Quality engineering
API Testing Services
Functional, contract, integration and performance testing for your APIs: automated, fast and running in your pipeline on every change.
Test where the logic actually lives
Most of your product’s business logic sits behind its APIs. Testing only through the UI is slow, brittle and misses the cases users can’t easily reach.
We test APIs directly: checking behaviour, contracts, error handling, security-relevant edge cases and performance under load. The result is faster feedback and far fewer surprises in integration and production.
Our API tests are automated and run in your CI/CD pipeline, so a breaking change is caught minutes after it is made, not by a partner team or a customer.
What we deliver
Complete API test coverage
Functional API testing
Automated checks of endpoints, payloads, status codes and business rules, including the unhappy paths.
Contract testing
Verifying providers and consumers agree, so changes don’t silently break dependent systems.
Performance & load testing
k6 load, stress and soak tests that show how your APIs behave before real traffic does.
Security-focused testing
Authentication, authorisation, input validation and data exposure checks built into the suite.
How we work
Fast feedback at the right layer
- 01
Map the APIs
Understand endpoints, consumers, dependencies and the risks that matter most.
- 02
Automate core behaviour
Build functional and contract tests for the critical endpoints first.
- 03
Add performance
Define realistic load profiles and thresholds, and test against them.
- 04
Gate the pipeline
Run API suites on every merge so breaking changes never reach production.
Tools we work with
We use tools that fit your stack and keep tests close to the code.
- Functional
- Playwright API testingTypeScript
- Contracts
- OpenAPIContract testing
- Performance
- k6
- Pipeline
- CI/CD pipelinesDocker
FAQs
Common questions
Why test APIs instead of just the user interface?
API tests are faster, more stable and can reach cases the UI can’t. Testing at the API layer catches most business logic defects in seconds, leaving UI tests to focus on true end-to-end journeys.
What is API contract testing?
Contract testing checks that an API and the systems that consume it agree on requests and responses. It catches breaking changes before deployment, without needing every system running together.
Can you performance test our APIs?
Yes. We use k6 to run load, stress and soak tests against realistic traffic profiles and report clearly on response times, throughput and failure points.
Engineering confidence into digital delivery
Ready to Release with Greater Confidence?
Whether it’s quality engineering, automation, delivery assurance, AI-ready testing or sourcing the right people, let’s talk about where you are and where you want to be.