Vlad Patryshev Interview
summary
A production system on AWS processes incoming data as streams and requires layered aggregations per minute, hour, week and year, forcing a choice between store raw events and scan later or maintain pre-aggregates to answer queries like five-year Black Friday averages; a previous deployment of about 500 scraping services runs for four years with zero null pointer exceptions by using functional programming, making code prepared for anything so small teams can manage large-scale behavior.
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