Thanks https://t.me/interview_runner ❤️


Checked channel. The guy is sharing a lot of interview related things, leetcode, and more practical stuff.

So you all might be interested.

Some time ago we had even System Design mock with Vlad.

We were designing either my Presence in teams or Messenger if I am not mistaken. Was it offer from AWS after that or no, Vlad?

And I guess the initial connection was through our legend: Vlad Ten.

What a small world.

Vlad 1010❤️

Alright, 150 + people, I will need to do some content nearest days prob.

So TLS/SSL custom PKI + cryptography (practical, needed for work) is going to be out soon (article first)

There are stuff I learned while working with ex Google director, have quite a lot to share with you

It is exactly the same feeling as it was with networking. Before Snow and bunch of Staff exGooglers I thought I know tcp/ip, now I realized I didnt know shit.

Daily (300/373 streak until LC cap)

A bit nonsense q, first time I see this kind of "number" dp. Wasn't able to solve on my own.

https://leetcode.com/problems/total-waviness-of-numbers-in-range-ii/submissions/2022794973/?envType=daily-question&envId=2026-06-05

#daily #hard #pattern

So addressing one of the comments, in a fully covered way

Daily (301/373 streak until LC cap)

Easy q, problem for refreshing preffix/suffix pattern pretty much. Definitely recommended as it is used heavily in other problems

https://leetcode.com/problems/left-and-right-sum-differences/description/?envType=daily-question&envId=2026-06-06

#daily #easy #pattern

WHY DO YOU GO TO OFFICE ON SATURDAY?!?!?!??

Me: «давай на ц»

Small introduction for new 200 people.

So, I'm Andrii, next month will be 8 years since I started making money out of software engineering.

I'm originally from Ukraine and started my path as a Junior .NET developer at a small outsource company in 2018. I was very lucky and got an extremely good techlead that suggested me a bunch of books and direction for development. Since then every year (and a half) I was switching these outsource companies on the next level (fake levels). In 2020 got a fake Senior offer from Epam, and since then decided to try big tech.

Failed my first interview for AWS, but succeeded Microsoft's one, and relocated to Prague. At MS I got a pretty bad project initially (Dynamics 365) and after one year passed the interview to Teams' Presence service (green/yellow/red indicator of your status: in a meeting, in a call, etc.). It was the best project in my whole life so far, high load (over 1M req/s), custom replication, custom sharding, global rollout with the best practices, etc.

But I got a bad visa (temporary protection) therefore decided to pursue another opportunity in an English-speaking country, since a Senior promotion at MS wouldn't matter moneywise that much for me, and on-hire stocks were almost over.
Prepped for 3 months, and landed Snowflake and Google offers, but decided to move forward with Snowflake.

And here we are, already half a year I'm here in Dublin, let's see how it goes.

I guess you have already checked the content. Main focus is on Leetcode as it is still widely asked in interviews, and I'm paranoid about layoffs. Besides that I'm doing System Design that I'm genuinely enjoying. As part time I'm helping people to prep for big tech companies and doing mock interviews. Apart from it, sometimes I'm doing some small articles/content about work-related stuff: PG race conditions, TLS deep dives, OAuth deep dives, etc. Some time ago I was also streaming the Leetcode/System design, but not anymore. I will start once I'm prepping for Google next time.
From time to time you might see some misc content related to music or boxing, as this is what I do when I'm not busy with programming.

I love pets, and there is Mr Orange that I am feeding daily. You are gonna see him frequently.

Daily (302/373 streak until LC cap)

Pretty simple one tbh, I was even not sure my approach is the right one (check thecomments)

https://leetcode.com/problems/create-binary-tree-from-descriptions/description/?envType=daily-question&envId=2026-06-07

#daily #medium #nopattern

Cooking, want to give a bit of math background.

Yes, turns out, for the Nth time, math is needed if you are doing something more complicated than crud on backend