Senior Performance QA Engineer

• Design, develop, and maintain performance test scripts and scenarios for web, API, and back-end systems
• Define performance test strategies—including load, stress, endurance, scalability, and capacity tests
• Establish and maintain performance baselines and analyze test results over time to identify trends and performance regressions
• Use k6, an industry-standard tool, to create and execute tests
• Collect, analyze, and interpret performance metrics (CPU, memory, throughput, response time, latency, and error rates)
• Collaborate with DevOps and Engineering teams to define and use realistic test environments and datasets
• Identify system bottlenecks, performance degradation, and root causes through profiling and diagnostics
• Provide detailed performance test reports and recommendations for optimization
• Contribute to CI/CD integration of performance tests for ongoing validation
• Collaborate with Software Engineers, Architects, and Product Owners to ensure performance acceptance criteria are met
• Provide hands-on guidance, knowledge sharing, and training to the Product Team testers on the performance framework, testing execution, and result interpretation
• Participate in Agile/Scrum ceremonies, sprint planning, and release readiness assessments

• 2+ years of experience in performance testing or performance engineering
• Experience with new setups, determining measurements, and establishing baselines for multiple teams
• Hands-on experience with K6 (building and maintaining performance testing frameworks)
• Experience creating automated performance test suites for API, back end, and system-level components
• Ability to design performance tests for REST/SOAP APIs
• Expertise in validating throughput, latency, concurrency, resource utilization, and SLA compliance
• Strong understanding of performance testing concepts: load, stress, endurance, volume, and spike testing
• Experience with data-driven or modular performance test designs
• Familiarity with application performance monitoring tools (Grafana, New Relic, Dynatrace, AppDynamics, Datadog)
• Familiarity with profiling tools (GC analysis, thread dumps, heap dumps)
• Ability to analyze and interpret server and application metrics (CPU, memory, network, I/O, logs) to pinpoint performance issues
• Experience testing APIs and back-end services for performance and scalability
• Strong analytical and troubleshooting skills, especially around distributed systems
• Experience with CI/CD pipelines and repository management (Bitbucket, Jenkins, GitLab, GitHub)
• Ability to integrate performance tests into CI/CD pipelines (Bitbucket, Jenkins, GitLab CI, GitHub Actions)
• Familiarity with cloud platforms (AWS, GCP, Azure) and container technologies (Docker, Kubernetes)
• Understanding of infrastructure as code and environment provisioning (Terraform, Helm)
• Knowledge of networking fundamentals and distributed architecture constraints
• Experience automating performance smoke tests and baseline validations during deployment cycles
• Experience in designing performance scenarios that simulate peak load, sustained load, and failure conditions
• Strong understanding of system-level and architectural dependencies
• Skills in comprehensive root cause analysis and detailed performance reporting
• Ability to define performance testing scope, scenarios, workloads, and success criteria
• Ability to model real-world user behavior and traffic patterns
• Proficiency in risk-based planning to identify high-impact test areas
• Ability to use Jira to manage performance-related defects
• Experience collaborating closely with Software Engineers and Architects to drive performance fixes
• Experience creating and executing test plans, test cases, and performance testing documentation
• Skills in defining and tracking KPIs such as response times, error rates, throughput, resource utilization, and scalability
• Ability to communicate performance test outcomes clearly to technical and non-technical stakeholders
• Experience with scripting languages such as JavaScript, Python, Groovy, or Java
• Ability to build reusable test components and parameterized test scripts
• Familiarity with object-oriented programming concepts
• Ability to work collaboratively in a fast-paced engineering environment
• Bachelor’s degree in Computer Science, Engineering, or a related field (or equivalent experience)
• Excellent verbal and written communication skills
• English level – Upper-Intermediate or higher

Experience with performance testing tools such as JMeter, Gatling, or LoadRunner

• Remote-first work model with flexible working hours (we provide all equipment)
• Comfortable and fully equipped offices in Lviv and Rzeszów
• Competitive compensation with regular performance reviews
• 18 paid vacation days per year + all state holidays
• 12 days of paid sick leave per year without a medical certificate + extra paid leave for blood donation
• Medical insurance with an affordable family coverage option
• Mental health program which includes free and confidential consultations with a psychologist
• English, German, and Polish language courses
• Corporate subscription to learning platforms, regular meetups and webinars
• Friendly team that values accountability, innovation, teamwork, and customer satisfaction
• Inclusive environment where everyone feels valued and treated equally. We proudly partner with VeteranHub to support Ukrainian veterans
• We are committed to supporting Ukraine and actively participate in charity initiatives