Few hints about coding interview The story “Could you please help to solve this coding problem?”, I shared my screen. We started with a simple binary search problem. “Sure let me take a look”. he answered. After 5 mins. “I want to sort the array and then do a binary search, so…

From a Dota gamer’s perspective A monthly 1:1 “What did you do over last weekend?” I asked a developer in my team. “Play game,” he said. “What kind of game” I asked. “switch, some RPG, or Dota,” he said. “I am an old gamer, I played Dota too,” I said. “do you find…

A conversation with my scrum master friend The convernsation “Scrum has too many processes, most of them seem useless,” my friend told me, who was a lead and scrum master in a team. “Do you mean the stand-up meetings, sprint review and planning and retro?” I asked. “Yes, no one cares what…

The Interview story Last week. senior backend position. “Here you mentioned that lead and scaled database from a single node to cluster, archived better performance, could you please elaborate more?” I asked. “Sure. I was the lead of this project. We migrated our single node database to the master-master setup database. so we…

Let’s explore every aspect where the concept of an event loop excels in this one single post. The story “During yesterday’s interview, my interviewer asked me which web server I am using, I told him Apache, PHP” my friend told me. “Then what he said?” I asked him. “He said that was…

When I see “I boost system performance X times faster by using Y cache” Cache is hard There are only two hard things in Computer Science: cache invalidation and naming things. - Phil Karlton When we work with cache, it brings performance, but it also brings problems. …

Explained in 15 mins, all of them. Begin When talking about database transactions, I often see developers(including myself) confused with the below locks: S(shared) lock, X(exclusive) lock Pessimistic lock, Optimistic lock table lock, row lock, page lock, record lock, gap lock, next-key lock And these Isolation levels: Read uncommitted, Read Committed…

2 Intuitive ways to prove.

Are they the same? Today I talked with a friend who has a math degree. and we talked about something in common in both programming and mathematics — function. Which was a very interesting discussion. Are they the same? Yes and no. First, let's talk about programming. after a decade of programming with 5+…