Senior Backend Test Automation Engineer (Python, Java, Kafka)

Remote Romania | Luxoft | VR-125636

Luxoft is looking for a Senior Backend Test Automation Engineer to join an international team developing an in-house trading platform covering order management, execution and data analysis.

The platform is built on a distributed, event-driven backend. You will be responsible for designing and implementing automated testing solutions across APIs, microservices, messaging systems, databases and performance environments.

This is a hands-on engineering role involving framework development, backend automation, distributed systems testing and CI/CD integration.

What you'll do

• Design, develop and maintain backend test automation frameworks using Python and Java.
• Build automated tests for REST APIs, WebSocket services and Kafka producers and consumers.
• Test event-driven architectures, including message ordering, idempotency, retries, offsets and schema evolution.
• Develop integration, contract, service and data validation tests.
• Build and maintain isolated test environments using Linux, Docker, AWS and Infrastructure as Code.
• Perform performance, load, stress and resilience testing across services and messaging pipelines.
• Identify performance bottlenecks and investigate latency, throughput and database query performance.
• Integrate automated test suites into CI/CD pipelines using Jenkins or Azure DevOps.
• Ensure test reliability through structured logging, distributed tracing and effective failure analysis.
• Collaborate with backend engineers, infrastructure teams, business analysts and other stakeholders.
• Work closely with the UI SDET to develop a unified testing framework covering API, UI, messaging, databases and performance testing.

What we're looking for

Must have:

• 5+ years of experience in backend or service test automation, including test framework design.
• Strong Python skills, particularly pytest, requests and asyncio.
• Strong Java skills, including JUnit 5, REST Assured or similar testing frameworks.
• Working knowledge of TypeScript and Node.js.
• Hands-on experience with Apache Kafka, including producers, consumers, partitions, offsets and Schema Registry.
• Strong understanding of REST APIs, WebSockets, microservices and distributed systems.
• Solid networking fundamentals: TCP/IP, HTTP, TLS, DNS and troubleshooting tools such as Wireshark or tcpdump.
• Strong SQL and database testing experience, preferably with PostgreSQL or SQL Server.
• Experience with performance and load testing tools such as k6, Gatling, JMeter or Locust.
• Hands-on experience with Docker, Linux and AWS.
• Experience with CI/CD pipelines using Jenkins or Azure DevOps.
• Familiarity with Infrastructure as Code tools such as Terraform, CloudFormation or CDK.

Nice to have

• Experience in financial services, trading platforms, OMS/EMS or FIX protocol.
• Knowledge of kdb+/q or time-series databases.
• Experience with Kubernetes and Helm.
• Familiarity with contract testing, Pact or property-based testing.
• Experience with chaos engineering and fault injection.
• Knowledge of observability tools such as OpenTelemetry, Grafana and Prometheus.
• Experience working with large-scale distributed systems.

Location and work model

• Fully remote within Romania.
• Senior-level position.
• English: B2 or above.