacy Modernization
World's largest IT infrastructure services provider offering mainframe modernization with AI and GenAI capabilities for hybrid cloud transformation.
Top Rated5+ YearsEnterprise
App Modernization & Legacy MigrationLegacy Modernization
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
Legacy software modernization company providing systematic transformation with cloud enablement and mainframe modernization services.
Top RatedGoogle PartnerAWS Partner+3 more
Legacy Modernization
Infrastructure and managed services provider offering DevOps consulting to accelerate software delivery and optimize cloud operations.
Top Rated15+ YearsEnterprise
DevOps & CI/CDAI/ML Development
IT consulting and solutions company providing application migration and modernization services for cloud transformation.
Rising StarGoogle PartnerAWS Partner+3 more
Legacy ModernizationAI/ML Development
Mainframe modernization specialist with JANUS Studio AI Platform for automated code conversion, refactoring, and documentation with 30 years of proven success.
Rising Star15+ YearsSmall Team
Legacy ModernizationCustom Software Development
Application modernization consulting company specializing in IBM Financial Transaction Manager implementations and payment system modernization.
Rising Star10+ YearsMid-Size
Legacy Modernization
Premier mainframe services provider for over 40 years specializing in mainframe-as-a-service and legacy modernization for mid-market customers.
15+ YearsSmall Team
Legacy Modernization
Veryant provides COBOL software solutions that help organizations maintain, modernize, and extend COBOL applications with portable, Java-based technology that lowers costs and improves performance.
15+ YearsSmall Team
Legacy ModernizationComplete Top 50 Legacy Modernization Agencies
Full numbered list of all 42 agencies
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Complete Top 50 Legacy Modernization Agencies
Full numbered list of all 42 agencies
- 1.Accenture — New Jersey
- 2.Capgemini — New York
- 3.Cognizant — New Jersey
- 4.Deloitte — New York
- 5.IBM Consulting — New York
- 6.Infosys — Texas
- 7.Astadia — Arizona
- 8.HCLTech — North Carolina
- 9.Luxoft — New York
- 10.Wipro — New Jersey
- 11.DXC Technology — Virginia
- 12.NTT DATA — Texas
- 13.CGI — California
- 14.Hexaware Technologies — New Jersey
- 15.Persistent Systems — California
- 16.10Pearls — Virginia
- 17.Andersen — New York
- 18.Assembly — Florida
- 19.Cabot Technology Solutions — Massachusetts
- 20.Charter Global — Georgia
- 21.Damco Solutions — New Jersey
- 22.Devox Software — Florida
- 23.Door3 — New York
- 24.Entrance Consulting — Texas
- 25.Maxima Consulting — Massachusetts
- 26.SingleStone Consulting — Virginia
- 27.Softura — Michigan
- 28.Softweb Solutions — Texas
- 29.Tech.us — Connecticut
- 30.XTGlobal — Texas
- 31.mLogica — California
- 32.AllianceTek — Pennsylvania
- 33.Fujitsu — Texas
- 34.Kyndryl — New York
- 35.Protiviti — Illinois
- 36.SparxIT — Massachusetts
- 37.TierPoint — Missouri
- 38.Boston Technology Corporation — Massachusetts
- 39.TSRI — Washington
- 40.Techzert — New York
- 41.BCL (Baer Consulting) — Colorado
- 42.Veryant — California
Top 50 Legacy Modernization Agencies — FAQ
Common questions about the best legacy modernization agencies.
Who is the #1 legacy modernization agency in the USA in 2026?
As of 2026, the top-ranked legacy modernization 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 legacy modernization agencies in the USA selected?
This list features 42 agencies selected from AgencyCluster's curated directory. Each agency was evaluated using the AgencyCluster Score (0–100), with particular weight on demonstrated expertise in legacy modernization. Only agencies with verified credentials are eligible, and rankings cannot be purchased. The agencies on this list average 32+ years of experience. For full methodology details, see our How We Rank page.
What should I look for when choosing a legacy modernization agency from this list?
Ask for case studies with measurable outcomes relevant to your specific project. Check team composition — do they have specialists or generalists? Ask about their communication cadence and project management approach. Request client references from companies of similar size and complexity to yours.
How much do the top legacy modernization agencies typically charge?
Project costs vary significantly based on complexity, team size, and engagement model. Request proposals from 3–5 agencies to benchmark pricing. Be cautious of quotes that are dramatically lower than others — they usually indicate corners being cut.
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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