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Senior Software Tester

https://www.soprasteria.com Logo

Sopra Steria

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Location:
Luxembourg , Leudelange

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

Not provided
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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
  • Part of a dynamic network of 56,000 professionals at all stages of their careers
  • Wide array of offices to explore

Additional Information:

Job Posted:
March 21, 2026

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