Coding Rounds
Solve real LeetCode-style problems with an AI interviewer that hints, challenges, and evaluates your approach, just like the real thing.
AI-Powered Interview Practice
Practice real technical interviews with AI and see exactly what to improve
Run realistic coding and behavioral mocks free. Unlock live system design practice on Pro. Get instant scoring, targeted feedback, and a clear practice plan before your next real loop.
No credit card required
3 free interviews/month
System design on Pro
Instant AI feedback
Get the free system design PDF →
Static study guide. Live system design practice is on Pro.
Free system design study guide (PDF)
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Interview types covered
Why mock interviews fail without real feedback
Most interview prep misses the most critical element: honest, structured feedback on your actual performance.
LeetCode doesn't simulate the interview
Solving problems in silence is nothing like explaining your reasoning to an interviewer who asks follow-up questions and challenges your assumptions.
Mock interviews with peers lack rigor
Friends and study partners can't give you calibrated, consistent feedback based on what real interviewers actually look for.
Interview coaches are expensive and hard to schedule
Paying $150/hour for limited sessions isn't scalable. You need to practice repeatedly, at any time, without friction.
No visibility into your weak spots
Without tracking your performance across sessions, you keep practicing what you're already good at instead of fixing what's holding you back.
Everything you need to nail the interview
Interview Simulator covers every stage of the modern technical hiring process, from algorithms to behavioral storytelling.
System Design
Walk through large-scale architecture problems with guided prompts and rubric-based scoring. Included on Pro.
Behavioral Prep
Practice STAR-method answers to the most common behavioral questions. Get scored on clarity, structure, and impact, not just effort.
Instant AI Feedback
Receive detailed, calibrated feedback after every answer, covering communication, correctness, problem-solving approach, and time management.
Progress Tracking
See your performance trends across sessions. Identify weak spots by topic, question type, and company tier so you practice what matters.
Interview Question Bank
Access hundreds of questions modeled on public interview formats.
From sign-up to offer letter
Three steps is all it takes to start getting real, actionable interview feedback.
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Pick your interview type
Choose coding, system design, or behavioral. Select your difficulty level and target company tier.
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Practice with AI feedback
Our AI interviewer asks follow-up questions, hints when you're stuck, and scores your answers in real time as you work through the problem.
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Review and improve
Get a detailed performance report after every session. Track progress over time and focus your next session on your weakest areas.
Built by an engineer clients trust
CodeSwiftr is built by Bogdan Veliscu, a senior software engineer with 10+ years of experience. Here's what past clients say about working with him.
★★★★★
"It was a pleasure to work with Bogdan. He is sharp and efficient and always kept the user's impact in mind. He always provided exemplary programming service, a proactive approach to agile development, and very clear communications."
★★★★★
"Professional, detailed and pleasant to work with. Bogdan led the development of both iOS and Android apps at Specta, facing both technical challenges and showing great leadership skills throughout."
★★★★★
"His deep technical knowledge and ability to work with a product team impressed me. He delivered great leadership to junior developers and was a clear communicator and a great problem-solver. I highly recommend him."
★★★★★
"His knowledge in the tech domain seems near endless. Any job you throw at him, he handles with professionalism and gusto. He is a thought leader, a mentor, and someone you can truly rely on."
Simple, transparent pricing
Start with 3 free mock interviews each month. Upgrade to Pro when you want unlimited practice and live system design rounds.
Monthly
Annual Save 33%
Free
Get started with no commitment
$
0
Forever free
- 3 mock interviews per month
- Coding and behavioral rounds (system design on Pro)
- Basic AI feedback
- Performance dashboard
Most popular
Pro
For serious interview prep
$
29
/mo
or $290/year, save $58
- Unlimited mock interviews
- All types: coding, system design, behavioral
- Advanced AI feedback and scoring
- Full question bank
- Progress tracking & weak spot analysis
- Interview session recordings
Team 5
For bootcamps, engineering managers, and career programs running mock interview practice at scale
$
99
/mo
5 seats included
- Everything in Pro
- Team progress dashboard
- Custom question sets
- Bulk seat discounts
- Admin controls
- Dedicated support
Team 10
For bootcamps, engineering managers, and career programs running mock interview practice at scale
$
179
/mo
10 seats included
- Everything in Pro
- Team progress dashboard
- Custom question sets
- Bulk seat discounts
- Admin controls
- Dedicated support
Get 50 system design questions free
A downloadable PDF of common system design questions, with frameworks for answering each one. Study offline. Practice live system design rounds on Pro.
50 System Design Interview Questions (PDF)
Covers distributed systems, databases, caching, and messaging. Frameworks for each prompt. This is a study PDF, not a mock interview.
Frequently asked questions
Everything you need to know about Interview Simulator.
What types of interviews does it cover?
Interview Simulator covers coding challenges (data structures, algorithms), system design interviews, and behavioral questions using the STAR method. New question types are added regularly based on current interview trends.
How realistic are the mock interviews?
Very realistic. Our AI interviewer mimics the pacing, follow-up questions, and evaluation criteria of real technical interviews, modeled on public interview formats.
Is there a free tier?
Yes. Free includes 3 mock interviews per month for coding and behavioral rounds. No credit card required. Live system design practice and unlimited interviews are on Pro.
Is the free system design PDF the same as Pro practice?
No. The free PDF is a static question list with frameworks. Pro unlocks live system design mock interviews inside Interview Simulator.
What are the questions modeled after?
Our question bank is modeled on public interview formats and spans a range of difficulty levels. Questions are updated regularly based on recent interview reports from the community.
Can I use Interview Simulator for system design practice?
Absolutely. System design interviews are available on the Pro plan. You'll walk through large-scale architecture problems with guided prompts, and your solution is scored against structured rubrics covering scalability, reliability, trade-offs, and communication.
What is the STAR method for behavioral interviews?
STAR stands for Situation, Task, Action, Result, a structured storytelling framework commonly expected in behavioral interviews. Interview Simulator coaches you to apply this framework and scores your answers on clarity, structure, and demonstrated impact.
Can I cancel my subscription at any time?
Yes. You can cancel your Pro or Team subscription at any time from your account settings. Your access continues until the end of the billing period. We do not charge cancellation fees. Contact [email protected] if you need help.
Ready to land your dream role?
Start practicing with realistic interview questions today. No credit card required.
3 free interviews every month, no credit card needed, cancel anytime