API & Integration Modernization

Thoughtworks is a global technology consultancy headquartered in Chicago. It was taken private by Apax Funds in a transaction announced complete on November 13, 2024. Martin Fowler, who works at Thoughtworks, named and described the Strangler Fig pattern after watching colleagues modernize legacy systems gradually. Its published client work centres on re-architecture and incremental modernization.

Techzert specializes in API modernization consulting across API management platforms including Google Apigee, IBM API Connect, and Open Tyk. It works with enterprises modernizing legacy SOAP systems to REST APIs and implements API gateway infrastructure for security, rate limiting, and analytics.

PLANEKS offers API modernization services built on Python frameworks (Django, FastAPI), GraphQL implementation, and cloud infrastructure. It helps organizations move from legacy REST APIs to GraphQL architectures, with security including OAuth 2.0, JWT, and RBAC.

N-iX is an Eastern European software engineering firm. It provides engineering talent for modernization projects, often at a lower price point than the major US/UK consultancies. Its work includes cloud and DevOps.

Intellias is a global technology services company serving Fortune 500 enterprises.

IBM Consulting delivers mainframe assessment, application modernization and migration services. Its mainframe services page includes both on-platform modernization and migration to cloud or distributed environments. The BCC Iccrea case study describes Consulting and Technology Expert Labs designing integration between IBM Z core banking applications and external REST APIs. This supplier-published case supports an API integration role, rather than a mainframe exit.

Grid Dynamics specializes in enterprise digital transformation, with a focus on retail and CPG. It modernizes monolithic commerce platforms into microservices-based cloud architectures.

Endava is a technology services company. It takes an agile approach to modernization, helping clients evolve their technology stacks iteratively, with a focus on breaking down monoliths and adopting cloud-native architectures to improve speed and scalability.

Cognizant is ranked #1 in Application Modernization by HFS. Its "Skygrade" platform uses generative AI and modern tooling to accelerate cloud-native transformations, particularly in banking and healthcare.

AltexSoft is a technology and solution consulting company that co-builds digital products. It is known for travel technology but serves various industries. Its modernization services focus on re-architecting legacy systems for scalability and performance, often involving data migrations and API integrations.