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Decoupling checkout

One idea per slide — why and how we moved order notifications to events.

Why now
01 · Drivers

Checkout was slow and brittle — three forces pushed us to act.

SECTION 01 · Drivers
Slow checkout
p95 hit 2.4s — three inline calls.
PAIN
Fails together
One downstream down failed the order.
RISK
Blocked squads
Every change shipped through us.
DRAG
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Why now
02 · Slide
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The numbers
03 · Metrics
SECTION 02 · Metrics
2.4s
Checkout p95 before
▼ +1.6s
800ms
Target after
3
Consumers decoupled
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The shape of the fix
04 · Pyramid
SECTION 03 · Pyramid
PyramidPublish OrderPlacedCheckout returns the moment the event is outSubscribe independentlyEach consumer reacts on its ownReplay on failureThe bus is the recovery log
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Where to invest
05 · Matrix
SECTION 04 · Matrix
2×2
QuadrantEffort →↑ ImpactLowHighHighLowEvent bus + DLQBilling consumerSelf-serve consoleDashboards
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The plan
06 · Roadmap
SECTION 05 · Roadmap
Q1
Q1 — Bus live
Q2
Q2 — Fan-out
Q3
Q3 — Self-serve
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