Engineering teams preparing for a major product launch, television appearance, national election/ticketing event, or enterprise onboarding frequently search to hire a freelance load testing (Grafana k6, Locust, Gatling) & high-concurrency scalability programmer. I am Aldian Fazrihady, a Senior Freelance Full Stack Developer and Performance Engineer.
Core Load Testing, Bottleneck Profiling & Remediation Capabilities
- Realistic Multi-Scenario Load Scripts (Grafana k6 & Python Locust): Simulating 10,000 to 100,000+ concurrent virtual users across authenticated REST/GraphQL APIs, WebSockets, and streaming AI endpoints.
- Flamegraph CPU/Memory Profiling (`py-spy`, `pprof`, Chrome DevTools): Pinpointing the exact line of Python, Go, Node.js, or SQL code causing p99 latency spikes under load—and fixing it directly in your codebase.
- Auto-Scaling & Connection Pool Calibration: Tuning Kubernetes HPA / Cloud Run concurrency limits, Gunicorn/Uvicorn worker counts, PgBouncer pools, and Redis caches.
Frequently Asked Questions
Do you just hand over a load test report, or do you actually fix the bottlenecks you find?
Both! Unlike QA-only testers, I am a senior full-stack and backend systems programmer—so after identifying database locks or slow endpoints with k6/Locust, I write the code/index optimizations and re-run the benchmark to prove the 10x throughput gain.
How do I hire you for load testing and scalability engineering?
Hire me via Upwork.