Callify interview experience Real time questions & tips from candidates to crack your interview
SDE - 1
Callify
3 rounds | 3 Coding
problems
Selected Interview preparation journey
Preparation
Duration: 3 months
Topics: I had prepared for micro-services development framework i.e flask for the initial screening test and then I brushed up topics like API's , AWS , SQL and NOSQL databases.
Tip 1 : Practice full stack file upload type questions on hackerearth.com.
Tip 2 : Study one out of these framework whichever you feel comfortable in like django/flask/fast-api. django and fast-api preferable.
Tip 3 : Should know one database technology like SQL , NOSQL. You are expected to store and retrieve data from the database. You should also know hosting techniques using cloud based services.
Application process
Where: Hackerearth
Eligibility: Clear all subjects. That's it.
Tip 1 : keep it minimalistic no fancy designs are required. Try to keep everything in one page
Tip 2 : Focus on links to GitHub, your contributions , open source projects , past relevant experiences with short summary
Interview rounds
01
Round
Hard
Online Coding Interview
Duration360 Minutes
Interview date10 Mar 2022
Coding problem1
It was a online round for 6 hrs duration conducted online on hackerearth platform. You can take the test anytime anywhere.
1. System Design Question
We were given a file upload type question where on hackerearth where we were expected to design and host 4 API Endpoints for some data given to us.
We needed to store data using some cloud tech and then were asked to build and host these micro-services
Problem approach
Tip 1: Go through flask framework for micro services development
Tip 2: study how to write queries for CRUD operations on a database tables
Tip 3: Deployment of code using cloud based services like heroku , AWS , GCP etc
02
Round
Medium
Video Call
Duration45 Minutes
Interview date15 Jun 2022
Coding problem1
This was a video call round with the CTO of the company.
We started by discussion on the problem statement given in the screening test then was interviewed based on my past experiences
1. System Design Question
I was asked about to describe how basic authentication works and how did I implement it in my previous organization.
I was also asked about AWS services like lambda , dynamodb , userpools
Problem approach
Tip 1: Study about request response , http /https , headers , tokens validation , cookies etc
Tip 2: practice git basics
Tip 3: practice and develop micro-services for a login/signup page. It will give you an idea about how things function.
03
Round
Easy
HR Round
Duration15 Minutes
Interview date20 Jun 2022
Coding problem1
Was called by founder of the company around 9:00 pm over a telephonic discussion to discuss about joining and other formalities
1. Basic HR questions
About myself
About notice period
Salary negotiations
Problem approach
Tip 1 : Just be confident
Tip 2 : know your worth
Tip 3 : Ask relevant questions
Here's your problem of the day 
Solving this problem will increase your chance to get selected in this company
Skill covered: Programming
How do you remove whitespace from the start of a string?
Choose another skill to practice
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