Coding interview preparation

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Updated: May 26, 2026 at 11:01 AM

Coding interview preparation

Coding interview preparation for software engineers Daily interview questions, algorithms, data structures & clean solutions. Real interview tasks and problems. Join 👉 https://rebrand.ly/bigdatachannels DMCA: @disclosure_bds Contact: @mldatascientist

Follow @coding_interview_preparation to stay updated with the latest algorithms and interview trends and news

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Coding interview preparation

Mar 18, 2026, 11:48 AM

The Clarification You Forgot to Ask

🗯 Scenario: Halfway through coding, the interviewer says,
What about negative numbers?
Your solution breaks. You knew you should have asked more questions.

👉Do this: Before writing code, lock in the habit of asking at least three clarifying questions. Confirm input ranges, data types, and whether duplicates or negatives are possible. Technically, this protects you from hidden constraints that often change the entire approach. Strong candidates reduce surprises early.

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Coding interview preparation

Mar 18, 2026, 11:48 AM

❔Interviewer:
What is the difference between REST and RPC?

✅ Answer:

REST is an architectural style that models interactions around resources using standard HTTP methods such as GET, POST, PUT, and DELETE. It emphasizes stateless communication and resource oriented design.

RPC, or Remote Procedure Call, focuses on invoking actions or functions on a remote server as if they were local calls. It is typically more operation focused rather than resource focused.

REST is generally preferred for public web APIs due to its simplicity and cache friendliness, while RPC based approaches like gRPC are often used in internal microservices where performance and strong contracts are more important.

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Coding interview preparation

Mar 18, 2026, 11:48 AM

❔Interviewer:
How does database indexing improve performance?

✅ Answer:

Database indexing improves performance by creating a data structure, typically a B-tree or hash based structure, that allows the database engine to locate rows quickly without scanning the entire table.

Without an index, queries often require full table scans, which are O(n). With a proper index, lookups can be reduced to O(log n) or even O(1) depending on the index type.

However, indexes come with trade offs. They consume additional storage and can slow down write operations because the index must be updated whenever the data changes. Therefore, indexes should be added selectively based on query patterns.

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Coding interview preparation

Mar 18, 2026, 11:48 AM

📷 Photo

AI vs Machine Learning vs Deep Learning vs Generative AI

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Coding interview preparation

Mar 18, 2026, 11:48 AM

❔Interviewer:
How do you prioritize tasks when everything seems urgent?

✅ Answer:

When multiple tasks are urgent, I first evaluate impact and urgency separately. I prioritize work that affects customers or production stability the most.

I also communicate early with stakeholders to align expectations and avoid silent trade offs. If necessary, I break work into smaller deliverables to show progress quickly.

This structured prioritization helps ensure that the most critical issues are addressed first while maintaining transparency with the team.

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Coding interview preparation

Mar 18, 2026, 11:48 AM

The Final Question Trap

🗯 Scenario: The interviewer smiles and says,
Do you have any questions for us?

👉 Do this: Always have one thoughtful question ready. Ask about the team’s biggest technical challenge or what success looks like in the first six months. Sharp questions make you memorable long after the coding part ends.

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Coding interview preparation

Mar 18, 2026, 11:48 AM

[poll]

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Coding interview preparation

Mar 18, 2026, 11:48 AM

The Memory Usage Question

🗯 Scenario: After solving the problem, the interviewer asks about space complexity and you did not track it.

👉 Do this: Always mention both time and space when presenting a solution. Count auxiliary data structures and recursion stack if present. Technically, many candidates forget that recursion adds implicit space. Calling this out makes you look much more thorough.

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Coding interview preparation

Mar 18, 2026, 11:48 AM

💻 Coding Interview Questions

1️⃣ What is a pointer?
Answer: A variable that stores the memory address of another variable.

2️⃣ What is memory allocation?
Answer: The process of reserving memory for program execution.

3️⃣ Stack vs Heap memory?
Answer: Stack is fast and automatic; heap is dynamic and manually managed.

4️⃣ What is garbage collection?
Answer: Automatic memory cleanup of unused objects.

5️⃣ What is a deadlock?
Answer: When processes wait forever for resources held by each other.

6️⃣ What is multithreading?
Answer: Running multiple threads concurrently within a process.

7️⃣ What is synchronization?
Answer: Controlling access to shared resources in concurrent programs.

8️⃣ What is a race condition?
Answer: When multiple threads access shared data unsafely.

9️⃣ What is a process?
Answer: An independent program in execution.

🔟 What is a thread?
Answer: The smallest unit of execution within a process.

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Coding interview preparation

Mar 18, 2026, 11:48 AM

❔Interviewer:
Explain the difference between horizontal and vertical scaling.

✅ Answer:

Vertical scaling means increasing the resources of a single machine, such as adding more CPU or memory. It is simpler to implement but has hardware limits and can become a single point of failure.

Horizontal scaling means adding more machines and distributing the load across them. It provides better fault tolerance and scalability but introduces additional complexity such as load balancing, data consistency, and distributed coordination.

Modern high scale systems typically favor horizontal scaling because it supports elastic growth and higher availability.

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Coding interview preparation

Mar 16, 2026, 11:29 AM

[poll]

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Coding interview preparation

Mar 16, 2026, 11:29 AM

The “I’ve Never Seen This Before” Moment

🗯Scenario: The interviewer finishes explaining the problem and you realize you have never practiced anything like it.

👉 Do this: Shift into discovery mode. Ask about constraints, input size, and edge cases. Then propose a naive solution first and improve it. This shows structured thinking and calm problem solving, which often scores higher than instantly jumping to an optimal answer.

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