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Five9

Performance Test Engineer

Five9

Performance Test Engineer for Five9 designing and executing performance tests on cloud contact center platform. Collaborating with teams to enhance product performance and reliability.

Posted 7/16/2026full-timePorto • 🇵🇹 PortugalMid-LevelSeniorWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in performance testing and engineering, with a strong focus on developing and maintaining test scripts using tools like k6, Gatling, and JMeter. Proficient in integrating performance tests into CI/CD pipelines and utilizing application performance monitoring tools to analyze results and communicate findings effectively.

Highest-signal resume keywords
Performance TestingTest Script DevelopmentCI/CD IntegrationApplication Performance MonitoringAI/ML Concepts in Testing

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Performance TestingTest Script DevelopmentWorkload ModelingPerformance Test TypesPythonJavaScript/Node.jsJavaGatlingJMeterK6
Soft Skills
Strong Communication SkillsCollaborationAnalytical Thinking
Tools & Technologies
DatadogGrafanaPrometheusJenkinsGitLab CIGitHub ActionsAIOps PlatformsAI-Assisted Tooling
Industry Keywords
Performance EngineeringLoad TestingStress TestingScalability TestingWeb ApplicationsAPIsObservability

Tech Stack

Tools & technologies
GrafanaGroovyGRPCJavaJavaScriptJenkinsJMeterNode.jsPrometheusPython

About the role

Key responsibilities & impact
  • Design, develop, and maintain performance test scripts and scenarios using tools such as k6, Gatling, JMeter, or Python
  • Build and maintain realistic workload models that accurately represent production traffic patterns and user behavior
  • Define and document performance test objectives, entry/exit criteria, and service level objectives (SLOs)
  • Execute a range of test types including baseline, load, stress, soak, spike, and scalability tests
  • Analyze test results to identify bottlenecks, regressions, and areas of concern; produce clear written findings and recommendations
  • Collaborate closely with developers, QA engineers, and architects to share results and support remediation efforts
  • Set up and maintain performance test environments and test data in alignment with production configurations
  • Integrate performance tests into CI/CD pipelines to enable continuous performance validation
  • Define and configure monitoring dashboards and alert thresholds using observability platforms (e.g. Datadog, Grafana, Prometheus)
  • Triage performance-related defects and contribute to root cause analysis investigations
  • Maintain performance test documentation, test plans, and results archives
  • Leverage AI-assisted tooling for automated anomaly detection, intelligent baselining, and accelerated result analysis
  • Use AI/ML-powered AIOps platforms to identify trends, predict regressions, and reduce mean time to detection (MTTD) for performance issues

Requirements

What you’ll need
  • 4–7 years of hands-on experience in performance testing or performance engineering
  • Practical experience writing and maintaining test scripts in one or more of: k6, Gatling, JMeter, or equivalent
  • Solid understanding of performance test types and when to apply them (load, stress, soak, spike, scalability)
  • Experience defining workload models and translating production metrics into test scenarios
  • Proficiency with application performance monitoring tools (e.g. Datadog, New Relic, Grafana, Prometheus, AppDynamics)
  • Ability to interpret test results and thread/heap dumps, identify bottlenecks, and communicate findings clearly to technical and non-technical stakeholders
  • Experience integrating performance tests into CI/CD pipelines (e.g. Jenkins, GitLab CI, GitHub Actions)
  • Scripting or programming skills in at least one language (Python, JavaScript/Node.js, Java, or Groovy)
  • Familiarity with AI/ML concepts applied to testing: anomaly detection, intelligent baselining, AIOps, or LLM-assisted diagnostics
  • Experience testing web applications and APIs (REST, gRPC, WebSocket) under realistic concurrency
  • Strong written and verbal communication skills; ability to present findings and drive discussions with engineering teams

Benefits

Comp & perks
  • Five9 Shares
  • Bonus Scheme
  • 10% Flexi Benefit
  • Meal Allowance
  • Medical Insurance
  • Life Insurance
  • 25 day Annual Leave + Public Holidays