Development and testing

API Development and Testing

A robust API starts with the right architecture and proven code. We offer a complete API development and testing cycle, 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

Stage	Description
API design	REST/GraphQL/OpenAPI specifications, endpoint structure
Documentation	Swagger/Redoc, model descriptions, sample queries and responses
Mock servers	Generating fake responses to accelerate front-end development
CI/CD pipelines	Automatic assembly, tests and API calculation

API Test Types

Type of tests	Purpose
Unit tests	Test the business logic of individual methods
Integration tests	Checking the interaction between components and the database
Contract tests	Verify that the API meets client expectations (for example, Pact)
Load tests	Load testing (k6, JMeter)
Security tests	Checking 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.