DataLemur: $1.5K a month, self-reported in 2023, for interview practice

DataLemur is an interactive interview-practice platform for people preparing for technical data roles. Its $1.5K a month was founder-reported on the Indie Hackers product page (not independently verified), as of September 2023.

What it actually sells

DataLemur is an interactive SQL and Analytics interview platform for the data community. Its practice covers SQL interview questions with multiple hints and full solutions, plus data science questions spanning Statistics, Probability, and Machine Learning.

The site also lists one-hour coaching covering resumes, LinkedIn, job-hunting tactics, and mock interviews. A signed paperback copy of Ace the Data Science Interview is shipped anywhere in the world, and a job-hunt video course includes downloadable resources.

How it charges

Subscriptions cost $5 per month. The site also shows yearly options at $60 and $180, with $180 marked BEST VALUE!

Where customers come from

The site offers a free 9-Day Data Interview Crash Course and a free SQL Tutorial for Data Analytics. It also publishes a DataLemur Blog and an Amazon SQL Interview Questions guide.

What stands out

DataLemur gives data scientists, data analysts, and data engineers interview practice across SQL, Statistics, Probability, and Machine Learning. One related product is a signed paperback shipped worldwide, and another is a job-hunt video course with downloadable resources.

The related book has helped 16,000+ readers prepare for interviews. Nick Singh says he has coached over 600 people into data roles, and his career tips have earned him over 150,000 followers on LinkedIn.

From the official site

I know first-hand how difficult Data Science, Data Analyst, & Data Engineering interviews can be.

100+ SQL Interview questions, from companies like Facebook, Google, and Amazon, with multiple hints and full solutions!

1-hour video call with Nick Singh (Ex-Facebook & Author of Ace the Data Science Interview) – get your resume and LinkedIn reviewed, get personalized job hunting tactics, and/or do a mock FAANG technical interview!

Excerpts from the official website, fetched October 1, 2026.

Where it sits in the data

DataLemur's $1.5K a month is higher than 46% of the 6,604 projects with founder-reported monthly revenue in our dataset; the median across them is $2K. Snapshot: 2026-09-30. The dataset only covers founders who chose to publish their numbers, so it leans toward businesses that work; use it for scale, not as an average.

Currency

All figures are in US dollars as published. A rough yuan or euro conversion is not applied here because prices, taxes and acquisition costs differ by country.

Could you build something like this?

My view: demand would come from people preparing for technical interviews in data science, data analytics, data engineering, SQL, statistics, probability, and machine learning. The buyer is a candidate seeking structured practice, hints, solutions, coaching, or job-search materials.

My view: distribution could come from free courses, a free SQL tutorial, a blog, downloadable interview resources, and company-specific question pages. Building the product would require maintaining accurate question sets and solutions, handling coaching or support, and competing with other interview-preparation offerings.

Verdict: Needs real work.

One thing to take from it

DataLemur combines practice questions, full solutions, coaching, a book, a course, and free educational materials around interview preparation for data roles.

Sources

DataLemur official website, fetched October 1, 2026
DataLemur pricing page, fetched October 1, 2026
Indie Hackers product page: revenue founder-reported on the Indie Hackers product page (not independently verified), as of September 2023

Revenue, team and start-cost figures are what the founder reported at the interview date, not current figures and not a prediction of what you will earn. Product and pricing facts come from the business's own website as checked on 30 September 2026. Method & sources · Disclosure