API Development and Testing

A reliable API starts with the correct architecture and proven code. We offer a full cycle of API development and testing, including design, documentation, moc writing, unit and load tests, assembly and release automation.

Our goal is to make every integration predictable, secure and easily scalable.


What is included in the development process

StageDescription
API DesignREST/GraphQL/OpenAPI specifications, endpoint structure
DocumentationSwagger/Redoc, model descriptions, sample queries and responses
Mock serversGenerating fake responses to accelerate front-end development
CI/CD PipelinesAutomatic assembly, tests and API calculation

API Test Types

Type of testsAppointment
Unit-testsChecking the business logic of individual methods
Integration-testsChecking the interaction between components and the database
Contract-testsVerifying that API meets client expectations (e.g. Pact)
Load-testsLoad testing (k6, JMeter)
Security-testsChecking API for vulnerabilities (OWASP, fuzzing, tokens)

Tools and technologies

OpenAPI, Swagger, Postman
  • Jest, Mocha, Pytest, PHPUnit
  • Docker, GitLab CI/CD, GitHub Actions
  • OAuth2, JWT, keys and access tokens
  • Coverage, Log, and Response Time Metrics

What the business gets

Confidence in the quality of each integration
  • Fewer bugs and incidents in production
  • Fast onboarding of new partners or teams
  • Transparent architecture and documentation
  • Easy to maintain and refine API

Where especially important

Open API products for third-party developers
  • Financial platforms with critical operations
  • E-commerce and SaaS, where API is the basis of business
  • Internal microservices with complex logic

Quality API development and testing is an investment in stability and scalability. We create integrations that are easy to maintain, scale and develop - from first commit to production.

Contact Us

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