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Oleh Koren

Oleh Koren

Performance testing specialist with 7 years of experience delivering reliable and scalable applications. I design and implement performance testing strategies from scratch, identify bottlenecks, and provide actionable insights that improve system stability and user experience. Skilled in JMeter, BlazeMeter, Grafana, InfluxDB, Jenkins/TeamCity, and cloud environments (AWS, Azure). Experienced with monitoring and observability tools like Kibana, Telegraf, and Zabbix, enabling proactive issue detection and performance optimization. I help teams ensure their applications handle real-world traffic efficiently, reduce downtime, and meet business performance goals.
Provectus, Ukrainedev.to/oleh_korenoleh-koren
Black Friday: Would You Choose the Right Performance Test?
JSNation 2026JSNation 2026
Upcoming
Black Friday: Would You Choose the Right Performance Test?
Black Friday is one of the most challenging times for any system, as traffic can increase by four to ten times within a short period. Teams often prepare by running performance tests, but they may not be using the right testing method.In this talk, I will present a real-life situation where a system seems fine during testing but crashes when faced with actual conditions.The main problem isn't the system itself, but the way the test was set up.This topic is especially important for teams developing and expanding web applications, especially during high-traffic events like Black Friday.It bridges the gap between performance testing strategies and real-world system performance, while also considering business impact.
performance
Black Friday: Would You Choose the Right Performance Test?
Web Engineering Summit 2026Web Engineering Summit 2026
Upcoming
Black Friday: Would You Choose the Right Performance Test?
Black Friday is one of the most challenging times for any system, as traffic can increase by four to ten times within a short period. Teams often prepare by running performance tests, but they may not be using the right testing method.In this talk, I will present a real-life situation where a system seems fine during testing but crashes when faced with actual conditions.The main problem isn't the system itself, but the way the test was set up.This topic is especially important for teams developing and expanding web applications, especially during high-traffic events like Black Friday.It bridges the gap between performance testing strategies and real-world system performance, while also considering business impact.
performance