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Codemotives

QA & Testing Engineers

API Testing Engineers for Hire

Our API testing engineers verify that your services behave correctly, handle bad input gracefully and keep working as they change.

Get in touchHow we work

Overview

Hire API Testing Engineers

API testing engineers work at the layer beneath the user interface, where tests are fast and failures are easier to locate. They check request and response contracts, authentication, error handling, edge-case inputs and data integrity, and they automate those checks so every deployment is verified before consumers are affected. Everything is documented as we go, so the knowledge stays with your team rather than with individuals.

This is valuable for teams with many services, public APIs or mobile apps that depend on a stable back end. Our engineers work from your specifications, such as OpenAPI documents, and can help improve them. Engagements can be dedicated, part-time or project-based, with regular test reports. You stay informed throughout, with clear explanations of what is being done and why it matters.

Context

When to hire

  • 01

    Services change and clients break

    Without contract tests, an innocent change can break mobile apps or partners.

  • 02

    You expose a public or partner API

    Consumers rely on documented behavior, which must be verified continuously.

  • 03

    UI tests are slow and brittle

    Moving checks to the API layer gives faster, more stable feedback.

  • 04

    Error handling is untested

    Bad input, timeouts and permission failures often go unchecked.

Capabilities

Skills you get

  1. 01

    Contract and schema validation

    Verify responses against OpenAPI or JSON schemas.

  2. 02

    Functional API tests

    Cover endpoints, parameters, authentication and authorization rules.

  3. 03

    Negative and edge-case testing

    Send malformed, extreme and unauthorized requests to confirm safe behavior.

  4. 04

    Automation in CI

    Run collections and code-based suites on each build.

  5. 05

    Basic load checks

    Run simple performance tests to spot slow endpoints.

  6. 06

    Mocking and test data

    Set up stubs and data fixtures for repeatable results.

Typical work

  • REST API regression suites
  • Contract tests between services
  • GraphQL endpoint verification
  • Third-party integration checks
  • Pre-release API sign-off

Tools they use

  • Postman
  • REST Assured
  • Newman
  • Insomnia
  • SoapUI
  • JMeter
  • OpenAPI
  • WireMock

Approach

How hiring works

  1. 1

    Share your needs

    Tell us about your project, stack, team setup and the skills you are looking for.

  2. 2

    Review the match

    We suggest developers whose experience fits, and you can talk with them before deciding.

  3. 3

    Onboard

    Access, tools, communication channels and working hours are agreed up front.

  4. 4

    Build & review

    Work runs in your process with regular updates, and the team can scale as needs change.

FAQs

Common questions

Have a question that is not covered here? Get in touch.

Do you need our API documentation?

It helps a great deal. If documentation is thin, our engineers can derive behavior from the code and traffic, and help you document it.

Can you test GraphQL and SOAP as well as REST?

Yes, the approach adapts to the protocol, and we confirm the tooling during planning.

How are results reported?

Through CI reports and regular summaries of failures, coverage and risks, in the format you prefer.

Can we start small?

Yes. Many clients begin with their most critical endpoints and expand from there.

Explore

Keep exploring

Let's build what's next

Tell us about your idea, product or legacy system. Send us a message and we will help you scope the right next step.

Get in touch