Senior Software Tester (contract)

Mirantis; Polska; On-site; PLN 180,000 - 240,000; Full time

Job summary

A leading cloud-native technology company based in Poland seeks a Senior QA Engineer to drive QA strategy in Kubernetes and cloud-native environments. You will lead risk analysis, architect test frameworks, and mentor peers. The role requires deep Kubernetes knowledge and 10+ years of experience in software testing. We offer a competitive compensation package and a dynamic work environment focused on innovation.

Benefits

Professional development and training

Competitive compensation package

Customized workstation (macOS, Windows)

Qualifications

• 10+ years in software testing or quality engineering roles.
• 4+ years focused on Kubernetes and cloud-native applications.
• Exceptional problem-solving and architectural thinking.

Responsibilities

• Contribute to driving overall QA strategy.
• Architect test frameworks for microservices validation.
• Promote test infrastructure as code.

Skills

Leadership experience

Scripting capabilities (Python, Bash)

Kubernetes internals knowledge

Cloud architecture understanding (AWS, Azure, GCP)

Observability stacks familiarity (Prometheus, Grafana)

Problem-solving skills

Communication skills

Education

Bachelor's or Master's degree in Computer Science or Engineering

Tools

Kubernetes

Docker

CI/CD tools (Jenkins, GitHub Actions)

Helm

Job description

Company Description
Mirantis is the Kubernetes-native AI infrastructure company, enabling organizations to build and operate scalable, secure, and sovereign infrastructure for modern AI, machine learning, and data-intensive applications. By combining open source innovation with deep expertise in Kubernetes orchestration, Mirantis empowers platform engineering teams to deliver composable, production-ready developer platforms across any environment—on-premises, in the cloud, at the edge, or in sovereign data centers. As enterprises navigate the growing complexity of AI-driven workloads, Mirantis delivers the automation, GPU orchestration, and policy-driven control needed to manage infrastructure with confidence and agility. Committed to open standards and freedom from lock-in, Mirantis ensures that customers retain full control of their infrastructure strategy.

Job Description

Key Responsibilities

• Contribute to driving the overall QA strategy for Kubernetes and cloud-native environments, aligning quality goals with business objectives and release deadlines.
• Evaluate and champion best-in-class testing best practices and frameworks for distributed systems.
• Lead risk analysis and test planning for large-scale, multi-cloud infrastructure and container orchestration.
• Architect test frameworks and infrastructure for validating microservices and infrastructure components in multi-cluster and hybrid-cloud environments.
• Oversee the design of complex test scenarios simulating production-like workloads, resource scaling, failure injection, and recovery across distributed clusters.
• Spearhead the development of scalable and maintainable test automation integrated with CI/CD (Jenkins, GitHub Actions, etc.).
• Leverage Kubernetes APIs, Helm, and service mesh tools to build comprehensive automation coverage, including system health, failover behavior, and network resilience.
• Promote test infrastructure-as-code and drive IaC forward on the team making sure the infrastructure code is repeatable, extensible and reliable.
• Mentor QA engineers and developers in advanced testing techniques such as risk-based testing, chaos engineering, performance and load testing etc.
• Serve as the QA authority in design reviews, production readiness assessments, and incident retrospectives (escaped defects).
• Collaborate with and DevOps engineers to refine monitoring, alerting, and debugging strategies for testing automation being run in CI/CD.
• Establish quality gates, release readiness metrics, and data-driven feedback loops to ensure released software is production quality.
• Drive initiatives to integrate performance, security, and chaos testing into the development lifecycle.
• Advocate for a culture of quality across teams and influence architecture decisions with testing in mind.

Qualifications

• Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field.
• 10+ years in software testing or quality engineering roles, with 4+ years focused on Kubernetes, cloud-native applications, and distributed systems.
• Proven leadership experience in building and scaling test strategies in enterprise-grade environments.
• Deep understanding of Kubernetes internals, cluster lifecycle management, Helm, service meshes (e.g., Istio or Linkerd), and network policies.
• Strong scripting and automation capabilities (Python, Pytest, Bash, etc.).
• Familiarity with observability stacks (Prometheus, Grafana, Jaeger), Kubernetes security (RBAC, secrets management), and performance benchmarking tools (e.g., K6).
• Solid grounding in cloud architecture (AWS, Azure, GCP), infrastructure provisioning, and containerized CI/CD.
• Moderate to advanced Linux knowledge and proficiency is required: Bash scripting and debugging, systemd/logs, networking/firewalling/routing, certificate/PKI management, containers (Docker/containerd), and Kubernetes tooling (kubectl/Helm with OCI registries, GitOps/Flux) to install, test, and troubleshoot multi-cluster environments.
• Exceptional problem-solving and architectural thinking.
• Experience influencing cross-functional teams and senior leadership.
• Excellent verbal and written communication skills for technical and executive-level audiences.
• Mentorship and coaching of 1 or more junior members on the team especially around testing fundamentals, troubleshooting and automation.
• Contributions to open-source Kubernetes or QA tooling projects.
• Experience implementing chaos engineering in Kubernetes environments.
• Certifications such as CKA, CKAD, or AWS Certified DevOps Engineer.

Additional Information

• Work with an established Silicon Valley leader in the cloud infrastructure industry.
• Work with exceptionally passionate, talented and engaging colleagues, helping Fortune 500 and Global 2000 customers implement next-generation cloud technologies.
• Be a part of cutting-edge, open-source innovation.
• Thrive in the high-energy environment of a young company where openness, collaboration, risk-taking, and continuous growth are valued.
• Professional development and training.
• Attend conferences and working groups.
• Customized workstation (macOS, Windows).
• A competitive compensation package with strong benefits plan and stock options.

It is understood that Mirantis, Inc. may use automated decision-making technology (ADMT) for specific employment-related decisions. Opting out of ADMT use is requested for decisions about evaluation and review connected with the specific employment decision for the position applied for. You also have the right to appeal any decisions made by ADMT by sending your request to [e-mail]

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