Interactive e-commerce playground

Save the checkout.

Black Friday is getting busy. Watch the system, try the right upgrades, and keep checkout flowing without overspending.

68-second challenge€760/h change budgetLive system model

How to play

01
Watch the numbersFollow load, latency and checkout success.
02
Try a smart upgradeYour budget will not cover everything.
03
Keep it smoothYour result rewards balance, not clicks.

Round 01 · Traffic spikeTraffic warm-up

Elapsed00:00

Remaining01:08

System stability98%

Incoming traffic

520 RPS

485 shopper RPS

p95 latency

157ms

Target: under 800ms

Checkout errors

0.82%

99.18% success rate

Orders processed

43.6 orders / sec

Revenue protected

€0

€0 missed revenue

Live topology

Commerce request path

smoothbusycheck this

Traffic warm-up

Traffic is rising fast, but every dependency is still responding.

00:00

Smooth

Edge CDN

6% bot share

Utilization9%

Smooth

Load balancer

520 RPS routed

Utilization11%

Smooth

PHP fleet

2 application nodes

Utilization44%

Smooth

MySQL primary

Orders · inventory · customers

Utilization41%

Smooth

Payments

99.5% provider availability

Utilization18%

Not added

Redis

Hot-path cache available

Standby option—

Not added

RabbitMQ

Async work available

Standby option—

Not added

Read replica

Replica not promoted

Standby option—

p95 response trend157ms

stableerrors

0ms2.2s+

What changed

Play-by-play

1 events

00:00

Playground ready

You have €760/hour and 68 seconds to keep checkout flowing.

Built, modelled & tuned by Vitalii Fito

Playful on the surface. Serious engineering underneath.

Capacity planning, caching, async workloads, database pressure, dependency isolation and commercial trade-offs — packed into one quick Black Friday challenge.

Let's talk commerce architecture