Loopback Load Tester
A local and distributed HTTP load-testing CLI for measuring throughput, latency percentiles, success rates, and server failures under controlled concurrent traffic.
A CLI tool to measure API behavior under growing concurrency, designed for both local and distributed testing.
Software Engineer
Enabled reproducible performance benchmarks with CI-friendly exit codes and detailed latency reports.
Design & Architecture
The Challenge
Development teams need a reproducible way to understand how an API behaves as concurrency grows, while keeping tests scriptable for local workflows and scalable across several load-generating machines.
The Solution
Engineered a Node.js CLI with run, master, and worker commands; multi-process local execution; synchronized Socket.IO workers; weighted YAML/JSON scenarios; Bearer and custom-header support; p50, p95, and p99 latency metrics; configurable p95 and 5xx thresholds; CI-friendly exit codes; and sanitized JSON reports.
Key Features
- Local and distributed load generation
- Warm-up, ramp-up, and steady-state phases
- p50, p95, and p99 latency reporting
- CI-friendly thresholds and JSON reports
