Harnham Interview Questions

Written by IQ Team

Reviewed by Jay Feng

Published March 27, 2026

Estimated reading time: 5 minutes

data and analytics recruitment is our core business and we’re proud to say, our customers believe we’re good at it. in our most recent customer satisfaction survey, 95% of respondents said that they would recommend harnham. harnham has actively chosen to focus on data and analytics, we’ve immersed ourselves in this market and are now an integral part of this business community. our capability has grown to provide recruitment services and advice across the marketing analytics, credit risk, data science, data and technology and digital sectors.

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Practice for the Harnham interview with these recently asked interview questions.

Question Topic Difficulty

2nd Highest Salary

SQL

Easy

Write a SQL query to select the 2nd highest salary in the engineering department.

Note: If more than one person shares the highest salary, the query should select the next highest salary.

Example:

Input:

employees table

Column	Type
`id`	INTEGER
`first_name`	VARCHAR
`last_name`	VARCHAR
`salary`	INTEGER
`department_id`	INTEGER

departments table

Column	Type
`id`	INTEGER
`name`	VARCHAR

Output:

Column	Type
`salary`	INTEGER

View Question

Show Solution

Top Three Salaries

SQL

Medium

Rolling Bank Transactions

SQL

Hard

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Calculate Moving Average	SQL	Easy
Predict Customer Churn	Machine Learning	Medium
A/B Test Significance	Statistics	Medium
Optimize Query Performance	SQL	Hard
Feature Importance Analysis	Machine Learning	Medium
Clean Missing Data	Python	Easy
Neural Network Architecture	Deep Learning	Hard
Calculate Cohort Retention	SQL	Medium
Bayesian Probability	Statistics	Easy
Recommend Similar Products	Machine Learning	Hard