Cloud Migration Companies Compared: 11 Providers for 2026
This list gathers leading cloud migration service providers ranging from a two-person boutique AWS specialist to a 20,000-engineer global consultancy, each reviewed for platform certifications, delivery history, and what actually happens after go-live, past whatever the pitch deck promised.
Reliqsy
In legacy systems too risky to rewrite blind, Reliqsy runs cloud migration through a multi-agent AI swarm — an Archaeologist Agent scans for deprecated libraries and security gaps first. A cutover module tracks live latency and error rate; cross a 400ms or 1% threshold and a circuit breaker reverts traffic to the legacy system automatically. New code is measured against a captured baseline of the old system's behavior before anything ships. The business case: less dependence on the one or two engineers who understand the system, plus a dashboard tracking debt reduction in real time. Experts approve the roadmap and merge every pull request.
Corsac Technologies
In legacy systems too risky to rewrite blind, Reliqsy runs cloud migration through a multi-agent AI swarm — an Archaeologist Agent scans for deprecated libraries and security gaps first. A cutover module tracks live latency and error rate; cross a 400ms or 1% threshold and a circuit breaker reverts traffic to the legacy system automatically. New code is measured against a captured baseline of the old system's behavior before anything ships. The business case: less dependence on the one or two engineers who understand the system, plus a dashboard tracking debt reduction in real time. Experts approve the roadmap and merge every pull request.
Eleks
NSI's e-commerce platform saw a 5x jump in capacity after ELEKS moved it to AWS; a separate project for mining group Imerys, consolidating 60-plus websites, drove an 18% lift in monthly leads. ELEKS' engineers hold professional-level certifications across AWS, Azure, and Google Cloud individually, beyond the company's own partner-tier badges. With 120+ active client accounts and SOC 2 compliance, the firm treats migration as one piece of a longer modernization relationship.
Edvantis
The company holds ISO 27001 and ISO 9001 certification and runs its migration practice on ITIL service-management discipline and Agile delivery cycles. NSI's e-commerce platform saw a 5x jump in capacity after ELEKS moved it to AWS; a separate project for mining group Imerys, consolidating 60-plus websites, drove an 18% lift in monthly leads. ELEKS' engineers hold professional-level certifications across AWS, Azure, and Google Cloud individually, beyond the company's own partner-tier badges. With 120+ active client accounts and SOC 2 compliance, the firm treats migration as one piece of a longer modernization relationship.
SoftwareOne
As a cloud migration firm, SoftwareOne (formerly Crayon) works a Seven Rs Roadmap (rehost, replatform, refactor, relicense, retire, or retain) decided workload by workload, not a default lift-and-shift. Its PyraCloud platform tracks post-migration spend continuously rather than quarterly. A three-year, 600-server migration for a Brazilian financial cooperative cut total cost of ownership by 35%. The team will recommend retaining workloads on-premises when cloud isn't the better option.
Transparity
Transparity migrates almost exclusively onto Microsoft Azure, and its credentials reflect that narrowness: Azure Expert MSP status now in its third audit cycle, six Microsoft Solutions Partner designations, and recognition as the UK's first Microsoft Frontier Partner, a distinction Microsoft has not given widely. The company has completed more than 100 Azure cloud migrations, managing environments spanning thousands of virtual machines for clients including the NHS and Lush.
Accenture
Accenture's cloud migration practice runs on scale most boutique providers can't match: more than 20,000 AWS-certified professionals holding roughly 30,000 AWS credentials between them. AWS named Accenture its 2025 Global Migration Consulting Partner of the Year, recognition tied to customer migration outcomes specifically. Vodafone's shift to a cloud-based, digital-first model and BBVA's 117% new-customer growth over five years both ran through Accenture-led cloud programs.
Trigent
Trigent's cloud migration consulting spans eight industry verticals, including two rarely covered elsewhere: legal tech and insurance. One engagement moved a legal-preparedness platform onto AWS to improve document accuracy and turnaround for case teams — a regulated, document-heavy workload that punishes a careless migration. Trigent applies the standard rehost, replatform, refactor, or retain decision per workload, consulting across the US and India since 1995.
Euristiq
Ryanair's shift off Adobe Experience Manager onto AWS is one entry in Euristiq's client list, alongside Norton, Philips, and Beeline. The company holds AWS Advanced Tier Services Partner status, qualifying clients for Migration Acceleration Program funding that offsets upfront cost. Euristiq reports an average 33% reduction in monthly infrastructure spend after migration, achieved mostly through right-sizing. ISO 27001:2022 covers finance, telecom, energy, and healthcare clients.
Rambunct
Rambunct runs cloud migration work with a team small enough to list on two hands, yet holds nine AWS certifications spanning solutions architecture, DevOps, security, and machine learning. Its BlitzBuild service packages modernization for SMBs that can't absorb a multi-quarter engagement, and the practice has logged more than 200 launches across the US and UK. Generative AI sits beside the core migration work, reflecting a shop founded in 2021, after AWS's GenAI tooling already existed.
Andersen
A Canadian finance client's Andersen migration went beyond a platform move: the database engine changed too, from Oracle to PostgreSQL, with query optimization built into the cutover. Engine swaps carry more schema risk than same-engine lift-and-shifts, which most providers on this list skip. A separate UK project moved a 150 TB document repository and 3 TB database serving 130,000 daily users onto AWS without downtime, one of 95 migrations this cloud migration service provider has run.
Challenges
How to Evaluate Cloud Migration Service Providers Before Signing
FAQ
Can AI-generated code actually speed up a cloud migration?
Partially. AI handles discovery-phase analysis and boilerplate conversion well, common early steps for top cloud migration service providers. Core business logic still needs heavy review; roughly half of AI-generated code ends up rewritten, since unreviewed code accumulates debt like manual code.
How do I know if it's time to migrate rather than continue maintaining what I have?
Age alone is a weak signal. The stronger indicator is cost ratio: when maintenance consumes roughly 30–40% or more of what new-feature development would cost, that's typically the modernization trigger. Most systems reach this point around 8 to 12 years after their last major overhaul.
What's the difference between rehosting, replatforming, and refactoring?
Rehosting ("lift-and-shift") moves an application to the cloud with minimal changes — fastest and cheapest. Replatforming makes limited cloud-native adjustments without a full rebuild. Refactoring rearchitects the application around cloud-native features, removing more technical debt at higher cost.
In-house team, hired developers, or cloud migration services providers: which one actually works?
In-house teams know the platform's history but default to familiar approaches instead of a real rewrite. Hired developers usually lose to maintenance priorities, so modernization keeps sliding to "next." Most organizations reach cloud migration providers only after both attempts fail.
How do I know if my system is actually ready for cloud migration?
Readiness shows up in three places: how well the system performs its function, how costly it is to maintain, and how exposed it is to security. Even cloud migration services UK teams handling GDPR-bound data check deployment frequency early; quarterly releases usually signal fragile architecture.