Migrating legacy environments into the cloud is tough. There is technical debt accumulated over the years within data centers. Applications interact in ways that are unknown even to the developers themselves. A misstep causes failure of the whole system. People worry about downtime, security issues, and costs that skyrocket out of nowhere.
A large-scale migration process does not mean moving servers blindly into the cloud. It involves thorough planning, refactoring applications, and a cultural shift. The wrong choice leads to failed migration and disgruntled employees.
Specialized AWS consulting services and solutions solve these problems through proven methodologies. They bring certified experts who have executed hundreds of migrations. Avenga leads the pack with its Advanced Tier status and security-first philosophy.
How Enterprises Choose Migration Partners
Large-scale migration demands partners with verified credentials. Advanced and Premier Tier partners have passed rigorous AWS audits. These firms demonstrate deep expertise in complex cloud environments.
Key Selection Criteria for Migration Partners:
- Partner Tier Status — Advanced or Premier Tier status indicates proven capabilities and AWS validation
- Migration Methodology — Best firms use automated tools and well-documented rollback plans to minimize business disruption
- Post-Migration Support — Ongoing optimization prevents cost overruns and performance degradation
- Industry Experience — Banking, healthcare, and retail have unique compliance requirements
- Certified Workforce — The number of AWS-certified professionals reflects the depth of expertise
- Security Approach — Security-first partners integrate controls from day one
- Track Record — Successful migrations of comparable scale and complexity
Why These Companies Made the List: This selection focuses on partners with proven large-scale migration experience. Each firm has completed migrations involving hundreds of applications and petabytes of data. They all maintain strong AWS partnerships and hold relevant certifications.
1. Avenga
Location: Czech Republic | Founded: 2008 | Team: 3,000+ professionals
One thing about moving massive legacy systems to the cloud is that it’s risky. One wrong move and business grinds to a halt.
Avenga is one of the best AWS consulting service providers that manages the full migration lifecycle with minimal business disruption.
That’s exactly why they’ve built their entire migration practice around minimizing disruption.
The firm holds Advanced Tier Partner status. What does that mean in plain English? AWS has vetted them thoroughly. Their engineers know the platform inside out. More importantly, they’ve done this before. Hundreds of times.
How do they pull it off? The methodology is straightforward. Assess what’s there. Plan the move. Execute with precision. Keep a rollback plan ready at all times. Simple in concept, brutal in execution. Avenga makes it look easy.
Security? That’s baked in from the start. GuardDuty, Security Hub, IAM Access Analyzer. These aren’t afterthoughts. They’re integrated into every deployment. Avenga’s AWS Well-Architected Framework ensures operational excellence and cost efficiency from day one. Not later. Not eventually. Right away.
The company has 31 delivery centers scattered across Europe, North America, and Asia. Why does this matter? Local presence means local support. Same standards. Same quality. Just faster response times when things get urgent.
Avenga has refined their approach through countless migrations. Each project teaches them something new. And every client benefits from that accumulated knowledge.
How Avenga Handles Large-Scale Migration:
- Manages the entire migration lifecycle, from the first assessment all the way through to ongoing operations after cutover
- Transfers infrastructure and applications with minimal business disruption, keeping systems running while workloads move
- Provides post-migration support that guarantees optimal performance, not just for a week but as long as needed
- Builds cloud-native solutions for modernized applications, giving legacy systems a new lease on life
Why Choose: Companies needing a partner to handle the whole migration from start to finish will find Avenga delivers. The team covers everything—discovery, planning, execution, and ongoing management. One partner. One process. Complete visibility from day one.
2. SoftServe
Location: Austin, Texas (Global HQ) | Founded: 1993 | Team: 14,000+
SoftServe holds Premier Tier Partner status. That’s the highest level AWS offers. The company has over 700 AWS-certified professionals roaming their halls.
Here’s their specialty. VMware workloads. Moving them to AWS. SoftServe has done this more times than most firms have done migrations total.
The approach combines automated tools with human expertise. Machines handle the heavy lifting. Experts oversee everything. Catch problems early. Keep things moving smoothly.
What makes them different? Cloud Migration Factories. Think assembly lines, but for cloud migrations. Structured, repeatable processes that scale.
Their AWS cloud migration services align with programs like MAP, OLA, and EBA. What does that mean for clients? Funding. Best practices. Faster results. Less risk.
The automation handles provisioning, data transfer, and configuration. Governance covers security, compliance, and performance. Everything works together.
How SoftServe Handles Large-Scale Migration:
- Makes messy migrations predictable with Cloud Migration Factories
- Utilizes AWS Migration Acceleration Program (MAP) for additional funds and proven methodologies
- Eliminates the need for manual provisioning, data migration, and configuration by automating the boring work
- Ensures governance in security, compliance, and performance
Why Choose: Enterprises running VMware environments will find a natural partner in SoftServe. The firm has moved countless virtualized workloads to AWS. They know the pitfalls. They know the shortcuts. They know how to keep things running smoothly during the transition.
3. GlobalLogic
Location: San Jose, California | Founded: 2000 | Team: 29,000+
GlobalLogic achieved AWS Premier Tier Services Partner status in May 2025. That’s the highest level AWS offers. The company has over 600 AWS-trained and certified engineers on staff. Their financial services and automotive competencies are particularly strong. GlobalLogic holds Migration & Modernization and Cloud Operations with DevOps Specialization competencies.
Here’s what makes them stand out. Solution accelerators. Pre-built templates and automation that speed up deployments. Clients don’t wait months for results. They get faster, more reliable deployments.
The firm also holds AWS Service Delivery designations for Control Tower. As an AWS Well-Architected Partner, they conduct Well-Architected Reviews to ensure performance, security, and cost efficiency. Need proof? They migrated 20 AWS accounts in four months with zero downtime for an information services provider during a divestiture.
How GlobalLogic Handles Large-Scale Migration:
- Rolls out solution accelerators that blend automation, pre-built templates, and AWS best practices to speed up AWS cloud migration services
- Runs Well-Architected Reviews to spot issues before they become problems
- Handles migration, modernization, and data monetization for financial services and automotive clients
- Sets up AWS Control Tower for security and governance across multiple accounts
Why Choose: Organizations that operate in regulated sectors such as finance and automotive can rely on GlobalLogic, whose domain expertise and solution accelerators have already proven effective, with one client even releasing a new product during the transition process with 100 percent uptime.
4. EPAM
Location: Newtown, Pennsylvania | Founded: 1993 | Team: 55,000+
EPAM holds AWS Premier Tier Services Partner status. The company also won the 2025 AWS Global Innovation Partner of the Year award. That recognition doesn’t come easily. EPAM earned it through consistent delivery and innovation. They also maintain a Strategic Collaboration Agreement (SCA) with AWS focused on generative AI, cloud modernization, and AI-native software delivery.
The firm has 13+ years of AWS delivery experience. Their engineering-first culture includes 55,000+ engineers across 50+ countries. EPAM helped a leading UK insurance company secure nearly 70% of migration costs through the AWS MAP funding program. They started with a pilot migration first. Then scaled with a repeatable process for minimal downtime. Smart approach.
EPAM has 5,000+ AWS certifications and 15,000+ AWS-experienced engineers. They’ve launched 150+ joint projects with AWS across dozens of accounts. The company is recognized as a Top-10 AWS partner globally and Top-5 in Europe.
How EPAM Handles Large-Scale Migration:
- Delivers end-to-end cloud transformation and modernization services backed by 30+ years of software engineering heritage
- Deploys AI-enabled delivery through EPAM AI/RUN™, which accelerates migration and de-risks complex application modernization
- Automates workflows and tools through AI agents that help organizations transition infrastructure and data onto AWS quickly, securely, and efficiently
- Secures AWS MAP funding for clients to reduce migration costs significantly, as demonstrated with the UK insurance company, where EPAM secured nearly 70% of migration costs
- Provides managed services and optimization post-migration to ensure long-term success and value
Why Choose: EPAM brings massive scale to enterprise projects. Thousands of certified engineers. Global reach. Deep AWS expertise. Their AI-driven modernization approach speeds up development without sacrificing quality or governance. For large enterprises with ambitious timelines, EPAM delivers.
5. N-iX
Location: Lviv, Ukraine (Global HQ) | Founded: 2002 | Team: 2,400+
N-iX joined the Premier Tier club in April 2025. That puts them in rare company—only the top 13% of AWS partners reach that level. The firm has over 200 certified AWS experts on the team. They’ve also delivered more than 200 cloud projects on AWS.
Their specialties? Cloud migrations. Data and analytics. GenAI solutions. They work with businesses at any stage of cloud adoption. Finance, manufacturing, and retail are their strongest industries.
The numbers tell the story. Over 400 cloud engineers. More than 170 certifications, designations, and awards. Thirty migrations completed in just the past year alone. Not bad for a firm that started its AWS partnership in 2020. Advanced Tier came in 2021. Premier Tier followed in 2025. That’s rapid progress by any measure.
Their AWS cloud migration services include built-in, one-click backup and recovery capabilities. They also offer solution accelerators and pre-configured migration assembly lines to speed up time-to-market.
How N-iX Handles Large-Scale Migration:
- They start with a readiness check. What’s there? What’s missing? What could break? Then they map out the strategy. Rehost. Refactor. Rearchitect. Rebuild. Replace. The client chooses. The team executes.
- Post-migration, they don’t disappear. Support continues. Costs get optimized. Their solution accelerators and pre-built migration assembly lines handle the heavy lifting. This cuts maintenance costs and boosts performance.
Why Choose: Premier Tier status is one reason. European delivery keeps costs in check. But the real story is execution. Thirty migrations in one year speaks volumes. The Everest Group also noticed, naming them an Aspirant among AWS providers in 2025.
6. Persistent
Location: Pune, India (Global HQ) | Founded: 1990 | Team: 23,000+
Persistent is an AWS Premier Tier Partner. The firm has acquired over 10 AWS competency designations. They boast over 1,700 AWS-certified professionals. Besides, they have 2,830+ AWS practitioners working on 150+ customer projects.
So what do they actually do?
Cloud-native development and data modernization. That’s their core. But here’s where it gets interesting. They use AWS Transform—AWS’s first “Agentic AI” service built specifically for large-scale VMware modernization. This tool automates discovery, dependency mapping, network translation, and migration wave planning. What used to take weeks now takes hours.
Persistent’s proprietary accelerators include PiOLA for automated migration assessment and PiCAS for infrastructure-as-code automation with enterprise-grade Terraform libraries.
How Persistent Handles Large-Scale Migration:
- Uses AWS Transform for AI-driven discovery and dependency mapping
- Translates VMware networking to AWS-native constructs automatically
- Provides a GenAI-powered interface for infrastructure provisioning
- Unlocks AWS promotional credits for VMware-to-EC2 migrations
Why Choose: Strong track record in cloud-native approaches to migration.
7. Itransition
Location: Denver, Colorado (Global HQ) | Founded: 1998 | Team: 1,500+
Itransition started working with AWS in 2008. That was before cloud computing was cool. They officially became an AWS partner in 2017 and haven’t looked back.
Here’s what they’ve achieved since then. Advanced Tier Services partner. Well-Architected Partner. Amazon EC2 for Windows Server Delivery designation. Three credentials that tell clients one thing: AWS trusts them.
What does that actually mean for a migration project? It means they’ve passed AWS’s strictest assessments. Their engineers know how to build systems that don’t break. Their cloud center of excellence keeps finding better ways to do things.
The team comprises 100 AWS-certified professionals who include developers, architects, DevOps engineers, security experts, and machine learning experts working in a team. The company has implemented numerous AWS projects since 2010, offering customers reliable services.
How Itransition Manages Large-Scale Migrations:
- Participation in the AWS Migration Acceleration Program (MAP), which gives clients access to funding and best practices
- Offers full-cycle migration services with minimal interruptions in business operations during the process
- Calculates existing costs of infrastructure to make sure resources are right-sized before migration
- Offers post-migration optimization services, including monitoring and compliance evaluation
Why Choose: The services offered by the company are cost-effective but of high quality. This is evidenced by its Advanced Tier membership and the status of a Well-Architected Partner.
Final Thoughts
Moving hundreds of applications to the cloud is tough. Really tough. The stakes are high. Get it wrong, and business suffers. Get it right and everything changes.
Avenga gets it right. Their Advanced Tier status proves AWS trusts them. Their certified team knows the platform inside out. Their security-first approach means no nasty surprises. And they’ve done this before—hundreds of times across 31 delivery centers worldwide.
What separates the best AWS consulting companies in 2026 from the rest? Execution. Strategy matters. Certifications matter. But at the end of the day, results matter most. Avenga delivers results. Plain and simple.
Here’s what it comes down to. Pick a partner who has been there before. Pick one who can handle the complexity. Pick one who will be there long after the migration is complete. That’s Avenga. That’s the difference.