Contract & schema testing
Versioned contract validation that catches breaking changes in CI, while they're still cheap to fix and yours to schedule.
Quality Engineering
Your APIs are your product. Test them like it.
The worst API defect report comes from outside: a partner's production broke on your release day, and their users blame them. UI tests exercise one happy path through an API that dozens of consumers hit in ways your UI never will. We test the API as the product it is: contracts, error paths, and every consumer's view of every change.
Independent quality engineering & cybersecurity since 2020, with 100+ security & quality engineers, delivering on platforms we build and run ourselves.
One broken endpoint fails every consumer at once, and every silent contract change is a breaking change for somebody. Integration partners keep long memories of whose release broke them, and so do the procurement teams they compare notes with.
What we do
Functional & negative testing
Beyond 200-OK: auth failures, malformed payloads, pagination edges, idempotency, and error-body correctness across REST, GraphQL, and event-driven services.
Integration-flow testing
Multi-service scenarios that mirror real consumer behavior, covering sequences, retries, and partial-failure handling, so the sequence that would break a partner breaks a test instead.
Performance baselines
Latency and throughput baselines per endpoint, so a regression surfaces as a number in a build before it becomes a complaint in production.
How it’s delivered
01
Inventory
Map the API surface, consumers, and contracts, including the undocumented endpoints.
02
Design
Coverage plan by endpoint criticality; agree what CI gates on.
03
Automate
Suites built in your stack, running against every build.
04
Baseline
Performance and contract baselines tracked release over release.
Tools & standards
- Frameworks our engineers work in
- Postman/Newman, REST Assured, Playwright API, k6
- Contract & schema
- OpenAPI/Swagger validation, GraphQL schema checks
What you receive
- An automated API regression suite in your CI
- Contract validation gates that catch breaking changes pre-release
- Endpoint-level coverage and latency baselines
- Defect reports with request/response evidence and repro scripts
Engagement
Ways to engage the same senior bench
Buy it as a scoped project, embed it in your team, or run it as a managed service. The engineers and the governance stay the same, whichever shape fits.
Scoped project
A defined piece of work with a fixed outcome (a test suite built, a release hardened, a backlog cleared), delivered by our team and handed over with documentation.
Embedded QE
Our engineers work inside your sprint teams, on your tools and cadence, owning quality alongside your developers rather than testing from the outside.
Managed QE service
We own the discipline as an ongoing service (coverage, execution, and reporting), scaling the bench up or down as your release pressure moves.
Who this is for
- Platform teams whose APIs have more consumers than their test suite has cases
- Product companies whose partners integrate against versioned public APIs
- Teams adopting microservices and discovering integration defects the hard way
Common questions
How does this relate to API security testing?
This is functional and contract testing: does the API behave correctly for its consumers. API security testing is the adversarial counterpart. Many clients run both; they share the endpoint inventory.
Do you test event-driven and GraphQL APIs, or just REST?
All three. Contract, integration, and negative testing across REST, GraphQL, and event-driven or message-based services. The schemas and failure modes differ, so the test design does too.
Can this run in our CI pipeline?
API suites are built to run on every merge, so a breaking contract change is caught by the pipeline before a downstream consumer finds it in production. VirtueATLAS accelerates authoring where it helps, but the suite runs in your CI on your terms.
Who actually does the work?
Senior engineers from our own bench: 63% hold industry certifications (CISSP, CEH, eCPPT, ISTQB, AWS). The people who scope your engagement are the people who run it; there is no rotating offshore bench behind the proposal.
One practice, one loop
This is one stage of a single assurance loop: findings become regression tests, and their indicators become live detections, so a problem, once fixed, can’t quietly come back. A stack of separate vendors has no way to close that loop. See how the loop connects →
Before the next breaking change ships
Bring your API inventory, even a rough one. A QE lead maps where contract gates and consumer-shaped tests would catch the regressions your UI suite never sees.