API & Integration Testing
Your UI might look perfect, but if the API behind it returns the wrong data, drops a payment or leaks a session token, none of that matters. We test every endpoint, every contract and every auth flow so your backend works exactly as it should.
The layer where real bugs hide, and most teams skip it
Your payment flow looks perfect in the browser. But what happens when the API returns a 200 with an empty body? Or when an expired token still grants admin access? Or when a third-party webhook silently fails? These are the bugs that make it to production, because nobody tested the API layer properly.
We go through every endpoint in your system, REST, GraphQL and gRPC alike, and validate the contracts, auth flows, error handling and data transformations that your UI tests can't see. If a microservice returns the wrong data or breaks a contract, we catch it before your users do.
Everything is automated and runs on every pull request. No one manually clicks through Postman collections. No one says "we'll add API tests later." From day one, your backend is covered.
Everything Included from Day One
Endpoint Testing
- All HTTP methods: GET, POST, PUT, PATCH, DELETE
- Request/response schema validation against spec
- Status code and error message verification
- Pagination, filtering and sorting validation
- Rate limiting and throttling behavior tests
Auth & Security Testing
- OAuth2, JWT, API key and Basic Auth flows
- Token expiry and refresh cycle validation
- Role-based access control (RBAC) testing
- SQL injection and XSS via API payloads
- Sensitive data exposure checks in responses
Contract Testing
- Consumer-driven contract tests with Pact
- Service-to-service integration validation
- Breaking change detection before deployment
- Schema versioning and backward compatibility
- Third-party API mock setup and validation
Integration & Workflow Testing
- End-to-end business workflows via API calls
- Database state assertions after every action
- Event-driven testing: Kafka, RabbitMQ, SQS
- Webhook delivery, retry and payload testing
- Microservice dependency mapping and validation
Reporting & Monitoring
- API coverage matrix: every endpoint tracked
- Response time trend analysis per endpoint
- Error rate dashboards with alert thresholds
- Automated regression reports on every deploy
Automation & CI/CD
- Full suite in Postman/Newman or Python requests
- CI/CD wiring: tests run on every PR automatically
- Mock servers for isolated, fast test runs
- Contract test automation with Pact framework
How We Actually Work
We Map Every Endpoint You Have
First, we inventory your entire API surface: endpoints, auth mechanisms, integrations and data contracts. If you have Swagger or OpenAPI specs, we use those as the baseline. If not, we create the documentation as we go.
We Design Tests That Go Beyond Happy Paths
For every endpoint, we build test cases covering success scenarios, error conditions, boundary values, security checks and edge cases. Each test is mapped to a requirement for full traceability.
We Mock Your Dependencies So Tests Run Fast
Third-party APIs like Stripe or Twilio shouldn't slow your tests or charge you money. We set up mock servers so your suite runs fast, reliably and independently of external services.
We Automate Everything Into Your Pipeline
We build the full suite in Postman/Newman, Python or REST Assured, whichever fits your stack, and wire it into your CI/CD pipeline. Tests run on every PR, every push, every deploy.
We Add Contract Tests Between Your Services
If you run microservices, we implement consumer-driven contract tests using Pact. This means each team can deploy independently without worrying about breaking another service's integration.
We Monitor and Catch Regressions Automatically
After setup, we configure API monitoring with alert thresholds. Any regression in response time, error rate or schema compliance triggers an immediate notification to your team.
Tools and Frameworks We Use
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Every Layer, Every Flow
REST APIs
All endpoints, methods and status codes
GraphQL APIs
Queries, mutations and subscriptions
gRPC Services
Protocol buffer and streaming validation
Auth Flows
OAuth2, JWT, API keys and RBAC
Microservice Contracts
Consumer-driven Pact contract tests
Webhooks
Delivery, retry and payload validation
Event-Driven Systems
Kafka, RabbitMQ, SNS/SQS testing
Third-Party APIs
Stripe, Twilio, Salesforce, AWS services
Database Integration
State assertions after every API call
What we test on this platform and the bugs we find: APIs and Microservices.
What Your Team Gains
Catch Bugs Early
API bugs caught at the integration layer are cheaper and faster to fix than bugs found in production.
Faster Development
Automated API tests give developers feedback on every code change.
Security Confidence
Every endpoint validated for auth vulnerabilities before it reaches production.
Contract Assurance
Service contracts tested automatically, with no more breaking changes between microservices.
Full Coverage Reports
Detailed coverage reports showing every endpoint status after every deployment.
CI/CD Integration
API test suite runs on every pull request, with zero manual trigger required.
Got questions?
Want to talk through your specific setup?
We'll walk you through how this works for your stack, team size and release cadence, with no commitment.
REST, GraphQL, gRPC, SOAP and WebSocket APIs. We also cover event-driven architectures using Kafka and RabbitMQ, webhook delivery testing and third-party API integrations.
