Catch Breaking API Changes Before Your Users Do
Contract testing, schema validation, and load testing for your API layer — a 4-day sprint that bulletproofs your integration points.
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API & Integration Testing is a 4-day sprint that bulletproofs your API layer — the most common source of silent production failures in modern applications.
Why APIs Break Silently
APIs fail differently from UI bugs. There is no visual indicator, no error screen, no user complaining on Twitter. A breaking API change manifests as:
- A mobile app showing stale data because the response shape changed
- A webhook that stopped firing because the payload format was updated
- A partner integration that silently drops events because a field was renamed
- A payment flow that works in test but times out under real load
These failures are invisible until they become incidents. Contract testing makes them visible at PR time.
What Gets Tested
Contract tests — every critical API endpoint gets a consumer-driven contract test that validates request schemas, response shapes, error codes, and authentication flows. When someone changes an API, the contract test fails before the code merges.
Schema validation — if you have OpenAPI specs (or we generate them), we validate that your implementation matches your documentation. Schema drift is one of the most common sources of integration bugs.
Load testing — using k6 or Locust, we establish performance baselines for your critical endpoints, identify bottlenecks, and document your capacity limits. You will know exactly how many concurrent users your API can handle before it degrades.
Integration monitoring — for third-party integrations (Stripe, Twilio, Slack, etc.), we build health checks that verify connectivity, response times, and payload integrity.
Delivered in 4 Days
This is a fixed-scope API testing sprint. You get contract tests, schema validation, load test scripts, and CI/CD integration — all within one business week. Your API layer goes from “we hope it works” to “we know it works, and we’ll know immediately if it breaks.”
Engagement Phases
API Inventory & Risk Assessment
We catalogue your API surface area — internal endpoints, third-party integrations, webhooks, and event streams. Each endpoint is scored by business criticality, change frequency, and current test coverage to prioritise the sprint's scope.
Contract Tests & Schema Validation
We build contract tests for your highest-risk API endpoints — validating request/response schemas, error handling, authentication flows, and integration points. Tests are generated using AI from your OpenAPI specs or actual API traffic, then reviewed and hardened by our engineers.
Load Testing & CI/CD Integration
Load testing of your critical API endpoints using k6 or Locust — establishing performance baselines, identifying bottlenecks, and documenting capacity limits. All tests are integrated into your CI/CD pipeline with pass/fail thresholds.
Deliverables
Before & After
| Metric | Before | After |
|---|---|---|
| API Breaking Changes | Breaking changes discovered in production — rollbacks and hotfixes | Contract tests catch schema violations on every PR before merge |
| Integration Reliability | Third-party integration failures discovered via customer complaints | Automated monitoring of all integration points with alerting |
| Performance Visibility | No load testing — capacity limits unknown | Documented performance baselines with CI/CD-enforced thresholds |
Tools We Use
Frequently Asked Questions
Do you need access to our production APIs?
We work against your staging or development environment. For load testing, we need an environment that mirrors production architecture — a dedicated staging instance is ideal. We never run load tests against production unless explicitly requested and coordinated with your infrastructure team.
How much does API & Integration Testing cost?
Book a free discovery call to discuss your project scope and get a custom quote.
What if we don't have OpenAPI specs?
We can work from actual API traffic, Postman collections, or even your frontend code to reverse-engineer API contracts. Our AI tooling can generate OpenAPI specs from observed request/response patterns, which becomes an additional deliverable of the sprint.
Does this include GraphQL APIs?
Yes. We test REST, GraphQL, gRPC, and WebSocket APIs. For GraphQL, we validate schema consistency, query complexity limits, and N+1 query patterns in addition to standard contract and load testing.
Ship Quality at Speed. Remotely.
Book a free 30-minute discovery call with our QA experts. We assess your testing gaps and show you how an AI-augmented QA team can accelerate your releases.
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