AI mock interview with Sia
Sia is the AI interviewer on 99interview. It runs a real technical round: one question at a time, a follow-up on what you actually said, and a scored breakdown the moment you finish. No scheduling and no waiting for an interviewer, so you can run a round the night before an interview or at lunch on a workday.
From setup to your score
Four steps, in order. Nothing to install.
Set up the round
Choose a track or technology, a difficulty (Beginner, Standard or Senior) and how long the round runs.
Choose the interviewer style
Encouraging, Standard, or Challenging: no praise and a follow-up on everything.
Answer, and get pushed
Sia follows up on gaps in your answer instead of moving on, the way a real interviewer would, and stays on a topic until it is covered.
Read your scores
Scored on technical depth, problem solving, communication, behavioural and code quality, with what to work on next — the same criteria a live interviewer uses.
Built to show you what to fix
Any hour
No calendar. Start a round whenever you have the time and finish it in one sitting.
Built around your resume
Attach your resume and questions get anchored in your real projects and roles instead of being generic.
Different each time
Sia remembers what it asked you before and moves to new ground, so a second round is not a repeat of the first.
Comparable scores
The same five criteria as a live round, so you can see whether you are improving across both.
When it helps most
Running several rounds before a live interview to find your weak areas.
Rehearsing a specific technology the night before an interview.
Getting comfortable answering out loud, under follow-up questions.
What candidates ask first
How is a round with Sia different from a question list?
Sia asks one question at a time and follows up on your answer. A shallow answer gets a deeper question on the same topic, not a new unrelated one.
How long does a round take?
You choose the length when you set it up. The options and their prices are on the pricing page.
Can I set the difficulty?
Yes: Beginner, Standard or Senior. You choose the interviewer style as well.
Is it scored the same way as a live interview?
Yes. Every round is scored on technical depth, problem solving, communication, behavioural and code quality.
Your next round can start tonight
No calendar and no waiting for an interviewer. Pick a track, choose how hard, and get your scores the moment you finish.
Start a round with Sia