Full Stack QA Engineer

We are looking for a Full Stack QA Engineer in Kazakhstan (hybrid, with office attendance) to join an international software development and outsourcing company and work on a project developing a secure, scalable payment platform and ensuring reliable payment processing and integrations.

Our customer is a large international technology organization operating in the digital infrastructure domain. It develops and maintains high-load platforms that process and manage significant volumes of data across multiple regions. The engineering landscape includes distributed systems, cloud-based environments, system integrations, and advanced security practices, with a focus on reliability, scalability, and continuous platform evolution.

The project is focused on developing and integrating a modern payment platform that supports secure and reliable payment processing and interaction with external systems. It includes scalable microservices, asynchronous transaction processing, payment status and error handling, with a strong emphasis on resilience, security, and high availability.

Responsibilities:

• Performing functional testing of payment services.

• Testing REST APIs and system integrations.

• Verifying interactions between microservices and external systems.

• Testing Kafka-based messaging and asynchronous event processing.

• Validating different payment transaction states, including success, decline, cancel, refund, pending, error, and others.

• Verifying correct transitions between payment states.

• Using SQL to validate transaction processing results.

• Cross-checking API responses, Kafka events, and database records.

• Developing and maintaining automated API tests.

• Testing retry mechanisms, timeouts, duplicate requests, and error recovery scenarios.

• Analyzing logs and tracing requests across services.

• Performing regression testing.

• Developing test scenarios and preparing test data.

• Reporting, documenting, and tracking…