Yandex Frontend Interview. Senior+ 5YOE (No hire)

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yandex
Senior+5 years
July 3, 20253 reads

Summary

I interviewed for a Senior+ Frontend role at Yandex with 5 years of experience. I was not hired primarily due to a lack of knowledge in CI/CD, deployment processes, and backend concepts, despite performing well on various technical and algorithmic challenges.

Full Experience

Platform, Algorightms:

  1. Implement Array.groupby
  2. Given 2 arrays of intervals find their intersections
  3. Implement Promise.all, Promise.any
  4. Implement lodash.debounce (something similar)
  5. Implement lodash.get
  6. Does string s exist in subsequence of k
  7. Simple hashmap. Messages apear in non consecutive order (let's assume via websockets). We need to log them consecutevly when they appear. Eg messages appear like so 1,3,2,4. First we log 1. Then remember 3. Then log 2 and 3 when we get 2. Then log 4.

Finals:

  1. Why we use SSR?
  2. CI\CD. Have you ever worked with?
  3. Testing. Why we use it? What types of testing did you use?
  4. Cases with optimizing your codebase?
  5. Hardest project\task you ever worked with. How did you deal with that?

Vertict: No hire.

Reason: Don't know CI\CD, Deploy, and backend

Interview Questions (12)

Q1
Implement Array.groupby
Data Structures & Algorithms

Implement the Array.groupby method.

Q2
Find Intersections of Two Interval Arrays
Data Structures & AlgorithmsMedium

Given 2 arrays of intervals, find their intersections.

Q3
Implement Promise.all and Promise.any
Data Structures & AlgorithmsMedium

Implement JavaScript's Promise.all and Promise.any methods.

Q4
Implement lodash.debounce
Data Structures & AlgorithmsMedium

Implement a debounce function similar to lodash.debounce.

Q5
Implement lodash.get
Data Structures & AlgorithmsEasy

Implement a function similar to lodash.get for safely accessing nested object properties.

Q6
Check if String S is a Subsequence of K
Data Structures & AlgorithmsEasy

Given two strings, s and k, determine if s exists as a subsequence of k.

Q7
Log Consecutive Messages from Out-of-Order Stream
Data Structures & AlgorithmsMedium

Implement a system to log messages consecutively, even if they appear in a non-consecutive order (e.g., via websockets). For example, if messages appear as 1,3,2,4: First, log 1. Then, remember 3. When 2 arrives, log 2 and then 3. Finally, log 4.

Q8
Why use Server-Side Rendering (SSR)?
System Design

Explain the reasons and benefits of using Server-Side Rendering (SSR).

Q9
Experience with CI/CD
System Design

Discuss your experience with Continuous Integration and Continuous Deployment (CI/CD).

Q10
Importance and Types of Testing
System Design

Explain why testing is important and describe the types of testing you have experience with.

Q11
Codebase Optimization Strategies
System Design

Describe scenarios where you optimized a codebase and the approaches you took.

Q12
Hardest Project/Task and Resolution
Behavioral

Describe the hardest project or task you've worked on and how you approached and resolved it.

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