Senior Quality Assurance Engineer (Event Streaming)

BUXAmsterdam AreaHybridFull-time3 weeks ago

BUX is seeking a Senior Quality Assurance Engineer (Event Streaming) to join their Backend Broker team in Amsterdam. The role focuses on validating the correctness, reliability, and resilience of Kafka-based event-driven systems in a fintech environment. Requires 5-7+ years of QA experience, hands-on Kafka testing, and strong automation skills with Selenium and Playwright/TypeScript.

What you'll do

Design, develop, and maintain automated and manual tests for Kafka-based producers, consumers, and event flows
Execute manual and exploratory testing where automation is not feasible
Integrate automated regression, smoke, and integration test suites into CI/CD pipelines (GitHub Actions)
Help build and mature QA processes and standards for event-driven systems within the squad
Apply quality gates and acceptance criteria in close collaboration with Product and Development teams
Participate in design reviews for owned features and event schemas to provide a QA perspective early in the development cycle
Monitor and track key quality metrics, test coverage, and defect trends for the streaming domain
Validate message ordering, delivery guarantees, idempotency, and exactly-once/at-least-once semantics
Validate producer and consumer contracts and schema compatibility as services evolve
Perform failure-mode and resilience testing — including broker failures, consumer lag, retries, dead-letter handling, and replay scenarios
Perform bug triage, reproduction, and prioritization with development teams
Support test environment setup, data provisioning, and maintenance in coordination with DevOps
Use approved GenAI tooling with sanitized data to accelerate test design and automation, subject to human review, security policies, and validation of generated tests

What you need

Must-have

Apache KafkaJavaKotlinSpring BootGCPKubernetesGitHub ActionsREST APIs

Nice-to-have

Performance TestingSecurity TestingKYC/AMLSchema RegistriesContract Testing

Soft skills

CommunicationCollaborationProblem SolvingAdaptabilityCritical Thinking

QA EngineerEvent StreamingKafkaFintechAutomation TestingSeniorHybridAmsterdamJavaPlaywright

/What you'll do

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Must-have

Nice-to-have

Soft skills

What you'll do

What you need