Python · high-load · RPS · distributed systems · fault tolerance
I help product teams raise RPS and harden production — hot code paths, CPU, RAM / memory leaks, queues, retry storms, and failure modes across services — so critical paths stay fast and stay up.
Hands-on: profiles & traces → business-ranked backlog → change the code → fault-tolerance + monitoring so load and failures don’t take you down again.
| Site | sapezhko.com |
| Book | Free 30-min diagnostic |
| roman@sapezhko.com | |
| linkedin.com/in/application-performance-consultant-technical-advisor | |
| Based | Cheyenne, Wyoming, United States · Remote |
| Open to | High-load audits · fix & harden · Python backends under real traffic |
Performance Engineer · high-load · RPS · distributed systems · fault tolerance · circuit breaker · backpressure · Python backend performance · Django / FastAPI · CPU profiling · memory leak · Postgres / Redis / Celery · throughput · p95 · observability · production reliability
| Metric | Before → After | Context |
|---|---|---|
| API load | — → 500+ RPS | High-load B2B platform |
| API uptime | under load → 99.9% | Reliability bar held |
| Throughput | baseline → +35% | Same platform |
| Message delivery | at risk → 99.9% | 24/7 IoT · 2,500+/min |
| Origin TTFB | ~2.6s → ~350ms | Storefront delivery / caching |
Landing with offer, cases, and sample diagnostic: sapezhko.com · source: performance-engineer
- Find what’s slow — or fragile — CPU, RAM, RPS ceilings, queues, retries (profiles & production signals)
- Prioritize by business impact — conversion, reliability, infra cost
- Fix and harden — change code/runtime + fault-tolerance guardrails so regressions and cascades don’t return
Backend: Python, Django, FastAPI, Postgres, Redis, Celery, asyncio
Systems: load paths, queues, backpressure, circuit breakers, delivery guarantees
Runtime: profiling, memory analysis, load testing, observability
Delivery: nginx, Docker, CI/CD, performance budgets
- 🌐 sapezhko.com — Performance Engineer consulting (diagnostic → audit → fix & harden)
- 📦 performance-engineer — Astro landing source
Building in public around high-load performance and reliability for SaaS and e-commerce.
If APIs or distributed paths hit RPS ceilings or cascade under failure — book a free 30-minute diagnostic.




