The Future of FederationConnect Everything Federate Anything
Cosmo Connect combines the strengths of GraphQL and gRPC.
Query all your APIs, connect every system. No complex rewrites or migrations.
From fragmented APIs to unified
GraphQL Federation
GraphQL as the foundation of a Microservices Architecture never felt right,
Cosmo Connect is here to fix that.
Schema Stitching
Gen 1: The FoundationApollo Federation
Gen 2: The Great LeapCosmo Connect
Gen 3: The EvolutionDesigned for LLM supported API Integration
Never write API glue code again.
Cosmo Connect is optimized for LLM code generation.
From Schema to Service
Three simple steps. Cosmo Router handles the complexity. Your code stays simple.
Design the Schema
Contract First
Declaratively define types, fields, and relationships
Generate Code
wgc Magic
Compile the schema into a gRPC Service proto definition
Implement gRPC
Simple & Fast
Build your service with generated stubs in any language
Code Transformation
See how your GraphQL schema becomes gRPC service code
GraphQL Schema
What you write
type Query { employee(id: ID!): Employee}
type Employee { id: ID! name: String! department: String}
Generated gRPC
What you implement
service EmployeeService { rpc QueryEmployee( QueryEmployeeRequest ) returns ( QueryEmployeeResponse );}message QueryEmployeeRequest { string id = 1;}message QueryEmployeeResponse { Employee result = 1;}
What Makes This Different
Beyond simplicity, this approach delivers real business value
Lightning Fast Development
Schema changes automatically generate new service contracts. No manual protobuf wrestling, no version conflicts.
End-to-End Type Safety
Types flow seamlessly from GraphQL schema through generated code to your service implementation.
Any Language, Any Stack
Implement services in Go, Rust, Java, Python, or whatever makes your team productive.
Simple Service Logic
No GraphQL complexity in your services. Just clean RPC methods that do one thing well.
Production Ready
All complexity lives in the router - query planning, DataLoader batching, performance optimization. Your services stay simple and focused.
Gradual Migration
Start with one service, migrate at your own pace. No big bang rewrites required.
The best part? Your frontend never knows the difference. It's still GraphQL all the way down, but your backend gets to be brilliantly simple.
Why gRPC First?
Connect translates GraphQL to gRPC because it's the sweet spot for modern service communication.
Performance
Binary wire format; avoid double GraphQL parsing at the service level.
Coverage
Great tooling across Rust, Java, Python, C#, Go, and more.
Simplicity
Clean RPC handling, no GraphQL internals
Choose Your Path
Modular Monolith, Microservices, or a mix of both. It's up to you.
Router Plugins
Speed- Co-located processes
- Publish via Cosmo registry
- Minimal ops overhead
- Ultra-low latency
Example: Stripe/Slack wrapper
gRPC Services
Control- Own deployments
- Independent scaling
- Any infra (LBs, k8s, serverless)
- Full operational control
Example: Employee/Identity service
Built for Enterprise
Unlock the power of federated GraphQL without forcing your teams to rewrite everything
No GraphQL Server Overhead
Simply implement gRPC contracts while the router handles federation complexity.
Leverage Existing APIs
Wrap existing REST, SOAP, or gRPC services without costly rewrites.
Work in Any Language
Build services in Go, Java, C#, Python, Rust thanks to gRPC ecosystem.
Simplified Development Workflow
Avoid GraphQL quirks with straightforward request/response semantics.
Flexible Extension Options
Choose Router Plugins for fast iteration or gRPC Services for full control.
Unified API for the Frontend
Single GraphQL interface while backend teams work independently.
Works for Any Architecture
Whether you're building from scratch or modernizing legacy systems, Connect adapts to your architectural reality
Greenfield Projects
Small RPC surface; move fast without GraphQL internals.
- Start with simple RPC contracts
- No GraphQL complexity in services
- Rapid iteration and deployment
Legacy Migration
Wrap REST/SOAP/monolith; keep investments; expose via Connect.
- Preserve existing investments
- Gradual modernization path
- Bridge old and new systems
Frequently Asked Questions
Everything you need to know about implementing gRPC services with GraphQL federation