Performance & Resiliency Test Engineer

Programmers.io; O’Fallon (MO); Hybrid; USD 90,000 - 130,000; Full time

Job summary

Programmers.io is seeking a Performance & Resiliency Test Engineer in O'Fallon, MO with hybrid work (4 days onsite, 1 day remote). This full-time/contract role focuses on validating functional behavior, transaction integrity, performance, failover, recovery, and production readiness of mission-critical systems.

The ideal candidate will bring expertise in performance engineering, resiliency testing, network protocols, and high-availability platforms, plus hands-on experience with automated

Qualifications

• Experience with performance engineering and resiliency 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.

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.
• 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.

Skills

Performance Testing

Resiliency Testing

Network Testing

Automation Testing

Load Testing

Soak Testing

Capacity Testing

High Availability

TCP/IP

Tools

Packet Analysis

Job description

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.
• 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.