Mainframe Modernization Companies
Compare mainframe modernization companies by the languages, workloads, and data layers they cover. Distinguish tools and platforms from firms that take responsibility for delivery, then check the linked evidence against your estate. Companies are listed alphabetically, without rankings or scores.
Compare mainframe modernization companies
Use the available filters to narrow the list by source stack, modernization approach, supplier type, team size, or region. Review the language, workload, data-layer, and delivery evidence before adding a company to your shortlist. We currently have no sponsors. Vendor inclusion, recommendations, and highlights are editorial decisions based on documented evidence.
The lists show recorded source and target technologies. They do not prove delivery of every combination. Follow the public evidence links to the checked claims below. “Public sources not reviewed here” means we have not checked those claims; it is not a judgment of the supplier’s performance.
| Company | Recorded source → target coverage | Approach | Type | Team size | Region | Public evidence kind | |
|---|---|---|---|---|---|---|---|
| Accenture | Mainframe (z/OS) to AWS, Azure, GCP | Replatform | Delivery firm | Enterprise | Global | Public sources not reviewed here | 1 internal relationship record |
| Advanced | COBOL to .NET | Refactor | Delivery firm | — | — | Public sources not reviewed here | 1 internal relationship record |
| Astadia | COBOL, Assembler, CA IDMS, Natural/Adabas, Unisys, Mainframe (z/OS) to AWS, Azure, Google Cloud, Oracle Cloud, Java, C#, .NET | ReplatformRefactor | Delivery firm | Mid-size | St. Louis, MO, USA (US HQ); Kontich, Belgium (Europe HQ) | Supplier-reported case study; Official capability documentation | 4 internal relationship records |
| AWS Mainframe Modernization | COBOL, PL/I to AWS | Refactor | Product or platform | Enterprise | Global | Official capability documentation | 1 internal relationship record |
| Azure Migrate | To: Azure | — | Product or platform | — | — | Public sources not reviewed here | 0 internal relationship records |
| Capgemini | RPG, IBM i (AS/400), COBOL to AWS, Azure, .NET | ReplatformRefactor | Delivery firm | Enterprise | Global (France HQ) | Public sources not reviewed here | 2 internal relationship records |
| CloudFrame | COBOL to Java, AWS, Azure, Google Cloud, IBM LinuxONE | Refactor | Delivery firm | — | Princeton, NJ, USA | Public sources not reviewed here | 1 internal relationship record |
| Cognizant | RPG, IBM i (AS/400), Mainframe (z/OS) to AWS, Azure | ReplatformRefactor | Delivery firm | Enterprise | Global (US HQ) | Public sources not reviewed here | 4 internal relationship records |
| Deloitte | RPG, IBM i (AS/400) to AWS, Azure | Replatform | Delivery firm | Enterprise | Global | Public sources not reviewed here | 2 internal relationship records |
| DXC Technology | Mainframe (z/OS) to AWS | RehostReplatformRetain & optimize | Delivery firm | Enterprise | Global | Public sources not reviewed here | 1 internal relationship record |
| Heirloom Computing | COBOL, PL/I, JCL, CICS, Assembler, Mainframe (z/OS) to AWS, Oracle Cloud, IBM Z, Java | ReplatformRefactor | Delivery firm | Boutique | Alamo, CA, USA (Dublin, Ireland office) | Supplier-reported case study | 1 internal relationship record |
| IBM Consulting | COBOL, CICS, CA Gen to IBM Z, Linux for IBM Z, Cloud or distributed platforms | Refactor | Delivery firm | Enterprise | Armonk, NY, USA (global) | Official capability documentation; Supplier-reported case study | 2 internal relationship records |
| IBM watsonx Code Assistant for Z | COBOL to IBM Z, Java | Refactor | Product or platform | — | — | Official capability documentation; Supplier-reported case study | 0 internal relationship records |
| Infosys | COBOL, RPG, IBM i (AS/400), Mainframe (z/OS) to AWS, Azure | ReplatformRefactor | Delivery firm | Enterprise | Global (India HQ) | Public sources not reviewed here | 4 internal relationship records |
| Intellias | COBOL to Java | Refactor | Delivery firm | Enterprise | Ukraine (Global) | Public sources not reviewed here | 1 internal relationship record |
| Kyndryl | RPG, IBM i (AS/400) to AWS, Azure | ReplatformRetain & optimize | Delivery firm | Enterprise | Global | Public sources not reviewed here | 1 internal relationship record |
| Micro Focus | COBOL to .NET, JVM | ReplatformRefactorRetain & optimize | Product or platform | Enterprise | Global | Public sources not reviewed here | 1 internal relationship record |
| Modern Systems | COBOL to x86 | RehostReplatformRefactor | Product or platform | Enterprise | USA | Public sources not reviewed here | 1 internal relationship record |
| Scalo | COBOL to Java | — | Delivery firm | Mid-size | Wrocław, Poland (US office in Plano, TX) | Public sources not reviewed here | 0 internal relationship records |
| SoftServe | Mainframe (z/OS) to AWS, Azure | ReplatformRefactor | Delivery firm | Enterprise | Global (Ukraine Origins) | Public sources not reviewed here | 2 internal relationship records |
| TCS | COBOL, RPG, IBM i (AS/400), Mainframe (z/OS) to AWS, Azure, Java | ReplatformRefactor | Delivery firm | Enterprise | Global (India HQ) | Public sources not reviewed here | 5 internal relationship records |
| TSRI | COBOL, Ada, Fortran, Jovial to .NET | Refactor | Delivery firm | Boutique | USA | Public sources not reviewed here | 1 internal relationship record |
The count covers this site’s migration and service links for each company, listed under its entry. It does not count verified case studies or successful projects.
The checked public sources, scoped claims and limits for suppliers across hubs are published as an open vendor evidence dataset with CSV and JSON downloads.
Before requesting bids, use the Mainframe Modernization services guide to define the work, delivery responsibilities, project cost, and timeline.
Public evidence by migration task
We checked public sources for selected suppliers and migration tasks. Each starting system and target comes from the linked source. Open an entry to see the supplier’s responsibility, source dates, and limits. Products require an implementation team. Capability documentation describes supported work; a customer delivery record describes completed work.
| Migration task | Suppliers with linked evidence |
|---|---|
| Replatform Unisys COBOL |
|
| Transform mainframe code |
|
| Replatform or refactor to AWS |
|
| Check AWS onboarding eligibility |
|
| Replatform CICS COBOL to Java on AWS |
|
| Modernize on IBM Z |
|
| Enable mainframe API integration |
|
| Assist COBOL-to-Java transformation |
|
| Understand COBOL before platform decisions |
|
What evidence should a provider show?
Use these guides to decide what to ask providers and what evidence to require before accepting their work. Internal record counts and capability labels do not establish that a provider meets your requirements.
- Separate conversion, replatforming, and performance evidence
Evaluate dependencies, representative load, and cutover recovery for the proposed approach.
- Check mainframe data mapping and reconciliation requirements
Request copybook-aware mappings and proof that data conversion preserves business results.
- Verify batch dependencies, restart behavior, and processing windows
Test scheduler behavior and failed-job recovery through a representative batch-cycle pilot.
Approach matrix
How Mainframe Modernization companies map to modernization approach
Rows group mainframe modernization companies by modernization approach, defined in our 7 Rs of application modernization framework; columns separate product vendors from delivery firms.
| Approach | Product | Delivery firm |
|---|---|---|
| Rehostsame code, new infrastructure or emulator | Product | Delivery firm |
| Replatformsame core code, swapped runtime or managed services | Product | Delivery firm |
| Refactorthe existing code is converted or restructured in place | Product | Delivery firm |
| Rewriterebuilt from scratch on a new architecture | ProductNone documented | Delivery firmNone documented |
| Replaceswapped for a commercial or SaaS product | ProductNone documented | Delivery firmNone documented |
| Retain & optimizekept in place and improved | Product | Delivery firm |
2 companies are not plotted: no documented approach evidence.
What each company delivers in mainframe modernization
One entry per company, carrying only attributes we can point at a source for. Where a company has no published evidence for an attribute, nothing is shown rather than a placeholder.
Engagement bands in this domain
- Small
- $80K–$150K
- Mid-market
- $180K–$350K
- Enterprise
- $400K–$800K
Spans are the published pricing tiers on this domain’s service pages (COBOL Migration Services), cross-checked against the cost benchmarks. A company is placed in a band by its team size — this is a statement about the size of engagement firms of that scale typically deliver here, not a rate card. We publish no per-vendor rates.
Accenture
AgencyStrategic modernization programs at execution scale, with the myNav platform used to select a migration path across all major cloud providers.
Replatform- Best for
- Strategic modernization programs
- Modernizes
- Mainframe (z/OS) to AWS, Azure, GCP
- Firm profile
- Enterprise · Global
- Typical engagement band
- Enterprise · $400K–$800K
- Internal research links
- Mainframe to Azure Migration Services
Advanced
AgencyHistorically offered COBOL rehosting and refactoring onto C#/.NET through its Modern Systems unit, with documented strength in legacy databases such as IDMS and Datacom. Advanced agreed to sell that application modernization business to IBM in January 2024, and OneAdvanced's current website lists no mainframe modernization offering.
Refactor- Best for
- Complex legacy databases (IDMS, Datacom)
- Modernizes
- COBOL to .NET
- Internal research links
- COBOL to C# Migration Services
Astadia
AgencyMainframe migration provider (part of Amdocs since 2023) with FastTrack code transformation and testing tools; its City of Miami case documents Unisys COBOL replatforming to Windows Server and the .NET Framework.
ReplatformRefactor- Modernizes
- COBOL, Assembler, CA IDMS, Natural/Adabas, Unisys, Mainframe (z/OS) to AWS, Azure, Google Cloud, Oracle Cloud, Java, C#, .NET
- Firm profile
- Mid-size · St. Louis, MO, USA (US HQ); Kontich, Belgium (Europe HQ)
- Typical engagement band
- Mid-market · $180K–$350K
Public evidence for this capability
Replatform Unisys COBOL
Unisys COBOL and DMSII mainframe dispatch system to Micro Focus COBOL on Windows Server and .NET Framework; Microsoft SQL Server 2005
Astadia reports replatforming the City of Miami dispatch system by converting Unisys COBOL to Micro Focus COBOL and moving DMSII data to SQL Server.
Supplier responsibility: Astadia implemented the modernization with Micro Focus Enterprise Developer; Micro Focus was also involved.
Evidence limit: Supplier-published historical case with no explicit publication date; it demonstrates COBOL replatforming, not conversion to C# or deployment to Azure.
Supplier-reported case study · The City of Miami
Source publication date not stated · Source checked
Transform mainframe code
Legacy COBOL, Assembler, IDMS and Natural/Adabas to Java or C# with SQL databases
Astadia describes FastTrack tools for code transformation, data conversion, testing and DevOps, with Java and C# among the documented targets.
Supplier responsibility: Delivery specialist and FastTrack tool supplier; tools are also available to partners and clients.
Evidence limit: Capability description; it provides no customer-specific functional-equivalence percentage or guaranteed automation rate.
Official capability documentation · Astadia - The Migration Factory
Source publication date not stated · Source checked
AWS Mainframe Modernization
PlatformAWS product tooling for replatforming with Rocket Software and Java refactoring with AWS Transform; the classic managed and self-managed experiences are closed to new customers.
Refactor- Modernizes
- COBOL, PL/I to AWS
- Firm profile
- Enterprise · Global
- Typical engagement band
- Enterprise · $400K–$800K
- Internal research links
- COBOL Migration Services
Public evidence for this capability
Replatform or refactor to AWS
Mainframe applications including COBOL and PL/I to AWS runtime environments; Java-based applications for automated refactoring
AWS documents replatforming with Rocket Software to preserve application language and artifacts, and refactoring with AWS Transform to produce a Java-based application stack.
Supplier responsibility: AWS product and runtime tooling; AWS recommends engaging migration competency partners or Professional Services for delivery.
Evidence limit: Capability documentation, not customer delivery evidence; both classic managed and self-managed experiences are closed to new customers.
Official capability documentation · What is AWS Mainframe Modernization?
Source publication date not stated · Source checked
Check AWS onboarding eligibility
Mainframe applications considered for AWS Mainframe Modernization to Existing AWS Mainframe Modernization experiences
AWS records new-customer closure from 7 November 2025 for the managed experience and 30 July 2026 for the self-managed experience; existing customers may continue using them.
Supplier responsibility: AWS operates the product experiences; this record concerns eligibility rather than migration delivery.
Evidence limit: Closure dates differ from announcement dates; buyers must assess current alternatives rather than assume a new account can use these experiences.
Official capability documentation · Document history for the AWS Mainframe Modernization User Guide
Source publication date not stated · Source checked
Azure Migrate
PlatformAzure Migrate supports servers, SQL Server databases and web apps; Microsoft's documentation does not list mainframe systems as a supported source, and its mainframe guidance points to separate rehosting and partner tools.
- Modernizes to
- Azure
Capgemini
AgencyIndustrial-scale modernization under an Economic Application Modernization approach that optimizes run cost while migrating, including large AS/400-resident ERPs such as JD Edwards.
ReplatformRefactor- Best for
- Large ERPs running on AS400 (JD Edwards, etc.)
- Modernizes
- RPG, IBM i (AS/400), COBOL to AWS, Azure, .NET
- Firm profile
- Enterprise · Global (France HQ)
- Typical engagement band
- Enterprise · $400K–$800K
- Internal research links
- AS/400 to Cloud Migration Services, COBOL to C# Migration Services
CloudFrame
AgencySoftware vendor whose Continuum, Atlas and CodeNavigator products analyse COBOL runtime behaviour, generate documentation and convert COBOL to Java, plus a mainframe MIPS-optimization path; an earlier Relocate product ran converted Java on zIIP processors. All of this is vendor-described.
Refactor- Best for
- Teams weighing Java output against C#; CloudFrame documents Java as its target language and does not document C# output
- Modernizes
- COBOL to Java, AWS, Azure, Google Cloud, IBM LinuxONE
- Firm profile
- Princeton, NJ, USA
- Internal research links
- COBOL to C# Migration Services
Cognizant
AgencyThe Skygrade platform applies generative AI to accelerate cloud-native transformation, with the firm's deepest mainframe delivery evidence in banking, healthcare, and life sciences.
ReplatformRefactor- Best for
- Healthcare and regulated industries
- Modernizes
- RPG, IBM i (AS/400), Mainframe (z/OS) to AWS, Azure
- Compliance & regulated delivery
- Banking, Healthcare, Life sciences
- Firm profile
- Enterprise · Global (US HQ)
- Typical engagement band
- Enterprise · $400K–$800K
Deloitte
AgencyEnterprise transformation that runs risk, controls, and compliance advisory alongside the conversion — its mainframe delivery evidence sits on IBM i (AS/400) and RPG estates moving to AWS and Azure.
Replatform- Best for
- Regulated organizations needing governance and audit rigor alongside the migration
- Modernizes
- RPG, IBM i (AS/400) to AWS, Azure
- Compliance & regulated delivery
- Regulated industries (governance and audit advisory)
- Firm profile
- Enterprise · Global
- Typical engagement band
- Enterprise · $400K–$800K
- Internal research links
- AS/400 to Cloud Migration Services, Mainframe to Azure Migration Services
DXC Technology
AgencyMainframe-as-a-Service and hybrid modernization built on CSC and HPE Enterprise Services heritage, aimed at estates that optimize on-premise while moving in stages.
RehostReplatformRetain & optimize- Best for
- Risk-averse organizations needing 'safe hands'
- Modernizes
- Mainframe (z/OS) to AWS
- Firm profile
- Enterprise · Global
- Typical engagement band
- Enterprise · $400K–$800K
- Internal research links
- AWS Mainframe Migration: Cost, Timeline & Approaches
Heirloom Computing
AgencyCompiler-based conversion of IBM mainframe COBOL, PL/I, CICS and JCL workloads to Java that can run on AWS, Oracle Cloud, other clouds or on IBM Z itself. Vendor-described; an AWS partner blog covers one COBOL and CICS project on AWS.
ReplatformRefactor- Modernizes
- COBOL, PL/I, JCL, CICS, Assembler, Mainframe (z/OS) to AWS, Oracle Cloud, IBM Z, Java
- Firm profile
- Boutique · Alamo, CA, USA (Dublin, Ireland office)
- Typical engagement band
- Small · $80K–$150K
- Internal research links
- AWS Mainframe Migration: Cost, Timeline & Approaches
Public evidence for this capability
Replatform CICS COBOL to Java on AWS
z/OS CICS application of 3.8 million lines of COBOL and Assembler, with VSAM files and Db2 to Java on JBoss running on Amazon EC2, with Microsoft SQL Server on Amazon RDS
AWS, Cognizant and Heirloom's CEO report that Venerable's agent-management application was replatformed to Java on AWS using Heirloom's compiler-based tooling in 16 months, in production since June 2020, with a quote from Venerable's CIO.
Supplier responsibility: Heirloom supplied the conversion software and Probe discovery tool; Cognizant was the delivery partner.
Evidence limit: Published July 2021 on the AWS Partner Network blog and co-authored by Heirloom's CEO, so it is not independent of the supplier; the cost and schedule figures are the authors' own.
Supplier-reported case study · How Venerable Accelerated Growth by Modernizing its Mainframes on AWS
Source published or updated · Source checked
IBM Consulting
AgencyIBM Consulting describes application modernization on z/OS and Linux for IBM Z, workload migration to cloud or distributed platforms, and mainframe integration services.
Refactor- Modernizes
- COBOL, CICS, CA Gen to IBM Z, Linux for IBM Z, Cloud or distributed platforms
- Firm profile
- Enterprise · Armonk, NY, USA (global)
- Typical engagement band
- Enterprise · $400K–$800K
- Internal research links
- COBOL to Java Migration Services, COBOL Migration Services
Public evidence for this capability
Modernize on IBM Z
IBM z/OS applications to IBM z/OS; Linux for IBM Z
IBM Consulting describes services to modernize applications on z/OS and Linux for IBM Z, alongside services to migrate workloads to cloud or distributed platforms.
Supplier responsibility: Delivery firm providing assessment, application modernization and migration services.
Evidence limit: Service description; it does not identify a completed customer migration or establish a preferred platform for every workload.
Official capability documentation · End-to-end mainframe application modernization
Source publication date not stated · Source checked
Enable mainframe API integration
BCC Iccrea mainframe core banking applications on IBM Z to IBM Z with z/OS Connect invoking external REST APIs
IBM reports that BCC Iccrea connected existing core banking applications to external services using z/OS Connect while retaining IBM Z.
Supplier responsibility: IBM Consulting and IBM Technology Expert Labs designed the hybrid solution; IBM Technology supported implementation.
Evidence limit: IBM-hosted customer story; this is API integration on IBM Z, not evidence of a mainframe exit or code conversion.
Supplier-reported case study · Seamless mainframe integration unlocks new opportunities
Source publication date not stated · Source checked
IBM watsonx Code Assistant for Z
PlatformIBM Z coding assistant for COBOL comprehension, documentation and Java transformation; the NOSI case documents comprehension and a decision to remain on IBM Z.
Refactor- Modernizes
- COBOL to IBM Z, Java
Public evidence for this capability
Assist COBOL-to-Java transformation
COBOL applications on IBM Z to Java services interoperating with IBM Z runtimes
IBM documents COBOL-to-Java transformation and generated unit tests comparing the Java service with the original COBOL; PL/I support includes analysis, explanation and refactoring.
Supplier responsibility: IBM coding assistant product used by developers; separate from IBM Consulting delivery services.
Evidence limit: Product capability description, not proof of a completed customer conversion; PL/I refactoring should not be read as documented PL/I-to-Java transformation.
Official capability documentation · IBM watsonx Code Assistant for Z
Source publication date not stated · Source checked
Understand COBOL before platform decisions
NOSI monolithic COBOL applications on IBM Z to Retained IBM Z estate upgraded to IBM z16
IBM reports that NOSI piloted the product on two COBOL applications for comprehension and documentation, then chose to modernize on IBM Z rather than exit the platform.
Supplier responsibility: watsonx Code Assistant for Z supplied code analysis and documentation assistance to NOSI developers.
Evidence limit: IBM-hosted customer story; it does not document production COBOL-to-Java conversion or an independent verification of the reported productivity gains.
Supplier-reported case study · Modernizing with IBM Z and watsonx Code Assistant for Z
Source publication date not stated · Source checked
Infosys
AgencyThe Cobalt suite covers mainframe and automated AS/400 modernization as a managed service, aimed at risk-averse enterprises that want the program run for them.
ReplatformRefactor- Best for
- Comprehensive managed services
- Modernizes
- COBOL, RPG, IBM i (AS/400), Mainframe (z/OS) to AWS, Azure
- Firm profile
- Enterprise · Global (India HQ)
- Typical engagement band
- Enterprise · $400K–$800K
Intellias
AgencyAutomated COBOL parsing with documented 98% accuracy on large codebases — positioned for 500k+ LOC estates with dense business logic.
Refactor- Best for
- Large codebases (500k+ LOC) with complex business logic
- Modernizes
- COBOL to Java
- Firm profile
- Enterprise · Ukraine (Global)
- Typical engagement band
- Enterprise · $400K–$800K
- Internal research links
- COBOL to Java Migration Services
Kyndryl
AgencyThe largest IT infrastructure services provider, spun off from IBM; its mainframe practice is built around optimize-and-coexist and managed IBM i operations rather than a forced exit.
ReplatformRetain & optimize- Best for
- Operational stability during transition
- Modernizes
- RPG, IBM i (AS/400) to AWS, Azure
- Firm profile
- Enterprise · Global
- Typical engagement band
- Enterprise · $400K–$800K
- Internal research links
- AS/400 to Cloud Migration Services
Micro Focus
PlatformThe tooling layer many other vendors' migrations run on: Visual COBOL executes COBOL on .NET and the JVM, and Enterprise Analyzer is used for legacy code assessment. Both are now sold as Rocket Visual COBOL and Rocket Enterprise Analyzer after Rocket Software bought OpenText's Application Modernization and Connectivity business in 2024.
ReplatformRefactorRetain & optimize- Best for
- Hybrid modernization approaches
- Modernizes
- COBOL to .NET, JVM
- Firm profile
- Enterprise · Global
- Typical engagement band
- Enterprise · $400K–$800K
- Internal research links
- COBOL Migration Services
Modern Systems
PlatformMainframe application modernization from the team that began as Modern Systems, was bought by Advanced in 2019, and moved to IBM Consulting under IBM's 2024 deal. Historically positioned on replatforming and emulation onto x86 without rewriting COBOL; IBM lists assessment, transformation, integration and deployment services.
RehostReplatformRefactor- Best for
- Keep COBOL code, run on x86
- Modernizes
- COBOL to x86
- Firm profile
- Enterprise · USA
- Typical engagement band
- Enterprise · $400K–$800K
- Internal research links
- COBOL Migration Services
Scalo
AgencyScalo's software migration page lists COBOL-to-Java among the language migrations it handles, and its blog discusses mainframe modernization on AWS. It publishes no mainframe-specific tooling, case study or customer reference.
- Modernizes
- COBOL to Java
- Firm profile
- Mid-size · Wrocław, Poland (US office in Plano, TX)
- Typical engagement band
- Mid-market · $180K–$350K
SoftServe
AgencySoftServe's Adaptive Modernization Platform (SAMP) is a platform-as-a-service accelerator for moving workloads to AWS and Azure, built on services such as Amazon EKS, ECS and Lambda and on Azure Kubernetes Service. SoftServe's SAMP material does not describe a mainframe-specific scope; its strongest verticals are healthcare and retail.
ReplatformRefactor- Best for
- Refactoring to microservices
- Modernizes
- Mainframe (z/OS) to AWS, Azure
- Compliance & regulated delivery
- Healthcare
- Firm profile
- Enterprise · Global (Ukraine Origins)
- Typical engagement band
- Enterprise · $400K–$800K
- Internal research links
- COBOL to C# Migration Services, AWS Mainframe Migration: Cost, Timeline & Approaches
TCS
AgencyThe MasterCraft suite applies intelligent automation to legacy conversion at scale — currently migrating over 50 million lines of COBOL to Java for a single financial-services client.
ReplatformRefactor- Best for
- Large-scale enterprise migrations
- Modernizes
- COBOL, RPG, IBM i (AS/400), Mainframe (z/OS) to AWS, Azure, Java
- Compliance & regulated delivery
- Banking, Insurance
- Firm profile
- Enterprise · Global (India HQ)
- Typical engagement band
- Enterprise · $400K–$800K
TSRI
AgencyJANUS Studio reaches near-total automation on rare source languages as well as COBOL, with the firm's delivery record concentrated in defense and government systems.
Refactor- Best for
- Defense and highly regulated government sectors
- Modernizes
- COBOL, Ada, Fortran, Jovial to .NET
- Compliance & regulated delivery
- Defense, Government
- Firm profile
- Boutique · USA
- Typical engagement band
- Small · $80K–$150K
- Internal research links
- COBOL to C# Migration Services
Which mainframe modernization companies are recognized for their security?
This page publishes named compliance evidence, never a security score. Scalo documents SOC 2 and HIPAA delivery in financial services. Deloitte runs risk, controls, and compliance advisory alongside the conversion. TSRI's record is concentrated in defense and government, TCS in banking and insurance, Cognizant in banking, healthcare, and life sciences.
For COBOL modernization services, which companies have the best expertise?
Expertise here means documented source-language coverage, not a rating we assign. TSRI handles Ada, Fortran, and Jovial alongside COBOL. AWS Mainframe Modernization adds PL/I and RPG. Astadia covers Unisys as well as IBM estates, and Heirloom Computing covers CICS. Filter the comparison above by the languages actually in your estate.
Which companies in mainframe modernization are underrated?
We do not rank, so no company here is rated or underrated. The question usually means the specialists rather than the global integrators: Astadia, Heirloom Computing, Scalo, and TSRI run pure-play mainframe practices, and the comparison table's team-size filter isolates the boutique and mid-size firms on this page.
Which IBM i modernization tools are best for a $50k budget?
No engagement band published for this domain starts at $50,000. The smallest, $80K–$150K, covers a single COBOL application under 50k lines. A budget at that level buys assessment, inventory, and dependency mapping rather than conversion — the cost benchmarks show what each band actually delivers.
Market map
Companies to evaluate for Mainframe Modernization
Scope: published mainframe modernization companies with documented category, migration-path, or service evidence in this research domain.
Last evaluated
208
Published modernization companies reviewed
22
Companies shown for mainframe modernization
Inclusion criteria: A company must have a published profile and documented category, migration-path, or service evidence in this domain. See the evidence threshold in our research methodology.
How to choose: Start with documented buyer fit (15 profiles) and specialty evidence (22), then narrow by team size (18) and location (19). Open a profile to verify the underlying experience before shortlisting.
This is an alphabetical market map, not an ordinal ranking. Inclusion is based on documented evidence and editorial review.
Mainframe modernization has two supplier layers: platforms and tools support discovery, automated transformation, emulation, integration, testing, or cloud execution; delivery firms supply COBOL and PL/I expertise, target architecture, data migration, validation, and long-running program governance. Evaluate tools by source-language coverage, conversion transparency, runtime dependency, and test evidence. Evaluate delivery firms by workload-scale experience, retained mainframe knowledge, target-platform capability, delivery capacity, and comparable outcomes. Companies appear alphabetically because the best fit depends on the chosen modernization path. The data layer is where these engagements are won or lost, and it is scoped separately from the code. VSAM, IMS, and DB2 records carry EBCDIC encoding and COMP-3 packed-decimal fields that have no direct equivalent in a relational target, so a firm's mainframe data modernization capability — schema conversion, encoding and precision handling, and reconciliation against the source — is a distinct question from whether it can convert COBOL. Ask for both separately.