Performance Test Engineer | Load, Stress & Scalability Testing for Web Marketplace

We are looking for an experienced Performance Test Engineer to assess the scalability, stability, and performance of a modern web marketplace application. The application is built with a cloud-native architecture and integrates multiple third-party services. The goal is to identify performance bottlenecks, validate system behavior under different load conditions, and provide actionable recommendations to improve reliability. Scope The assessment should include: Load testing Stress testing Spike testing Endurance (Soak) testing Scalability evaluation Concurrent user simulation API performance testing Authentication performance (Google OAuth and email/password) Database performance analysis Payment workflow performance File upload/download performance (if applicable) Technology Stack Frontend deployed on Vercel Backend on Supabase PostgreSQL Google Authentication CRM integration PayPal integration CardNet payment gateway Deliverables Performance test plan Load model and workload assumptions Test scripts Execution report Response time analysis Throughput analysis Error rate analysis Resource utilization observations Bottleneck identification Performance recommendations Executive summary Required Experience Performance testing of SaaS or marketplace applications JMeter, k6, Gatling or Locust API performance testing PostgreSQL performance analysis Cloud-hosted applications Nice to Have Supabase experience Vercel deployments Payment gateway performance testing Google OAuth performance testing Expected Outcome Deliver a comprehensive assessment of the application's performance under realistic and peak workloads, including identified bottlenecks and recommendations to improve scalability before production release.