Coding Interview Preparation
@coding_interview_preparation - Channel Telegram
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13/07/26
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About Coding Interview Preparation
Coding Interview Preparation is a Telegram channel dedicated to Technology, with over 5k subscribers. Coding interview preparation for software engineers Interview questions, DSA, clean solutions. Join 👉 https://rebrand.ly/bigdatachannels Buy ads: https://telega.io/c/coding_interview_preparation D... Join the channel to receive all updates directly on Telegram.
Original description
Coding interview preparation for software engineers Interview questions, DSA, clean solutions. Join 👉 https://rebrand.ly/bigdatachannels Buy ads: https://telega.io/c/coding_interview_preparation DMCA: @disclosure_bds Contact: @mldatascientist
Recent messages
📊
SQL SATURDAY #3 - GROUP BY and Aggregates
orders
+----+-------------+--------+------------+
| id | customer_id | amount | order_date |
+----+-------------+--------+------------+
| 1 | 1 | 250 | 2024-01-05 |
| 2 | 1 | 100 | 2024-02-14 |
| 3 | 2 | 75 | 2024-01-20 |
| 4 | 3 | 500 | 2024-03-01 |
| 5 | 2 | 200 | 2024-03-15 |
Quest
📄
RESUME ROAST #2
Real-style bullet incoming:
> "Familiar with Python, Java, C++, JavaScript, React, Angular, Vue, Node.js, Docker, Kubernetes, AWS, Azure, GCP, MongoDB, PostgreSQL, Redis, Kafka, GraphQL"
What's wrong here?
👇
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.
.
The roast:
This is the "keyword salad" resume. It signals one of two things to an experienced hiring manager: either you're exaggerating your depth in most of these, or
Sorting Algortihm Comparison
🏗️
SYSTEM DESIGN MONDAY #3 - Load Balancing & Horizontal Scaling
One server is now overwhelmed. Two options: make it bigger (vertical scaling) or add more of them (horizontal scaling). Horizontal scaling is what most large systems actually do - there's a ceiling on how big one machine can get, but no real ceiling on how many machines you can add.
┌─────────┐
┌─────
▶
│ Server 1│
│ └─────────┘
💰
SALARY NEGOTIATION #2 - Handling "What's Your Current Salary?"
This question puts a lot of candidates on the spot - and in many US states, it's actually illegal for employers to ask. But it still comes up, especially in phone screens or in regions where it's legal.
The problem with answering directly:
it anchors your new offer to your old salary, especially if you were underpaid before.
✅
A scri
🧠
EDUCATIONAL CS #3 - Recursion Without the Headache
Recursion clicks once you stop thinking about "the whole problem" and start thinking about these two things:
1️⃣
Base case
- the simplest version of the problem you can answer directly, no further recursion needed.
2️⃣
Recursive case
- how to break the problem into a smaller version of itself, plus some work.
python
def factorial(n):
if n == 0:
🐛
SPOT THE BUG #3
Language: Python
python
def binary_search(arr, target):
left, right = 0, len(arr)
while left < right:
mid = (left + right) // 2
if arr[mid] == target:
return mid
elif arr[mid] < target:
left = mid
else:
right = mid
return -1
Subtle one. Spot it before scrolling
👇
.
.
.
The bug:
Infinite loop risk. When
arr[mid] < target
, the code sets
left = mid
instead of
left = mid + 1
. If
mi
💰
SALARY NEGOTIATION #3 - Comparing Multiple Offers
Having multiple offers is the single strongest negotiation position you can be in - but a surprising number of people mishandle it by staying quiet about it.
✅
The script, once you have a competing offer:
"I wanted to be transparent with you - I've received another offer at $X with [notable perk, e.g., more equity / remote flexibility]. I'm genui
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