Yeeeeah instagram realized in 1-2 years I am done, and will need a switch. I clicked, no jokes

Daily (281/373 streak until LC cap)

Amazing problem, pretty easy to solve, and has well known pattern.

https://leetcode.com/problems/jump-game-iii/description/?envType=daily-question&envId=2026-05-17

#daily #medium #pattern

Daily (282/373 streak until LC cap)

Nice problem, it is not that hard, except one peculiarity that you need to do. It is good and has well-known pattern. Definitely recommend.

https://leetcode.com/problems/jump-game-iv/description/?envType=daily-question&envId=2026-05-18

#daily #hard #pattern

Yesterday’s dinner. Maybe you have already seen this guy, but I definitely recommend watching.

Atlassian laid off dev is showing system design of their infra. Pretty good system design btw. A lot of similar stuff we are doing at Snow rn.

Folks, do you see the last message with link?

Checking comments…

TELEGRAM WHAT THE FUCK


Are you doing A/B behind my back

This is the most interesting thing from the system design perspective

messages are sent in this order:

message1
message2
message3

===

Some people saw:
message1
message3

It tells a lot about their guarantees and potential implementation (at least gives an idea)

===

Leave your thoughts what could happen!

Daily (283/373 streak until LC cap)

Easy problem, with pattern that is needed in merge sort actually. Pretty good.

https://leetcode.com/problems/minimum-common-value/description/?envType=daily-question&envId=2026-05-19

#daily #easy #pattern

Кожного понеділка

I am helping people to prep for FAANG interviews, and some guy have found this legendary old meme

Lets recall the background

Evntually exclusive content😁😁😁

Daily (284/373 streak until LC cap)

Easy problem to be honest, both bruteforce and optimal solutions would pass. Go and collect the coin. Overall the problem is not a bullshit, so deserves my recommendation.

https://leetcode.com/problems/find-the-prefix-common-array-of-two-arrays/?envType=daily-question&envId=2026-05-20

#daily #medium #pattern

Daily (285/373 streak until LC cap)

Nice problem, has bunch of patterns, one of the leetcode pattern in this problem happened to me during my interview to one of the big tech companies. Definitely recommend recalling.

https://leetcode.com/problems/find-the-length-of-the-longest-common-prefix/description/?envType=daily-question&envId=2026-05-21

#daily #medium #recommend #pattern

Now working together with ex-Principal from Google on some tight deadline project. Most stuff is in Rust. First time I saw rust code was 5 days ago...

I don't know it looks very ugly and unpleasant to me. The paradigm is nice, but I don't know, as the guy who has php => c/c++ => c# => javascript/python background, it feels very ugly. I would rather work with c/c++.

(meme authored by me after reviewing 12th PR a day submitted by Google's principal)

Daily (286/373 streak until LC cap)

Again top 100 first LeetCode questions. If you are into leetcode - it should be already solved by you. Not bad binary search problem, a bit annoying.

https://leetcode.com/problems/search-in-rotated-sorted-array/description/?envType=daily-question&envId=2026-05-22

#daily #medium #pattern

Here we go. If you hire too strong and clever people (ex-Google staffs) -> this happens. I'm trying to understand things over design docs + ai to start doing at least something. But it is so complicated and I'm missing so much background. The senior folks are just spamming PRs. Only after one week I can at least have an idea what some PRs are doing.

Right now, I'm fully stuck with certificates/cryptography as owned CA and bunch of some crypto algos are used.

So, for now I'm going to cover a bit of cryptography background: TLS/mTLS, bunch of algos worked on symmetric keys, how they are derived etc.

Will post here, maybe somebody will find it useful.

Question for now. Do you know how client validates TLS certificate presented by browser? and why self signed certificate won't be trusted? I mean, can you explain with tech details.