Enterprises rarely struggle with whether to move to the cloud. The harder problem is choosing who moves them — and getting that decision wrong is expensive. A migration run by the wrong partner shows up months later as runaway cloud bills, stalled modernization, or a production system that performs worse than the data center it replaced.
The market does not make the choice easier. Hundreds of firms describe themselves as cloud migration service providers or multi-cloud migration companies, from global consultancies to boutique hyperscaler specialists, and most of the real differentiation sits below the surface: in delivery model, regional depth, and what happens after go-live. The right top cloud migration companies are the ones whose track record matches your workloads and your regulatory environment — not the ones with the largest sales team.
This article profiles the top cloud migration companies operating across Europe, the USA, and the UK, and explains where each one fits.
Our Selection Methodology
We built this list around documented delivery. We reviewed each provider’s public case studies and technical portfolios, partner status across AWS, Microsoft Azure, and Google Cloud, independent reviews on platforms such as Clutch and Gartner Peer Insights, and verifiable regional presence.
Every company here carries a multi-year record of enterprise cloud migration and modernization work. We gave extra weight to providers that demonstrate outcomes after go-live — cost control, reliability, and operational ownership — rather than a completed lift-and-shift and a closed ticket. We grouped companies by the region where their cloud migration consulting and delivery presence is strongest. Several operate globally; we placed each one where its track record is most distinct.
Top Cloud Migration Companies in Europe
European migration decisions turn on data residency, EU regulation, and multi-cloud strategy as much as on raw engineering. The providers below combine hyperscaler depth with the compliance posture that European enterprises need.
Crunch-IS
Crunch-IS is an AI-enabled custom software engineering company delivering low-risk migrations to AWS, Azure, and Google Cloud, with daily operations protected. Its cloud practice runs on engineering depth — 8+ years of delivery and 170+ engineers and consultants across the US, UK, Canada, and the DACH region. AI-enabled delivery compresses the technical workstreams inside each migration: infrastructure-as-code generation, validation scripting, and documentation. One recent result anchors the approach: a US healthcare provider’s scheduling and billing system moved to AWS in 10 weeks, with 99.9%+ availability from day one. Explore the cloud migration services practice for scope.
Capgemini
Capgemini is a French-headquartered global leader in cloud transformation, with large-scale migration and modernization programs across regulated European industries and deep alliances with all three hyperscalers. Its Cloud Infrastructure Services arm runs enterprise migrations at scale, paired with strategy, change management, and managed operations. Capgemini’s strength is platform-led transformation across complex multi-country estates; organizations weighing bespoke engineering against full-program consulting should calibrate which model their migration actually needs.
EPAM Systems
EPAM Systems is a global digital engineering company with deep Central and Eastern European delivery centers, recognized by Forrester for its platform engineering capabilities. Its cloud work centers on application migration, cloud-native modernization, and platform engineering across AWS, Azure, and Google Cloud. EPAM’s primary focus is engineering-led modernization rather than commodity-managed hosting; teams that need ongoing run-and-operate services more than build-and-modernize should confirm the engagement model fits.
SoftServe
SoftServe is a digital and cloud engineering company founded in Ukraine, with major European delivery centers and Premier or equivalent partner status across AWS, Microsoft Azure, and Google Cloud. Its cloud migration services lean toward cloud-native modernization, data platform migration, and application re-architecture rather than straight rehosting. SoftServe suits organizations that want engineering-grade modernization alongside the migration itself; buyers seeking a pure infrastructure-managed-services contract should scope that separately.
Reply
Reply is an Italian network of specialized companies, several of which are dedicated to a single hyperscaler — Storm Reply for AWS and Cluster Reply for Microsoft, among them. That structure gives Reply a genuine platform depth across European markets, covering cloud migration, modernization, and managed cloud. The federated model is also worth watching: engagement quality depends on which Reply company leads the work, so buyers should confirm the specific team and its platform specialization.
T-Systems
T-Systems, the enterprise arm of Deutsche Telekom, is a German managed-services and migration provider that pairs multi-cloud delivery on AWS, Azure, and Google Cloud with a European sovereign-cloud offering. Its T-Systems Sovereign Cloud, powered by Google Cloud, applies EU-operated controls for data residency and sovereignty. T-Systems is the strongest fit where European data-residency or sovereignty rules are a hard requirement — public administration, finance, and regulated infrastructure — rather than for organizations chasing the lowest unit cost on public cloud.
Cloud Migration Companies in the USA
The US market runs on hyperscaler ecosystems and enterprise modernization at scale. These cloud migration consulting companies range from global advisory firms to managed-services specialists, and the right choice depends on how much you want to own after go-live.
Accenture
Accenture is the largest global consulting and technology services firm, with a cloud practice that spans strategy through migration, managed operations, and deep alliances across AWS, Azure, and Google Cloud. Few providers can match its scale on enterprise cloud migration and modernization programs. That scale is also the trade-off: Accenture excels at platform-led transformation, and organizations that need focused, bespoke migration engineering should calibrate scope against the full-program model.
IBM Consulting
IBM Consulting brings a hybrid-cloud focus built around Red Hat OpenShift and a long enterprise track record in mainframe-to-cloud and multi-cloud management. Its AWS migration services, Azure migration consulting, and Google Cloud migration services sit alongside strong governance and regulated-industry experience. IBM is a practical path for organizations already inside its ecosystem or running hybrid estates; teams evaluating build-versus-buy flexibility should weigh platform dependency early.
Cognizant
Cognizant is a large IT services firm with three decades of enterprise delivery and substantial cloud migration and modernization work for healthcare, financial services, and life sciences clients across AWS, Azure, and Google Cloud. Its strength is running multi-year transformation programs at enterprise scale. Organizations that need a smaller, engineering-led team focused on a specific workload should test how closely the standard engagement model aligns with their migration.
Slalom
Slalom is a US consulting firm and one of the most decorated hyperscaler partners in North America, with repeat AWS Partner of the Year recognition and strong Azure and Google Cloud practices. Its collaborative, locally staffed model fits cloud data migration, modernization, and analytics work for mid-market and enterprise clients. Slalom’s footprint is heavily North America–centric, so organizations needing global, follow-the-sun delivery should confirm regional coverage for their estate.
Rackspace Technology
Rackspace Technology is a multi-cloud managed services and migration specialist covering AWS, Azure, Google Cloud, and private cloud, with FinOps and managed operations built into its model. It is a strong fit for organizations that want a partner to both move the workloads and run them long term. Rackspace leads with managed services rather than deep custom engineering, so teams whose primary need is application re-architecture should scope that capability explicitly.
Kyndryl
Kyndryl, spun out of IBM as the world’s largest IT infrastructure services provider, runs enterprise cloud migration at a scale few can match — it reports migrating more than 500,000 workloads across the prior three years — with a repeatable methodology and managed services across AWS, Azure, Google Cloud, IBM Cloud, and Oracle. Its depth in legacy estates, SAP, and mission-critical systems makes it a strong pick for large, complex migrations. Smaller, cloud-native builds are not where its model is most efficient.
Cloud Migration Companies in the UK
UK migration work is shaped by the public sector, financial services, and data-residency rules, with frameworks such as G-Cloud channeling much of the demand. The firms below combine hyperscaler delivery with the UK market depth that buyers expect.
CGI
CGI is among the largest independent IT and business consulting firms globally, with a major UK presence across the public and private sectors. Its 2025 acquisition of BJSS deepened its UK digital-engineering and software bench, adding more than 2,400 specialists to a portfolio that already spanned cloud, AI, and data across AWS, Azure, and Google Cloud. CGI is consulting-led and especially strong in the UK government, financial services, and energy; the breadth is the calibration point for buyers who want a narrowly scoped technical team.
Version 1
Version 1 is a UK and Ireland enterprise transformation firm with Premier AWS status alongside strong Microsoft and Oracle practices, covering cloud migration, modernization, and managed cloud. It carries a notable Oracle and AWS heritage, which makes it a strong choice for organizations migrating those estates. Version 1 works deep across UK enterprise and public-sector clients; teams pursuing a Google Cloud–first strategy should confirm platform depth for their specific workloads.
Kainos
Kainos is a UK and Northern Ireland–listed firm with a strong public-sector and healthcare record, combining digital services with a large Workday practice and AWS-focused cloud delivery. Its experience with UK government frameworks and digital service standards makes it a credible partner for public-sector cloud migration and modernization services. Buyers needing broad multi-cloud breadth beyond AWS and Workday should scope that requirement up front.
Computacenter
Computacenter is a UK-listed technology integrator with substantial infrastructure heritage and a growing cloud migration and managed-services practice across AWS, Azure, Google Cloud, and hybrid environments. It is well-suited to large enterprises and public-sector organizations running mixed hybrid cloud migration estates that need integration and ongoing support. Computacenter leads with integration and managed services rather than deep application re-architecture, which is the line to confirm against your goals.
Claranet
Claranet is a UK and European managed-cloud and migration provider with a 25-year operating heritage, hyperscaler-agnostic delivery across AWS, Azure, and Google Cloud, and embedded FinOps and security. It builds compliance-ready landing zones for regulated sectors such as financial services and runs the environment after migration. Claranet is a strong fit where managed operations and security matter as much as the move itself; organizations seeking large-scale strategic transformation consulting may find its model more operational than advisory.
Made Tech
Made Tech is a London Stock Exchange–listed UK firm focused on public-sector digital, data, and cloud modernization services, delivering through government frameworks including G-Cloud. Its work pairs software engineering with cloud migration for central and local government and the NHS, which gives it genuine depth in UK public-sector delivery and procurement. That focus is also its boundary: commercial enterprises outside the public sector will find more relevant options elsewhere on this list.
What Sets Crunch-IS Apart as a Cloud Migration Company
Crunch-IS is an AI-enabled custom software engineering company with 8+ years of delivery and 170+ engineers and consultants serving clients across the US, UK, Canada, and the DACH region. The cloud practice spans Cloud and DevOps, data engineering, and application architecture.
AI-Enabled Delivery That Compresses Timelines
Crunch-IS embeds AI agents across technical workstreams in every migration — generating infrastructure-as-code, automating validation scripts, and accelerating documentation — so engineers can spend their time on decisions that require human judgment. The result is faster delivery without proportional headcount or added risk.
Proven Cloud Strategy and Migration Planning
The numbers tell the story before the method does. When Crunch-IS migrated a US healthcare provider’s patient scheduling and billing system to AWS, the engagement ran 10 weeks from assessment to stabilization — on time, within scope, and with 99.9%+ availability from day one. Disaster recovery time dropped from up to 8 hours to under 15 minutes, infrastructure-related support tickets fell by 50%, and the move eliminated $150K–$300K in on-premise hardware refresh costs without touching application code.
That outcome was a product of strategy: every engagement starts with an infrastructure inventory, utilization analysis, dependency mapping, and a roadmap that sequences workloads by complexity and business impact.
Cost-Optimized, Secure, Multi-Cloud Architectures
Crunch-IS designs for AWS, Azure, and Google Cloud, including hybrid cloud migration and multi-cloud environments, and knows the trade-offs between platforms well enough to steer architecture rather than default to one.
Cost observability is built in from day one and applied as an ongoing FinOps discipline. Security comes from the design phase through DevSecOps practices, and the Site Reliability Engineering practice defines and holds availability and performance targets after go-live. The strategy you choose still matters most, which is why Crunch-IS scopes each move around the migration strategy that matches your business.
Conclusion
The top cloud migration companies are not interchangeable. A global consultancy, a hyperscaler-native managed-services provider, a public-sector specialist, and an AI-enabled engineering partner solve different problems — and the cost of a mismatch lands long after the contract is signed. The decision in front of you is less “who is biggest” and more “whose delivery model, regional depth, and post-migration ownership fit my workloads.”
