Test and Resiliency Engineer

Job Title: Senior Test and Resiliency Engineer
Job Location: St. Louis, MO
Job Type: Full-Time

Job Description:

• Build end-to-end test plans across representative lab and lower environments.
• Validate traffic movement and persistent TCP connections during planned maintenance and failure scenarios.
• Verify there is no unacceptable message loss, duplication, ordering issue, or customer-visible interruption.
• Execute functional, integration, regression, negative, failover, recovery, load, soak, and capacity testing.
• Validate proxy bypass and return-to-legacy recovery procedures.
• Reproduce defects, analyze logs and packet captures, and partner with developers on root-cause analysis.
• Define test evidence, acceptance criteria, certification results, and operational sign-off inputs.

Required Skills

• Resiliency, performance, network, and integration testing.
• TCP/IP and packet-level troubleshooting.
• Automated test frameworks and failure-injection techniques.
• Performance and capacity tools for high-throughput services.
• Strong defect analysis and technical documentation.

Preferred Experience

• Financial messaging, ISO 8583, payment switching, telecom, or other high-availability transaction platforms.

Proxy, load-balancer, network-service, or active-active failover testing