Designfirst Homes Interview Questions and Answers

Use dynamic programming to find the longest palindromic substring.

• Start by creating a 2D array to store if substrings are palindromic.

• Iterate through the string and fill the array based on palindromic conditions.

• Track the longest palindromic substring found.

• Example: Input 'babad', Output 'aba' or 'bab'.

AWS design problems are common in cloud computing. They require careful planning and implementation.

• Identify the problem and its root cause

• Consider scalability and availability

• Choose the appropriate AWS service

• Implement fault tolerance and disaster recovery

• Monitor and optimize performance

The best bug I identified was a critical security vulnerability in the login system that could potentially expose sensitive user data.

• Identified a critical security vulnerability in the login system

• Potential exposure of sensitive user data

• Promptly reported and fixed the issue to prevent any data breaches

High Availability refers to the ability of a system to remain operational and accessible for a high percentage of time.

• Ensures minimal downtime by providing redundancy and failover mechanisms

• Involves clustering, replication, and load balancing to distribute workload

• Common technologies used for achieving high availability include Always On Availability Groups in SQL Server

AlwaysOn is a high availability and disaster recovery feature in SQL Server that provides redundancy and failover capabilities.

• AlwaysOn Availability Groups allow you to create a group of user databases that fail over together

• AlwaysOn Failover Cluster Instances provide high availability for a single SQL Server instance

• Automatic failover and read-only secondary replicas are key features of AlwaysOn

Clustering is the process of grouping together similar data points based on certain criteria.

• Clustering helps in organizing data into meaningful groups for analysis.

• It is commonly used in data mining and machine learning.

• Examples include K-means clustering and hierarchical clustering.