Senior Software Tester Job at Sopra Steria (Leudelange)

Job Description

We are looking for a Senior Software Tester with 10+ years of experience in testing Python-based backend systems, AI/LLM pipelines, API layers, and automated testing infrastructures. You will own the quality lifecycle end-to-end, from API entrypoints to full AI pipeline validation, helping ensure reliability, performance, and observability across production-grade systems. This role is intended for an expert tester capable of working autonomously, designing advanced automation strategies, and guiding teams in best practices for resilience, observability, and continuous validation.

Job Responsibility

Design, implement, and maintain automated test suites using pytest (fixtures, parametrization, asyncio)
Build end-to-end test coverage across UI, API layers, backend services, and AI/LLM pipelines
Implement browser and API E2E testing using Playwright
Develop contract and integration tests for REST and gRPC services
Detect and remediate flaky tests, ensuring long-term stability
Perform failure-injection testing (timeouts, malformed payloads, empty-response handling)
Validate auth flows: SSO, OAuth2, token-based access
Deep testing experience with Python systems: async patterns, package design, CLI tooling
Validate backend services built with FastAPI or equivalent
Work with containerized environments (Docker) and Kubernetes-based E2E topologies mirroring production
Integrate and validate CI/CD flows using GitHub Actions or GitLab CI
Implement and validate OpenTelemetry instrumentation (traces, logs, metrics)
Build latency and SLO/SLA assertions directly into test suites
Use Jaeger, Grafana, or similar platforms to analyse distributed traces and test regressions
Produce trace-based regression reports for AI pipeline executions
Ensure full lifecycle coverage from API trigger → backend logic → AI pipeline → validated output
Maintain containerized E2E test environments
Ensure reproducibility and alignment with production architecture

Requirements

10+ years Python development/testing (async, REST/gRPC, CLI tooling)
pytest ecosystem mastery (fixtures, parametrization, asyncio)
Playwright for UI/API E2E testing
Kubernetes, Docker, containerized test environments
Observability tooling (OpenTelemetry, Jaeger, Grafana)
CI/CD: GitHub Actions, GitLab CI
Knowledge of LLM/AI pipelines is a key asset
Excellent documentation and communication abilities
End-to-end problem solving and autonomy
Strong analytical skills and root-cause investigation capability
Ability to collaborate with architects, developers, and data teams in distributed environments

Nice to have

Experience with Agile methodologies
Experience working with EU Institutions is a strong plus
Experience with Atlassian Suite (Jira, Confluence)

What we offer

Extensive career development opportunities, both local and international
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Senior Software Tester

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