Senior Test and Resiliency Engineer

Position: Senior Test & Resiliency Engineer

Location: St. Louis, MO

Project Duration: 2 Years

Experience: 8 years

Job Type: Full time

Seniority

Senior/Test Architect, 8 years

Senior engineer or test architect, ordinarily 8 or more years of relevant experience.

Mission

Define and execute the validation strategy for functional behavior, transaction integrity, performance, failover, recovery, monitoring, and production readiness.

Core Responsibilities

• 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.