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Moving workloads to the cloud can solve major infrastructure problems—but the migration itself can create new ones if it is treated as a simple technology transfer. Legacy dependencies, sensitive data, outdated applications, unexpected cloud costs, security gaps, and downtime can all turn a seemingly straightforward migration into a business-critical project. The right cloud migration service provider needs to address not only where workloads are moved, but also how applications, data, security, costs, and operations will work afterward.
This is why choosing among cloud migration companies requires looking beyond platform certifications or a list of migration tools. Businesses need to understand what each provider actually delivers, which cloud platforms and workloads it supports, how much engineering is involved, and whether it can provide ongoing support after go-live.
The cloud migration companies list below is designed to help businesses distinguish between large global consultancies, cloud-focused providers, and engineering partners before starting a migration project. This article compares 10 providers by their service model, cloud platform coverage, industry focus, and typical fit. It also explains what cloud migrationsolutions can include, how consulting differs from full-service migration, what to ask potential providers, and which factors matter when planning a migration in 2026.
Cloud migration companies plan and execute the movement of business applications, infrastructure, and data into cloud environments while addressing architecture, security, continuity, and post-migration operations.
A cloud provider such as AWS, Microsoft Azure, or Google Cloud supplies the underlying platform; a migration partner is responsible for determining what should move, how it should move, and what needs to change along the way. That can include assessing existing infrastructure, mapping application dependencies, designing the target cloud architecture, migrating databases and workloads, testing the environment, managing cutover, and optimizing the resulting infrastructure.
The scope varies considerably between providers. Some focus primarily on cloud consulting and migration planning, while others combine migration with software engineering, application modernization, security, DevOps, and managed services.
Common migration scenarios include:
The difference matters because a straightforward infrastructure move may require very different technical capabilities from a mission-critical application modernization or multi-cloud transformation. NIX United, for example, currently supports migrations involving AWS, Azure, Google Cloud and IBM Cloud, including platform-to-platform migration, legacy modernization, hybrid environments, and application and data migration.
We evaluated each provider across five criteria: company type, headquarters, founding year, cloud platform coverage, and industry focus. Platform coverage reflects the clouds for which the provider publicly demonstrates migration or cloud capabilities, rather than simply listing a technology on its website.
NIX United is the author of this guide and is included in the ranking; the same criteria are disclosed above and applied equally to every company.
This list fits for full-cycle cloud migration for mid-market and enterprise buyers, not by company size or revenue. The ranking therefore does not imply that a larger consultancy is universally better suited to a particular migration project; the appropriate choice depends on workload complexity, internal capabilities, cloud strategy, industry requirements, and the desired level of engineering involvement.
The companies below differ in cloud platforms, migration capabilities, industry expertise, and the level of support they provide throughout the migration lifecycle. This comparison highlights their core strengths and typical use cases to help businesses identify providers that fit their cloud migration strategy and requirements.
#
Company
Type
HQ
Founded
Cloud platforms
Industry focus
Best for
1
NIX United
Full-cycle software engineering and cloud services provider
Tampa, FL, US
1994
AWS, Azure, Google Cloud, IBM Cloud, and others
Cross-industry
Businesses that need migration, application modernization, and ongoing engineering from one partner
2
Accenture
Global professional services and technology company
Dublin, Ireland
1989
AWS, Azure, Google Cloud, and broader cloud ecosystem
Cross-industry, large enterprises
Large organizations running complex, multi-year cloud transformation programs
3
IBM
Global consulting and technology services provider
Armonk, NY, US
1911
IBM Cloud, AWS, Azure, Google Cloud, Oracle Cloud
Financial services, government, healthcare, enterprise
Enterprises with complex hybrid, legacy, and multi-cloud environments
4
Cognizant
Teaneck, NJ, US
AWS, Azure, Google Cloud
Banking, healthcare, insurance, and other industries
Large enterprises combining cloud migration with application and infrastructure modernization
5
Capgemini
Global consulting, technology, and engineering services company
Paris, France
1967
Financial services, public sector, regulated enterprises, cross-industry
Enterprises requiring cloud transformation with strong governance, security, and modernization capabilities
6
Slalom
Business and technology consulting company
Seattle, WA, US
2001
Organizations where cloud migration is part of a broader business and organizational transformation
7
Andersen
Global software development and IT consulting company
Warsaw, Poland
2007
AWS, Azure, Google Cloud, plus other providers
Mid-market and enterprise businesses seeking migration combined with software engineering
8
Simform
Digital engineering and cloud services company
Orlando, FL, US
2010
AWS, Azure, Google Cloud capabilities
Healthcare, fintech, SaaS, retail, and other industries
Product and enterprise teams combining cloud migration with modernization and engineering
9
Mission
AWS-focused cloud consulting, migration, modernization, and managed services provider; a CDW company
US
2017
AWS
Cross-industry, with strong AWS specialization
Organizations committed to AWS that also need managed operations after migration
10
Vention
Software development and technology consulting company
New York, NY, US
2002
Startups, scale-ups, healthcare, fintech, SaaS, cross-industry
Product companies migrating infrastructure while continuing software development
The best cloud migration companies are not interchangeable: some are designed for global transformation programs, some specialize in a particular cloud, and others combine migration with software engineering. The profiles below focus on where each provider’s current capabilities fit most naturally.
NIX United is a software engineering and cloud services provider that supports the full migration lifecycle, from cloud migration strategy and readiness assessment through migration, application modernization, and ongoing cloud support. Its cloud practice covers AWS, Microsoft Azure, Google Cloud, IBM Cloud, and other platforms, supporting on-premises-to-cloud, cloud-to-cloud, and hybrid migration scenarios. NIX United combines 18+ years of cloud experience with 170+ cloud certifications and provides end-to-end migration services, including cloud consulting services, rather than treating infrastructure migration as a standalone project.
A key differentiator is the combination of cloud migration and software engineering. This means NIX United can address not only where workloads should run, but also whether applications, integrations, databases, and surrounding systems should be modernized as part of the migration. For businesses with legacy systems or applications that need to evolve during the move, this can reduce the need to coordinate separate migration and development vendors and create a more consistent migration process from infrastructure through application layers.
The team also addresses specialized migration scenarios beyond traditional AWS migration services. One example is NIX Bridge, an AI-powered observability migration solution developed in collaboration with AWS to help organizations move from platforms such as Datadog, Splunk, Sumo Logic, or Dynatrace to Amazon CloudWatch. The service automates the migration of monitoring assets such as dashboards, metrics, logs, and alerts, with expert validation and parallel operation designed to reduce operational disruption. The team reports that NIX Bridge can accelerate migrations from months to weeks and deliver proven observability cost reductions of up to 40%. This is particularly relevant where observability migration risks include data loss, broken alert logic, visibility gaps, duplicated platform costs, and lengthy manual configuration. NIX’s experience extends to large-scale Amazon CloudWatch observability transformations.
Best for: Mid-market and enterprise organizations that need cloud migration services combined with application modernization, software engineering, observability migration, and ongoing cloud support from one partner.
Accenture approaches cloud migration as part of broader enterprise infrastructure modernization and transformation. Its current cloud offering covers migration, infrastructure modernization, cloud operations, application management, security, and ongoing optimization across public, private, and hybrid environments.
The company works across AWS, Microsoft Azure and Google Cloud and also maintains relationships across a broader ecosystem of cloud and infrastructure technology providers. Its infrastructure modernization practice includes migration planning, cloud network transformation, managed infrastructure, and optimization.
Accenture is particularly relevant when migration involves multiple organizational units, complex governance, large infrastructure estates, or a wider digital transformation program rather than an isolated workload. Its own cloud materials emphasize combining migration with security, operational management, and optimization.
Best for: large enterprises running multi-year cloud transformation programs across multiple business units.
IBM provides cloud migration services through IBM Consulting while also operating its own public cloud platform, IBM Cloud. This makes IBM different from a migration services company that only helps clients move to third-party cloud platforms: organizations can use IBM’s consulting and migration capabilities to move workloads to AWS, Microsoft Azure, Google Cloud, Oracle Cloud, or IBM Cloud itself. IBM Cloud supports public, hybrid, and multicloud environments and is positioned by IBM as its own cloud platform for enterprise workloads.
IBM Consulting covers application and data migration, data-center modernization, hybrid cloud strategy, application modernization, and managed cloud operations. Its current offering also uses IBM Consulting Advantage for Cloud Transformation to support assessment, planning, migration, and modernization across hybrid environments.
The combination of IBM Cloud, IBM Consulting, and partnerships with AWS, Microsoft, Google Cloud, Oracle, and Red Hat gives IBM a broad position in complex enterprise and multicloud programs. Its scale and breadth can be particularly relevant for organizations dealing with large legacy estates, regulated environments, or multiple cloud platforms.
Best for: Large enterprises with complex hybrid or multicloud environments that need both cloud migration services and access to IBM Cloud, alongside consulting, modernization, and managed operations.
Cognizant combines cloud migration with application modernization, data modernization, cloud-native development, and ongoing operations. Its current Google Cloud practice, for example, covers migration from AWS and Azure to Google Cloud, data-center exits, hybrid and multi-cloud operations, application modernization, and data warehouse migration.
The company’s cloud capabilities extend across AWS, Azure and Google Cloud. Its migration work can involve infrastructure modernization, application changes, data migration, landing-zone design, and managed cloud operations.
Cognizant also demonstrates migration experience with complex enterprise workloads. One published case involved assessing options across AWS, Azure and Google Cloud for a large SAP environment and designing a migration with minimal downtime.
Best for: enterprises combining application modernization with large-scale migration and ongoing managed delivery.
Capgemini positions cloud as part of broader enterprise transformation, combining migration with application modernization, data modernization, cloud operations, and FinOps. Its current portfolio covers AWS, Microsoft and Google Cloud, including application modernization, data-center transformation, and cloud cost optimization.
Its cloud work is particularly relevant to organizations that need governance and regulatory controls embedded into the migration lifecycle. Capgemini’s security-led migration approach covers assessment, migration strategy, security controls, identity and access protection, and workload security across AWS, Azure and Google Cloud.
The company also operates cloud environments for government and regulated organizations, with documented capabilities around access management, infrastructure-as-code, backup, disaster recovery, CI/CD, and compliance-controlled cloud environments.
Best for: large regulated enterprises where governance, security, data sovereignty, and operational controls are central to the migration.
Slalom is a business and technology consulting company that combines cloud migration with organizational change, modernization, data, AI, and business transformation. Its AWS practice covers migration and modernization, legacy systems, mainframe modernization, cloud operations, DevOps, security, and industry-specific solutions.
Slalom also has validated Google Cloud migration expertise. Its Google Cloud Migration Specialization was awarded following technical assessment of its migration capabilities, and the company has documented migrations involving hundreds of virtual machines, large databases, physical servers, and hundreds of terabytes of data.
Its approach is therefore broader than moving infrastructure: the company emphasizes aligning technology programs with business outcomes and organizational adoption.
Best for: enterprises where cloud migration is part of a broader business transformation and stakeholder-alignment program.
Andersen provides cloud migration consulting alongside software development, modernization, DevOps, and broader IT services. Its current cloud migration offering lists a wide range of supported environments, including AWS, Azure, Google Cloud, Oracle, IBM Cloud, Alibaba Cloud, SAP, VMware, DigitalOcean and others.
The company positions its migration work around selecting a suitable cloud environment based on workload requirements, security, scalability, and infrastructure costs. This gives buyers flexibility when the target architecture does not fit neatly into one hyperscaler.
Its broader software engineering capability can also be relevant when migration involves application changes rather than infrastructure relocation alone.
Best for: mid-market businesses moving standard workloads while requiring additional engineering and modernization support.
Simform combines cloud engineering, application modernization, migration, DevOps, and product development. Its current migration practice covers application, infrastructure, database, data and analytics migration, as well as cloud-to-cloud and environment consolidation.
The company has particular relevance for SaaS and product organizations because its cloud work can extend into application architecture, containers, CI/CD, serverless services, observability, and modernization. Its Azure practice, for example, explicitly covers application and database migration and modernization alongside infrastructure migration.
Simform also emphasizes cost optimization and cloud governance, including rightsizing, resource cleanup, and consumption controls across cloud environments.
Best for: SaaS and product companies that need migration, modernization, and product engineering from the same provider.
Mission is CDW’s dedicated AWS practice, rather than a standalone independent cloud provider. CDW acquired Mission Cloud, and today Mission operates within CDW’s broader technology services portfolio as an AWS-focused practice. It is an AWS Premier Tier Services Partner and provides AWS assessments, migration, modernization, security, AI, and managed services.
Mission focuses specifically on AWS rather than positioning itself as a multicloud migration provider. Its services cover migration roadmapping, workload migration, modernization, cost optimization, security, and ongoing managed AWS operations. CDW also highlights Mission’s 24/7 managed cloud capabilities for organizations that want operational support after migration.
This AWS specialization can be useful for organizations that have already selected AWS and want one partner to support the migration as well as the ongoing operation and optimization of the resulting environment.
Best for: Organizations committed to AWS that need migration, modernization, cost optimization, and managed AWS operations through CDW’s dedicated AWS practice.
Vention approaches cloud migration from a product engineering perspective, combining migration consulting with application development, modernization, DevOps, and ongoing product delivery. Its current migration practice covers AWS, Azure and Google Cloud and includes readiness assessment, architecture design, strategy planning, implementation, and post-migration support.
The company’s migration approach includes rehosting, replatforming, refactoring and cloud-to-cloud migration. It also supports infrastructure-as-code, Kubernetes, CI/CD, database modernization, and cloud-native SaaS architecture.
That combination is particularly relevant for product companies that cannot stop feature development while migrating their underlying infrastructure.
Best for: startups, scale-ups, and SaaS companies that need to migrate infrastructure while continuing active product development.
Several providers in this list have significant US operations, but their delivery models differ considerably. NIX United, Accenture, IBM Consulting, Cognizant, Slalom, Simform, Mission, and Vention all have substantial US presence or headquarters, while Andersen and Capgemini are headquartered outside the US.
For buyers specifically looking for cloud migration companies in the US, the more important distinction is often delivery coverage rather than headquarters alone. A US-headquartered provider may still use global engineering teams, while a European-headquartered company may maintain US delivery capabilities.
For example, NIX United is headquartered in Tampa, Florida, while maintaining an international engineering organization. Mission operates as CDW’s dedicated AWS practice in the US, while Slalom combines US-based consulting with global cloud capabilities. Vention is headquartered in New York and also operates globally.
For US buyers, it is therefore worth confirming:
Cloud migration consulting companies typically focus on assessment, strategy, architecture, business cases, and migration planning, while full-service providers can also execute the migration and take responsibility for the resulting environment.
The distinction matters because a migration strategy is only one stage of the migration lifecycle. A consulting engagement may determine which workloads should move, recommend AWS, Azure, or Google Cloud, design the target architecture, and produce a roadmap. The organization then needs engineering capacity to execute that plan, test applications, migrate data, manage cutover, and stabilize production.
Some providers combine both models. NIX United, Accenture and Capgemini, for example, cover strategy and planning as well as implementation and ongoing cloud services. NIX’s current offering starts with a cloud readiness assessment and migration roadmap development, and extends through execution, optimization, and post-migration support.
Others have a more defined specialization. The mission is centered on AWS, with migration followed by managed AWS operations, while providers combine consulting and execution with broader software engineering capabilities.
Choosing a migration partner should start with the risks and responsibilities of the migration project, not simply the provider’s cloud certifications or company size.
Ask for a migration assessment before agreeing to execution: A credible provider should examine your existing infrastructure, applications, data, dependencies, compliance requirements, and business priorities before proposing a migration path. The assessment should produce more than a generic cloud roadmap.
Confirm the partner status for your target cloud: If AWS, Azure, or Google Cloud is central to the project, verify the provider’s current partnership and certification status. Partner status does not guarantee delivery quality, but it can confirm access to platform expertise, migration programs, funding mechanisms, and specialized technical resources.
Ask who owns downtime and cutover risk: Migration plans should define maintenance windows, replication and synchronization, testing, rollback procedures, and responsibility during cutover. Be cautious of providers promising “zero downtime” without explaining the technical conditions and limitations behind that claim.
Request the migration strategy in writing: The strategy should explain why particular workloads are being rehosted, replatformed, refactored, retained, replaced, or retired. It should also identify dependencies, sequencing, testing requirements, and business-critical workloads.
Confirm what happens to the applications after migration: Moving infrastructure without addressing an application’s architecture can simply transfer existing technical debt into a more expensive environment. Ask whether the provider can modernize applications, redesign cloud architecture, and eliminate obsolete infrastructure where appropriate.
Ask what post-migration support includes: Clarify whether support covers monitoring, incident response, security, infrastructure management, performance optimization, cost optimization, and ongoing development—or whether the engagement ends immediately after migration.
Check relevant industry experience: Healthcare, fintech, insurance, government, and other regulated sectors may have specific requirements for data management, identity and access management, auditability, disaster recovery, and data residency. Ask for examples involving comparable compliance and workload requirements.
Ask how cloud costs will be managed: Migration can reduce infrastructure costs, but poorly designed cloud environments can also create unexpected operational expenses. Ask whether the provider includes rightsizing, FinOps, architecture optimization, reserved-capacity planning, and ongoing cost monitoring.
Confirm the engineering team, not just the sales team: Ask who will design the architecture, perform the migration, handle application changes, and manage production cutover. The technical capabilities of the actual delivery team matter more than the size of the provider’s overall organization.
Request a rollback and business continuity plan: A serious migration strategy should explain what happens if a workload fails validation or production behavior differs from testing. Backup, replication, recovery objectives, rollback procedures, and business continuity should be defined before the migration begins.
Red flags include a blanket “zero-downtime” promise without conditions, pricing that covers only workload transfer while excluding modernization, no assessment phase, no documented rollback plan, or no clear ownership of post-migration operations.
The right migration partner depends on more than cloud platform coverage. Businesses should evaluate the provider’s engineering depth, migration methodology, industry experience, security capabilities, modernization scope, cost optimization approach, and ability to support the environment after go-live.
NIX United combines 18+ years of cloud experience, 500+ cloud experts, 170+ cloud certifications, and 370+ cloud projects with software engineering and ongoing cloud support. Its end-to-end approach covers assessment, strategy, migration, modernization, cloud cost optimization, and post-migration operations across major cloud platforms.
For organizations planning a complex migration, exploring our cloud migration services can be the next step toward defining the right migration strategy and execution plan.
01/
A cloud migration company is a technology provider that helps businesses move applications, data, infrastructure, and workloads from on-premises environments or one cloud platform to another. Its services can cover readiness assessment, cloud migration strategy, architecture, application migration, data transfer, testing, cutover, security, and ongoing cloud migration support. Experienced cloud migration specialists also help protect data integrity, address dependencies, and develop risk mitigation strategies. A comprehensive cloud migration approach connects technical decisions with business strategy, helping organizations improve operational efficiency, control operational costs, and achieve measurable business value.
02/
The list includes providers with significant US operations, including NIX United, Accenture, IBM Consulting, Cognizant, Slalom, Simform, Mission, and Vention. Their capabilities differ: some focus on large-scale enterprise transformation, while others specialize in AWS, broader multicloud environments, or combining migration with software engineering and managed services. The right provider depends on the organization’s cloud adoption goals, existing infrastructure, budget constraints, and need for ongoing support. For complex programs, cloud migration experts can also provide the specialized knowledge needed to manage application dependencies, security, and multi-cloud management.
03/
A cloud migration consultant typically focuses on assessment, cloud migration strategy, architecture, planning, and technology recommendations, while a full-service provider can also execute infrastructure, data, and application migration and provide post-migration management services. Some firms offer both models, so buyers should confirm exactly which parts of the migration lifecycle are included. A full-service engagement can be useful when the goal is not simply to move workloads but to enhance operational efficiency, modernize applications, eliminate technical debt, and build scalable solutions that support long-term business success.
04/
The cost varies substantially depending on the number of workloads, data volume, application complexity, target cloud, modernization requirements, compliance, and post-migration support. Organizations should also consider operational costs, licensing, data-transfer charges, and the resources required to maintain the new environment. A proper estimate normally follows an assessment rather than being based only on the number of servers or applications being moved. The right migration strategy can improve cost efficiency and create long-term cost savings, but the approach should match business priorities and budget constraints rather than focusing on the lowest initial price.
05/
A migration can take weeks for a contained workload or several months for a larger application estate, depending on dependencies, data volume, architecture, testing, compliance, and cutover requirements. Mission-critical systems generally require more planning, testing, and phased execution than straightforward infrastructure moves. A smooth migration also depends on the provider’s technical expertise, migration tools, and ability to maintain data integrity and business continuity. For example, organizations planning how to migrate to AWS may use a phased approach that starts with less critical workloads before moving more complex applications, as in this AWS e-commerce migration case study.
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NIX United, Accenture, IBM Consulting, Cognizant, Capgemini, Slalom, and Vention currently demonstrate capabilities across AWS, Azure, and Google Cloud. NIX, for example, supports migrations involving AWS, Azure, and Google Cloud Platform, as well as other cloud environments, including cloud-to-cloud and hybrid scenarios. Other providers have narrower specialization: Mission focuses on AWS, while some providers emphasize particular cloud ecosystems or enterprise environments. The choice should reflect the target platform, migration complexity, required specialized knowledge, and the provider’s ability to support the environment after a successful migration.
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