Top 10 API & Integration Modernization Companies (2026)

Selection rule: every company below is one this site holds a research record for in api & integration modernization — a documented migration path, a service engagement, or a hub-scoped vendor profile — and the 10 that qualify are listed alphabetically, never ranked or scored. Paid Featured placements are labeled and do not change the ordering.

Approach labels below use the seven modernization options — which of the seven Rs fits an integration layer.

Updated 4 August 2026·Peter Korpak·Methodology

Compare api & integration modernization companies

Filter by what a company migrates from, its modernization approach, supplier type, team size, or region. Listed alphabetically — never ranked, scored, or rated. “Featured” is a labeled paid slot and does not change the ordering.

Migrates from:

Approach:

Supplier type:

Team size:

Region:

API & Integration Modernization company comparison: source stack, approach, supplier type, team size, region, and documented evidence
Company	Approach	Type	Team size	Region
AltexSoft	Approach—	TypeAgency	Team sizeMid-size	RegionUSA / Europe	Documented evidence0 documented sources
Cognizant	Approach—	TypeAgency	Team sizeEnterprise	RegionGlobal (US HQ)	Documented evidence0 documented sources
Endava	Approach—	TypeAgency	Team sizeEnterprise	RegionGlobal	Documented evidence0 documented sources
Grid Dynamics	Approach—	TypeAgency	Team sizeMid-size	RegionUSA / Global	Documented evidence0 documented sources
IBM Consulting	Approach—	TypeAgency	Team sizeEnterprise	RegionGlobal	Documented evidence0 documented sources
Intellias	Approach—	TypeAgency	Team sizeEnterprise	RegionUkraine (Global)	Documented evidence0 documented sources
N-iX	Approach—	TypeAgency	Team sizeMid-size	RegionEurope / Global	Documented evidence0 documented sources
PLANEKS	Approach—	TypeAgency	Team size—	Region—	Documented evidence0 documented sources
Techzert	Approach—	TypeAgency	Team size—	Region—	Documented evidence0 documented sources
Thoughtworks	Approach—	TypeAgency	Team sizeEnterprise	RegionGlobal	Documented evidence0 documented sources

“Documented evidence” counts the migration paths and services in this domain where we hold a relationship record for that company — each one links to the page it came from, under the company’s entry below.

What each company delivers in api & integration 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.

AltexSoft
Agency
A travel-tech specialist whose engineering team publishes technical comparisons of REST, SOAP, and GraphQL architectures, with its deepest real-world integration experience built on complex third-party distribution APIs such as Amadeus for travel and hospitality clients.
Firm profile
Mid-size · USA / Europe
Cognizant
Agency
A global strategic systems integration partner of MuleSoft, running API-led integration strategy, architecture, build, and legacy-platform migration onto the Anypoint Platform and CloudHub iPaaS.
Modernizes to
MuleSoft Anypoint Platform
Firm profile
Enterprise · Global (US HQ)
Endava
Agency
Legacy core-system assessment and re-architecture through its own patented Dava.X toolset, paired with published technical guidance on API management platforms — gateways, developer portals, lifecycle governance — using Apigee as a worked example.
Firm profile
Enterprise · Global
Grid Dynamics
Agency
Monolith decomposition into microservices on containers and Kubernetes — strangling legacy applications rather than rewriting them — as the core of its Application Modernization practice, citing 10x speed-to-market gains across Fortune 1000 implementations.
Modernizes
Monolith to Microservices, Kubernetes
Firm profile
Mid-size · USA / Global
IBM Consulting
Agency
Enterprise integration modernization delivered on IBM's own Cloud Pak for Integration, a container-native platform on Red Hat OpenShift that unifies API management, event streaming, and application and data integration under one control plane.
Modernizes to
IBM Cloud Pak for Integration, Red Hat OpenShift
Firm profile
Enterprise · Global
Intellias
Agency
A dedicated API Modernization Services practice that replaces outdated SOAP-based interfaces and monolithic integrations with governed REST, GraphQL, and event-driven APIs, secured with OAuth 2.0 and JWT.
Modernizes
SOAP, Monolith to REST, GraphQL, Event-driven APIs
Firm profile
Enterprise · Ukraine (Global)
N-iX
Agency
A System Integration Services practice that designs enterprise service buses and API-based integration layers connecting legacy and cloud-native systems, reporting data accuracy up to 98% across delivered integration projects.
Firm profile
Mid-size · Europe / Global
PLANEKS
Agency
Incremental API modernization rather than full rewrites — layering FastAPI and Celery/Redis around a stable Django core and isolating third-party integrations behind dedicated retry and caching layers — under its own API Modernization Services practice.
Techzert
Agency
An IBM ecosystem specialist running API management and integration-middleware migrations across Google Apigee, IBM API Connect, IBM App Connect, and Tyk, alongside legacy WebSphere MQ and Cloud Pak for Integration delivery.
Modernizes
IBM WebSphere MQ to Google Apigee, IBM API Connect, IBM App Connect, Tyk
Thoughtworks
Agency
API and legacy-service modernization through its AI/works agentic development platform, recently documented decommissioning legacy services for a client's platform foundation and applying deterministic AI-assisted engineering to modernize an enterprise system built on 25-plus backend APIs.
Firm profile
Enterprise · Global

Market map

Companies to evaluate for API & Integration Modernization

Scope: published api & integration modernization companies with documented category, migration-path, or service evidence in this research domain.

Last evaluated 4 August 2026

208

Published modernization companies reviewed

Companies shown for api & integration modernization

Consultancies & integrators 10

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 (0 profiles) and specialty evidence (10), then narrow by team size (8) and location (8). Open a profile to verify the underlying experience before shortlisting.

This is an alphabetical market map, not an ordinal ranking. Paid Featured placements are labeled and do not imply a recommendation.

API and integration modernization suppliers divide into platforms and delivery partners. Platforms provide API management, gateways, iPaaS, event streaming, service connectivity, and integration observability; consultancies and integrators inventory dependencies, design the target architecture, migrate interfaces, and establish governance. Compare platforms by protocol coverage, connectors, policy controls, deployment model, portability, and lifecycle cost. Compare partners by legacy middleware expertise, integration-scale evidence, security capability, delivery capacity, and location. The roster is alphabetical and should be filtered by architecture and program fit.