API & Integration Modernization Companies

AltexSoft is a technology & solution consulting company co-building digital products. They have a deep niche in Travel Tech but serve various industries. Their modernization services focus on re-architecting legacy systems for scalability and performance, often involving complex data migrations and API integrations.

Cognizant is ranked #1 in Application Modernization by HFS. Their "Skygrade" platform acts as a force-multiplier, utilizing generative AI and modern tooling to accelerate holistic cloud-native transformations, particularly in banking and healthcare.

Endava reimagines the relationship between people and technology. They are known for their agile approach to modernization, helping clients evolve their technology stacks iteratively. Endava focuses on breaking down monoliths and adopting cloud-native architectures to improve speed and scalability.

Grid Dynamics specializes in enterprise-level digital transformation, with a heavy focus on Retail and CPG sectors. They excel at modernizing monolithic commerce platforms into microservices-based cloud architectures.

The original creators of the mainframe. IBM Consulting is uniquely positioned to modernize IBM Z workloads using their "watsonx Code Assistant" for Z, which uses generative AI to translate COBOL to Java with high accuracy. Best for those staying in the IBM ecosystem or moving to Hybrid Cloud.

Intellias is a global technology partner to Fortune 500 enterprises and top-tier organizations.

N-iX is a leading Eastern European software engineering firm. They offer high-quality engineering talent for modernization projects, often at a more competitive price point than the major US/UK consultancies. Strong in Cloud and DevOps.

PLANEKS offers specialized API modernization services with a robust technology stack focused on Python frameworks (Django, FastAPI), GraphQL implementation, and cloud infrastructure. They excel at helping organizations transition from legacy REST APIs to modern GraphQL architectures while implementing enterprise-grade security including OAuth 2.0, JWT, and RBAC.

Techzert specializes in end-to-end API modernization consulting with deep expertise in major API management platforms including Google Apigee, IBM API Connect, and Open Tyk. They focus on enterprises modernizing legacy SOAP systems to REST APIs while implementing robust API gateway infrastructure for security, rate limiting, and analytics.

Thoughtworks pioneered many of the patterns used in modern software development, including the "Strangler Fig" pattern for legacy modernization. They are the premium choice for complex, strategic re-architecting where code quality and domain alignment are paramount.