{"schemaVersion":"jobsearcher.job.v1","id":"24b0dc651f8ece6d7ce18521","url":"https://jobsearcher.com/jobs/24b0dc651f8ece6d7ce18521","canonicalUrl":"https://jobsearcher.com/jobs/24b0dc651f8ece6d7ce18521","title":"Performance & Resiliency Test Engineer/Performance Engineer/Performance Tester","description":"Job: Performance & Resiliency Test EngineerLocation: O'Fallon, MO- OnsiteWork Model: Hybrid (4 Days Onsite, 1 Day Remote)- hybridSkills: Performance Testing, Resiliency Testing, Failover Testing, Recovery Testing, TCP/IP, Packet Analysis, Load Testing, Soak Testing, Capacity Testing, Network Testing, Automation Testing, High Availability, ISO 8583, Active-Active Architecture.Job SummaryWe are seeking a highly skilled Performance & Resiliency Test Engineer to define and execute validation strategies for functional behavior, transaction integrity, performance, failover, recovery, monitoring, and production readiness of mission-critical systems. The ideal candidate will have expertise in performance engineering, resiliency testing, network protocols, and high-availability platforms.ResponsibilitiesDevelop and execute end-to-end test plans across lab, staging, and lower environments.Validate traffic movement and persistent TCP connections during maintenance and failure scenarios.Ensure no unacceptable message loss, duplication, ordering issues, or customer-visible service disruptions.Perform functional, integration, regression, negative, load, soak, capacity, failover, and recovery testing.Validate proxy bypass and return-to-legacy recovery procedures.Reproduce defects, analyze logs and packet captures, and support root cause analysis.Define test evidence, acceptance criteria, certification results, and operational readiness sign-offs.Collaborate with development, infrastructure, and operations teams to improve system resiliency.Required SkillsPerformance Testing, Resiliency Testing, Network Testing, and Integration Testing.Strong TCP/IP networking and packet-level troubleshooting experience.Experience with automated test frameworks and failure-injection techniques.Hands-on experience with performance and capacity testing tools.Strong defect analysis, debugging, and technical documentation skills.Experience validating high-availability and failover architectures.Preferred QualificationsExperience with Financial Messaging, ISO 8583, Payment Processing, Telecom, or other high-availability transaction platforms.Knowledge of Proxy, Load Balancer, Network Service, and Active-Active Failover testing.Exposure to distributed systems and high-throughput transaction environments.","company":"Programmers.io","rawCompany":"programmersio","city":"O'Fallon","state":"MO","isRemote":false,"isActive":false,"createdAt":"2026-10-29T07:18:31.744Z","occupations":[{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"},{"code":"15-1253.00","title":"Software Quality Assurance Analysts and Testers","slug":"software-quality-assurance-analysts-and-testers"},{"code":"15-1244.00","title":"Network and Computer Systems Administrators","slug":"network-and-computer-systems-administrators"}],"industries":[{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"541519","title":"Other Computer Related Services","slug":"other-computer-related-services"},{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Performance & Resiliency Test Engineer/Performance Engineer/Performance Tester","description":"Job: Performance & Resiliency Test EngineerLocation: O'Fallon, MO- OnsiteWork Model: Hybrid (4 Days Onsite, 1 Day Remote)- hybridSkills: Performance Testing, Resiliency Testing, Failover Testing, Recovery Testing, TCP/IP, Packet Analysis, Load Testing, Soak Testing, Capacity Testing, Network Testing, Automation Testing, High Availability, ISO 8583, Active-Active Architecture.Job SummaryWe are seeking a highly skilled Performance & Resiliency Test Engineer to define and execute validation strategies for functional behavior, transaction integrity, performance, failover, recovery, monitoring, and production readiness of mission-critical systems. The ideal candidate will have expertise in performance engineering, resiliency testing, network protocols, and high-availability platforms.ResponsibilitiesDevelop and execute end-to-end test plans across lab, staging, and lower environments.Validate traffic movement and persistent TCP connections during maintenance and failure scenarios.Ensure no unacceptable message loss, duplication, ordering issues, or customer-visible service disruptions.Perform functional, integration, regression, negative, load, soak, capacity, failover, and recovery testing.Validate proxy bypass and return-to-legacy recovery procedures.Reproduce defects, analyze logs and packet captures, and support root cause analysis.Define test evidence, acceptance criteria, certification results, and operational readiness sign-offs.Collaborate with development, infrastructure, and operations teams to improve system resiliency.Required SkillsPerformance Testing, Resiliency Testing, Network Testing, and Integration Testing.Strong TCP/IP networking and packet-level troubleshooting experience.Experience with automated test frameworks and failure-injection techniques.Hands-on experience with performance and capacity testing tools.Strong defect analysis, debugging, and technical documentation skills.Experience validating high-availability and failover architectures.Preferred QualificationsExperience with Financial Messaging, ISO 8583, Payment Processing, Telecom, or other high-availability transaction platforms.Knowledge of Proxy, Load Balancer, Network Service, and Active-Active Failover testing.Exposure to distributed systems and high-throughput transaction environments.","datePosted":"2026-10-29T07:18:31.744Z","dateModified":"2026-10-29T07:18:31.744Z","hiringOrganization":{"@type":"Organization","name":"Programmers.io","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"O'Fallon","addressRegion":"MO","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"24b0dc651f8ece6d7ce18521"},"url":"https://jobsearcher.com/jobs/24b0dc651f8ece6d7ce18521"}}