Performance & Resiliency Test Engineer
- O'Fallon
- |Contract
In office - WFH flexibility
Not Available
About the job
Job: Performance & Resiliency Test Engineer
Location: O'Fallon, MO, Hybrid (4 Days Onsite, 1 Day Remote)
Job Type: Full time/Contract
Skills: 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.
Responsibilities
- Develop 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 Skills
- Performance 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 Qualifications
- Experience 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.
