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. *We accept* *CVs in English only.* **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** * 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 * Health Coverage \- Health and wellness are important, that is why we have you and up to four family members in a premiere health plan. We have a couple of options, so you can choose what is best for you and your family * Visual Benefit \- Seeing your work for us would be a sight for sore eyes. We want your vision to always be at 100% which is why we offer up to $200\.000 COP for any visual health expenses * Life Insurance Plan \- We have partnered with MetLife to offer a full\-coverage Ife insurance plan. So, your family is covered, even if you are gone. * Medical Leave Coverage \- We are one of the few companies that cover 100% of your medical leave, for up to 90 days. Your health is the most important thing to us * Professional Growth Opportunities \- We have designed a highly competitive and complete development process, where you will have all the tools to get where you have always wanted to be, personally and professionally * Stock Option Purchase Plan \- As an EPAMer you can be more than just an employee, you will also have the opportunity to purchase stock at a reduced price and become a part owner of our organization * 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 * Community Benefit \- You will be part of a worldwide community of over 50,000 employees, where you can learn, challenge yourself, stand out, and share your knowledge and experience with multicultural teams! *Please note that even though you are applying for this position, you may be offered other projects to join within EPAM.* EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi\-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting\-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.