02. arjen de ruiter, bol.com

The value of dataPerformance & scalability

challenges @bol.com

@arjenderuiterSlides with input from Niels Basjes & Edith Kanters

Topics• Value of data• Scalability &

performance• Tips

Value: customers find what they are

looking for with search rank

Value: inspire customers with

product recommendations

Value: a personal shop full of

inspiration for every customer

Value: provide us with explicit

feedback on your personal shop

7

Everything data

CUSTOMER

Right frequency

Right Event

Right content

Right place

Right promotion

Right timing

Sprints

Stor

ies

V

alue

ValueStory points/scopeRELEASE

As stories burn down, value increases

15 million products: not Big Data

15 million clicks a day: not Big Data

>3.5TB + >20TB> 10.000.000.000 product combinations: getting bigger!

It does not fit anymore

It takes too long

16

Scalable processing: it al starts

small

17

18

19

20

Big enough and cost effective?

21

<schaalbaarheid>

Economic size

Different models

26

Linear horizontal scalability:

start small, end big

MTBHIAGSD

Value

MTB

HIA

GSD

@andrianco, Netflix

Mean Time Between Having

An Idea And Getting Stuff Done

So deliver fast!

Launch early & iterate

One of the company rules of thumb at Google is: if you are not embarrassed by your first launch, you have not launched early enough

Trim the tail, don’t spend time on low value features

Value

Tim

e

Epic 3

Epic 2

Epic 1

Tail … does not add too much additional value

Measure & act. Fail fast, fail cheap.

A/B testing to find the best variant of a solution

Our main Big Data conclusion