- Home
- Case studies
- Case
Hardware interview prep, $3.4K in 30 days: a $99 lifetime plan
Voltage Learning is interview preparation for electrical, hardware, and electronics engineers. Its $3.4K in the last 30 days is verified through the payment provider's API by TrustMRR (Stripe), as of September 30, 2026.
What it actually sells
Voltage Learning provides hardware engineering interview preparation through technical questions, exercises, feedback, and behavioral practice.
Its question banks cover more than 200 hardware engineering roles, with graded and dynamic AI-driven feedback. The paid plan includes more than 600 guided exercises and 300 behavioral scenarios.
How it charges
Free access is available. The paid lifetime plan costs $99, discounted from $199, for lifetime access. The site presents this as one payment with lifetime access.
Month by month
Monthly revenue as read from the payment provider by TrustMRR, in US dollars, as of September 30, 2026.
| Month | Revenue (USD) |
|---|---|
| 2025-10 | $5 |
| 2025-11 | $383 |
| 2025-12 | $233 |
| 2026-01 | $442 |
| 2026-02 | $1,509 |
| 2026-03 | $2,411 |
| 2026-04 | $1,879 |
| 2026-05 | $1,117 |
| 2026-06 | $2,531 |
| 2026-07 | $2,468 |
| 2026-08 | $3,100 |
| 2026-09 | $3,350 |
Where customers come from
The site says that more than 10,000 engineers are practicing with Voltage Learning. It lists interview preparation at NVIDIA, Apple, Intel, Qualcomm, and more.
Visible site signals include a downloadable resume template in the free plan and interview guides.
What stands out
The service combines role-specific and company-specific interview questions with AI-powered feedback on answers, a structured way to identify weak areas, and progress tracking.
Voltage Learning is rated 4.5/5 by engineers. The question bank contains more than 5,000 hardware interview questions, while the paid plan includes more than 600 guided exercises and 300 behavioral scenarios.
From the official site
Voltage Learning gives hardware and electronics engineers a real place to practice: role-specific and company-specific interview questions, AI-powered feedback on their answers, and a structured way to identify and close their weak areas before the real interview.
Practice interview questions from 200+ of the hottest roles in the field, with graded and dynamic AI-driven feedback to ensure success on your next interview.
Excerpts from the official website, fetched October 1, 2026.
Where it sits in the data
Voltage Learning's $3.4K in the last 30 days is higher than 87% of the 5,602 projects with payment-verified revenue in our dataset; the median across them is $150. Within the “Education” category (517 projects) it is higher than 89% (category median $156). Snapshot: 2026-09-02 to 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 is that the buyer is a hardware or electronics engineer preparing for a technical interview, and distribution would need to come from search, technical communities, career content, or referrals. The product shape is understandable: questions, exercises, answer feedback, and progress tracking.
The difficult parts are keeping a large question bank accurate, making feedback useful for different roles, and handling support from candidates preparing under deadline. Competition and changing interview materials would also require ongoing work. Regulation is less central than content quality and support load in this category.
Verdict: Needs real work.
One thing to take from it
The clearest lesson is to package preparation around a specific professional audience and a concrete job process. Voltage Learning sells technical questions, guided exercises, behavioral scenarios, feedback, and progress tracking under a $99 lifetime plan.
Sources
- Voltage Learning official website, fetched October 1, 2026
- Voltage Learning pricing page, fetched October 1, 2026
- Voltage Learning about page, fetched October 1, 2026
- TrustMRR: revenue verified through the payment provider's API by TrustMRR (Stripe), as of September 30, 2026
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