Senior Performance Test Engineer

Experian is a global data and technology company, powering opportunities for people and businesses around the world. We help to redefine lending practices, uncover and prevent fraud, simplify healthcare, create marketing solutions, and gain deeper insights into the automotive market, all using our unique combination of data, analytics and software. We also assist millions of people to realize their financial goals and help them save time and money.

We operate across a range of markets, from financial services to healthcare, automotive, agribusiness, insurance, and many more industry segments.

We invest in people and new advanced technologies to unlock the power of data. As a FTSE 100 Index company listed on the London Stock Exchange (EXPN), we have a team of 22,500 people across 32 countries. Our corporate headquarters are in Dublin, Ireland. Learn more at experianplc.com.

About the Role:

We’re looking for a seasoned Performance Test Engineer with 5+ years of hands-on experience in performance, reliability, and resilience engineering for modern cloud-native systems. You’ll design and execute end‑to‑end performance testing strategies across Load, Stress, Spike, Endurance, Capacity, Failover, DR, Chaos Engineering, Fault Injection, and Game Day exercises. You’ll be deeply technical and comfortable with tools like Apache JMeter, Locust, AWS Distributed Load Testing (DLT), and AWS Fault Injection Simulator (FIS).

Key Responsibilities Performance & Scalability

• Define and execute performance test strategies covering Load, Stress, Spike, Endurance, and Capacity testing.
• Build, maintain, and optimize test scripts using JMeter and Locust; parameterize, correlate, and modularize for reusability.

Reliability, Resilience & Recovery

• Design and run Failover, Disaster Recovery (DR), and Resilience tests to validate RTO/RPO, multi‑AZ/region failover, and recovery runbooks.
• Use AWS FIS to inject faults (network latency/packet loss, CPU/memory stress, AZ disruptions, instance terminations) and validate blast radius containment.
• Partner with SRE/Platform teams to define chaos hypotheses, measure steady state, and implement auto‑remediation and graceful degradation patterns.

Cloud & Observability

• Use AWS DLT to orchestrate scalable distributed load tests; automate workloads via CloudWatch Events, Step Functions, or pipelines.
• Instrument and analyze performance using Amazon CloudWatch, X‑Ray, and APM tools (Dynatrace/AppDynamics), plus Prometheus/Grafana.

Engineering & Automation

• Integrate performance tests into CI/CD (GitHub Actions/Azure DevOps/Jenkins/GitLab), with auto‑gating based on thresholds.
• Build utilities/frameworks for data generation, environment setup, and report automation (Python/Java).
• Analyze results (percentiles, tail latency, saturation), identify bottlenecks (DB, cache, network, I/O), and drive fixes with DevOps/Engineering.

Game Days & Readiness

• Plan and facilitate Game Day exercises simulating peak traffic, dependency failures, regional outages, and DR drills.
• Document test plans, hypotheses, playbooks, and post‑incident reviews with measurable improvements.

Nice to Have

• AWS Certification (Solutions Architect/Developer/SysOps/SRE) — plus.
• Experience with Kubernetes/EKS, service meshes (Istio), HPA/auto‑scaling, and pod/resource tuning.
• Knowledge of CDNs (CloudFront), Edge compute/Lambda@Edge, and WAF impacts on performance.
• Familiarity with security/perf trade‑offs, TLS tuning, connection pooling, and circuit breakers.

• B.E./B.Tech
• 5 to 7 years of experience in performance engineering for web, APIs, and distributed systems.
• Strong hands-on expertise with Apache JMeter and Locust (test design, correlation, parametrization, CI integration).
• Practical experience with AWS Distributed Load Testing (DLT) and AWS Fault Injection Simulator (FIS).
• Deep understanding of HTTP/HTTPS, WebSockets, REST, gRPC, and messaging systems (Kafka/SQS).
• Proficiency in Python and/or Java for scripting and custom extensions.
• Solid grounding in scalability patterns, caching (Redis/Memcached), databases (RDS/Aurora/DynamoDB), and CDN behavior.
• Hands-on experience with observability tools: metrics, traces, logs, dashboards, alerting (CloudWatch, X-Ray, Prometheus/Grafana, Datadog/New Relic).
• Experience executing Load, Stress, Spike, Endurance, Capacity, Failover, DR, and Chaos/Fault Injection tests and interpreting results.
• Ability to define SLIs/SLOs, capacity models, and performance budgets; strong data analysis and communication skills.

Our uniqueness is that we celebrate yours. Experian's culture and people are important differentiators. We take our people agenda very seriously and focus on what matters; DEI, work/life balance, development, authenticity, collaboration, wellness, reward & recognition, volunteering... the list goes on. Experian's people first approach is award-winning; World's Best Workplaces™ 2024 (Fortune Top 25), Great Place To Work™ in 24 countries, and Glassdoor Best Places to Work 2024 to name a few. Check out Experian Life on social or our Careers Site to understand why.

Experian is proud to be an Equal Opportunity and Affirmative Action employer. Innovation is an important part of Experian's DNA and practices, and our diverse workforce drives our success. Everyone can succeed at Experian and bring their whole self to work, irrespective of their gender, ethnicity, religion, colour, sexuality, physical ability or age. If you have a disability or special need that requires accommodation, please let us know at the earliest opportunity.

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