ask good questions (what featues to work on, how much to scale)
dont use buzzwords
clear and organized thinking
drive the discussion (80 - 20)


features
define APIs
availability
latency performance
scalability
durability
class diagram
security & privacy
cost effective


vertical vs horizontal scaling
cap theorem
acid vs base
partitioning/sharding data
constistent hashing
optimisting vs pesimisting locking
strong vs eventual consistency
relational vs nosql
types of nosql (key value, wide column, document based, graph based)
caching
data center/ racks/ hosts
cpu/ memory/ hard drive/ network bandwidth
random vs sequential read/write on disk
http vs http2 vs websockets
tcp/ip model
ipv4 vs ipv6
tcp vs udp
dns lookup
https & tls
public key infractructure & certificate authority
symmetric vs asymmetric key
load balancer -> l4 vs l7
CDNs & Edge
bloom filters & count-min sketch
paxos-consensus over distributed hosts (leader election)
design patterns & object oriented design
virtual machines & containers
publisher-subscriber or queue
map reduce
multi theading, concurrency, locks, syhcronisation, CAS


cassandra
mongodb/ couchbase
mysql
memcached
redis

zookeeper
kafka

nginx
HAProxy

solr, elastic search

blobstore like Amazon S3

docker (kubernetes, mesos)

hadoop/spark (hdfs)


https://martinfowler.com/articles/mocksArentStubs.html

https://plumbr.io/handbook/what-is-garbage-collection

class loader

thread pool (https://stackify.com/java-thread-pools/)



stream - czy moze byc zrownolegalny, jak

model pamieciowy javy - heap vs stack, z czego sklada sie heap
https://stackoverflow.com/questions/1262328/how-is-the-java-memory-pool-divided


Java 		Java 8, Spring Framework, Hibernate, Spring Boot
Javascript 	Javascript (I have also basic knowledge about Angular, React and NodeJS)
Programming 	Unit testing, OOP, TDD, Clean Code, Acceptance Testing
Databases 	Oracle, Postgres
Other 		Linux, Git, Python, Docker, Bash, Jenkins, IntelliJ Idea, REST