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System Design

• load balancing
  • DNS / Round Robin / hashing IP address / figuring out which machines are offline
• cacheing
  • memcached / Redis
• CDNs for cacheing static assets and global fast delivery, e.g. Cloudfront
  • length of time to expire
  • version names
  • invalidations

• Python

• Database:
  • master / slave replication
  • sharding
    • vertical(users / tweets / support)
    • horizont1al: same stuff, multiple shards
• asset server like S3 or cache with CDN
• API
• Security

depends on the loads and parameters? Keep it simple!

What is a problem that you've faced and how did you solve it?

Figure out this question before any interview. Choose a question that reflects the size of the role you're applying to.