Senior Performance Test Engineer

125 - 145 PLN/ godz./ godz.B2BB2B (netto)

SeniorZdalnie·WrocławFull-time·B2B

#476112·Dodano wczoraj·1

Źródło: justjoin.it

Aplikuj teraz

Tech Stack / Keywords

K6REST API JavaScriptAzure DevOpsPrometheus Grafana CI/CD Git

Podsumowanie oferty

The Senior Performance Test Engineer will own end-to-end performance testing for an international project, from workload design through analysis and recommendations. The role uses k6, JavaScript, Azure DevOps, Prometheus and Grafana, working across Development, DevOps, QA and business teams.

Wymagania

Strong hands-on experience with performance testing and independently driving performance-testing activities end to end.
Strong practical knowledge of k6, including scripting, check(), metrics and thresholds.
Solid understanding of k6 workload models and executors, including the difference between VU-based and arrival-rate-based approaches.
Good working knowledge of JavaScript (ES modules) for building and maintaining modular test scripts.
Strong experience testing REST APIs, including HTTP methods, headers, session-token authentication and data correlation between requests.
Ability to interpret HTTP and application-level error codes and identify the source of performance-test failures.
Hands-on experience with Azure DevOps Pipelines, including running and parameterising tests, variables, conditions, artifacts and dedicated agents/pools.
Practical experience with Prometheus and Grafana, including performance-metric analysis and correlation.
Experience preparing and validating test data for performance testing.
Ability to translate business requirements into meaningful performance scenarios, workload models and acceptance criteria.
Strong analytical skills, including identifying bottlenecks, determining practical performance ceilings and distinguishing degradation from hard performance breaks.
Strong troubleshooting skills and the ability to distinguish between script, data, application, infrastructure and environment issues.
Experience producing clear performance reports and evidence-based recommendations without overinterpreting results.
Ability to take ownership of the performance-testing area and coordinate activities across multiple teams and dependencies.
Practical experience using AI tools to support performance-testing activities and critically validate AI-generated output.
Basic knowledge of Git and feature-branch workflows.
Strong written and spoken English, used comfortably in an international, cross-functional environment.

Nice to have:

Experience with Gatling.
Experience working in closed or isolated environments without direct internet or npm access.
Experience building and running prebuilt bundles, for example using esbuild.
Experience performance testing banking or fintech systems.
Experience with multi-country systems and country-specific configurations.
Familiarity with user onboarding and authentication flows, including registration, verification, login and session management.

Obowiązki

Own performance testing end to end, from requirements and test-data preparation through execution, analysis and final reporting.
Design performance scenarios based on business requirements, including transactions per hour, load tiers and acceptance criteria.
Build and maintain performance test scripts using k6 and JavaScript.
Select appropriate k6 workload models and executors for different performance scenarios.
Test REST API flows, including authentication, sessions and data correlation between steps.
Prepare and validate test data, including CSV feeders and sensitive data.
Run and parameterise performance tests through Azure DevOps Pipelines.
Export and analyse performance metrics using Prometheus and Grafana.
Correlate client-side test results with application and infrastructure metrics.
Identify bottlenecks, practical performance ceilings and root causes of failures.
Distinguish between script, test-data, application, infrastructure and environment issues.
Prepare clear performance reports and evidence-based recommendations for technical and non-technical stakeholders.
Identify risks and blockers early and propose appropriate mitigation.
Coordinate performance-testing activities across Development, DevOps, QA and business teams, working closely with the Project Manager and Release Manager.
Use AI tools to support script development, test-data preparation, log and result analysis, and reporting, while critically validating generated output.

CSHARK Sp. z o.o.

19 aktywnych ofert

Zobacz wszystkie oferty

Aplikuj teraz