Generic prep works until about a month out. After that, the question changes from "am I good at coding interviews?" to "am I ready for Google's?" Each big company asks its own mix of problems, at its own bar for each level, in its own format.
Here's how I'd prep for one specific company, with the tool I'd use for each step. I built one of them, DevInterview.AI, so I've marked it. Every price comes from the vendor's own site, checked on October 19, 2026.
The tools
| Tool | How it's company-specific | Price as billed |
|---|---|---|
| LeetCode Premium | Questions tagged by company, with how often they come up; timed company tests | $35/mo (list $39), $159/yr |
| Hello Interview | Company guides by level, and questions candidates reported | $59 (1 month), $119 (1 year), $399 lifetime; sale running when I checked |
| DevInterview.AI (mine) | Unlimited voice mock interviews set to your target company and level | First interview free; $19.99/mo, $49.99/qtr, $99.99/yr |
| interviewing.io | A mock with an interviewer from your target company, on request | From $179; price varies for a company-specific interviewer |
| IGotAnOffer | Coaches who are calibrated interviewers for that company and role | $50 a credit, 2 to 5 credits an hour |
Step 1: Learn what the company actually asks
Company tags tell you which patterns come up more often, not which exact question you'll get. Use them to aim your drilling, not to memorize.
LeetCode Premium's company tags and timed company tests are still the standard question list. Hello Interview's guides walk through the process at each level, like its Google L4 guide. For a free version, every company on DevInterview.AI has a public profile showing the topics and difficulty it asks most.
Step 2: Run that company's round out loud, many times
This is the step most people skip. They drill the questions in silence, then walk into an interview where they have to explain every step to someone who keeps asking questions.
DevInterview.AI, which I built, lets you set every mock interview to a company and your level, junior through staff. For coding, the interviewer uses that company's tagged questions, 1,800+ for Google and 1,600+ for Amazon, in an editor that runs your code, and asks follow-ups the way a real interviewer does. System design runs 45 minutes on a canvas, with problems chosen to fit the company. For behavioral, the questions are set to your level and the interviewer plays a hiring manager at that company. Every round ends with a scored report and a hire verdict.
It's unlimited for $19.99 a month, and the first interview is free, no card. In the last two weeks, you can run your target company's round every day for less than one human session. Every rating it has ever received is public on its reviews page.
Where it falls short: it's an AI, not someone who has sat on that company's hiring committee. And for smaller companies without enough tagged questions, coding falls back to questions for your level.
Step 3: One human read from someone who knows the company (optional)
interviewing.io can match you with an interviewer from your target company. Sessions start at $179, and per its FAQ the price varies with the subject and whether you want an interviewer from a specific company.
IGotAnOffer lets you pick a coach who's a calibrated interviewer for that company and role, like its ex-Google interviewers. A credit is $50, and coaches charge 2 to 5 credits for a one-hour session, so roughly $100 to $250.
Do this once, in the final week or two, after you've done your reps. It's a calibration check, not where you build the skill.
What about Aced (formerly Exponent)?
Aced organizes its guides, reported interview experiences and coaches by company, and free accounts get 5 peer mock interviews a month. Its AI mock interviews come with the Expert plan ($99/mo, or $20/mo billed yearly), and its FAQ describes them as 10 to 20 minute audio sessions on common behavioral and product management questions, with no live coding.
Where this fits
If you're more than a month out, start with my 8-week study plan instead: NeetCode for patterns, Hello Interview for system design, DevInterview.AI to practice out loud, and an optional session with a human interviewer.
Prices checked on each vendor's own site on October 19, 2026. The full comparison, with sources, is on devinterview.ai.
