We are looking for a highly skilled **Senior Performance Testing Engineer** to spearhead the design, execution, and analysis of performance testing strategies for scalable, high\-performance systems. In this role, you will develop and optimize performance testing frameworks, identify and resolve bottlenecks in web applications and APIs, and collaborate with cross\-functional teams to ensure our technology meets the highest standards of reliability and scalability. **Responsibilities** * Provide technical expertise in defining and implementing performance testing strategies, frameworks, and plans * Conduct comprehensive performance, load, stress, and endurance testing for web applications and backend APIs * Develop realistic workload models based on architecture and production usage patterns * Analyze and interpret performance test results using tools like k6 and sitespeed.io, identifying key performance metrics * Investigate and resolve performance bottlenecks across application, infrastructure, database, and network layers * Integrate performance test suites into CI/CD pipelines to ensure ongoing scalability and reliability * Utilize Grafana with InfluxDB to capture and visualize performance metrics for trend analysis and reporting * Monitor system resource utilization (CPU, memory, disk, network) during tests and identify misconfigurations * Automate performance testing processes, including test execution and reporting workflows, using scripting or programming tools like TypeScript or PowerShell * Collaborate with stakeholders to identify performance risks early and propose actionable solutions * Lead or contribute to performance tuning initiatives, ensuring the system meets required SLAs and scalability requirements * Mentor and guide team members to foster a performance\-first mindset and skills development **Requirements** * Proven experience of over 3 years in performance testing of web applications, APIs, and backend services * Strong knowledge of performance testing methodologies and best practices * Hands\-on expertise with k6; familiarity with sitespeed.io is a plus * Proficiency in analyzing test outcomes with metrics like percentiles, distributions, and system resource utilization * Experience using Grafana and InfluxDB for performance monitoring, visualization, and reporting * Knowledge of SQL with capabilities in query performance analysis and optimization * Competency in diagnosing and addressing bottlenecks across application, network, OS, and database layers * Understanding of infrastructure configurations, load balancing, and system monitoring tools * Skills in scripting or programming (e.g., TypeScript, PowerShell) for extending performance tests and custom automation * Experience integrating tests into CI/CD workflows with automated reporting tools * Strong communication skills in business English (B2 level or higher) to present findings to both technical and non\-technical audiences **Nice to have** * Familiarity with Prometheus for advanced monitoring and alerting * Experience with testing and optimization in REST and SOAP\-based services * Working knowledge of sitespeed.io for performance analysis and insights * Experience mentoring team members and promoting a performance\-focused culture **We offer** * Improved medical coverage \- EPAMers are eligible to participate in a supplementary health insurance program that shall have the usual coverage in the industry, with the Company funding 100% of the value of the monthly premium for participation * Lunch Allowance \- You will receive a daily allowance of CLP $ 7,000 per working day. Enjoy a nice meal on us * Allowance for internet and electricity \- You will receive an allowance of CLP $15,000 per month to cover internet and electricity expense * National Holiday Bonus \- We celebrate joining the Chilean Market. That is why all our employees will receive a bonus of CLP $86,646 in September * Christmas Bonus \- You will receive an End of Year bonus of CLP $170,539\. It will be paid during the month of December, to ensure you have a Happy Holiday! * Learning Culture \- We want you to be the best version of yourself, that is why we offer unlimited access to learning platforms, a wide range of internal courses, and all the knowledge you need to grow professionally * Additional Income \- Besides your regular salary, you will also have the chance to earn extra income by referring talent, being a technical interviewer, and many more ways * Are you open to relocation? \- If you want to relocate to another country and we have the right project, we will assist you every step of the way, to help you and your family, reach your new home