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System	Design	Flow	
	
1.	Understand	the	problem	and	scope:	
				-	define	the	use	cases,	with	interviewer's	help	
				-	suggest	additional	features	
				-	remove	items	that	interviewer	deems	out	of	scope	
				-	assume	high	availability	is	required,	add	as	a	use	case	
2.	Think	about	constraints:	
				-	ask	how	many	requests	per	month	
				-	ask	how	many	requests	per	second	(they	may	volunteer	it	or	
make	you	do	the	math)	
				-	estimate	reads	vs.	writes	percentage	
				-	keep	80/20	rule	in	mind	when	estimating	
				-	how	much	data	written	per	second	
				-	total	storage	required	over	5	years	
				-	how	much	data	read	per	second	
3.	Abstract	design:	
				-	layers	(service,	data,	caching)	
				-	infrastructure:	load	balancing,	messaging	
				-	rough	overview	of	any	key	algorithm	that	drives	the	service	
				-	consider	bottlenecks	and	determine	solutions

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