Learn with roadmaps, courses and pattern sheets. Practise with real code and an AI coach that answers on the exact line you ask about. Then take AI mock interviews for every round, from online assessments to the final loop.
FREE TO START · NO CARD · CODE THITA15 TAKES 15% OFF EVERY PLAN
Roadmap. A plan for every day until your interview. Open roadmaps →
Interviewers expect you to explain trade-offs, handle follow-up questions and change your approach when the requirements change. Studying alone rarely prepares you for that part.
Thita teaches the material properly, then lets you practise saying it out loud to an interviewer who asks the next question.
Start anywhere. Many people take one mock interview first to see where they stand, then follow the plan their report suggests.
Roadmaps, courses and pattern sheets for DSA, system design, low-level design and CS fundamentals.
Write code in six languages against hidden test cases, in practice mode or as a timed online assessment.
Take voice mock interviews for each round of a company's loop and get a report graded against your target level.
Follow a day-by-day plan with lessons in the right order, and problems that use what you just learned.
Two 90-day roadmaps, one for working professionals and one for college placements. Each day has lessons, problems and mock interviews in order, and your progress is saved so you always know what comes next.
See the roadmaps →Each lesson explains one idea step by step with diagrams and short checks, and ends with something you build or solve yourself.
Browse courses →Every topic is organised around the patterns interviewers reuse. Learn a pattern once, then recognise it in problems you have not seen before.
99 patterns in 16 families, covering 410 problems.
Open the sheet →
12 families, 73 lessons and 26 case studies.
Start system design →
12 families and 46 lessons on classes, interfaces and extensibility.
Start low-level design →
Operating systems, DBMS, computer networks and maths, taught through the patterns interviewers ask about.
Start CS fundamentals →
NeetCode 150, NeetCode 250 and company sheets, mapped to the same patterns.
Browse sheets →Ask a question
in any lesson.
It explains out loud
and draws while it talks.
Write solutions in Python, C++, Java, JavaScript, Go or C#, and run them against hidden test cases, including large inputs that catch slow solutions.
When something fails, select the line and ask about it. The AI coach answers right next to that line, using your own code, and guides you to the fix without handing you the full solution.
Choose a company, role and level. The AI interviewer runs each round the way that company does.
The interviewer speaks with you, asks follow-up questions based on your answers, and raises the bar when you answer well. Scroll through a loop.
def merge_intervals(intervals): intervals.sort(key=lambda x: x[0]) merged = [intervals[0]] for start, end in intervals[1:]: if start <= merged[-1][1]: merged[-1][1] = max(merged[-1][1], end) else: merged.append([start, end]) return merged
InterviewerWhat happens if the input list is empty?
InterviewerAn account with 40 million followers just posted. What happens to your fan-out?
InterviewerHow would you add gift cards without changing the checkout class?
Timed problems with hidden test cases and no interviewer, the way most companies screen. You see which cases failed and why.
Take a timed OA →Solve a problem out loud in a real code editor and run it against test cases. The interviewer asks about edge cases, complexity and testing while you write.
Practise a coding round →Design a system on a shared design canvas while you talk it through. When your design works, the interviewer changes the requirements to see how you adapt it.
Practise a system design round →Model classes and interfaces on the design canvas or in code, then extend them when a new requirement arrives without rewriting what already works.
Practise a low-level design round →Talk through your own projects and decisions. Follow-up questions test ownership, judgement and how you handle disagreement.
Practise a behavioural round →After each round you get scores against the level you are targeting, with the exact moment each score is based on.
Take a round and get your report →Close calls are often decided by small habits, not the final answer. Each report lists the moments that helped or hurt you, with a timestamp, and links to the lesson that fixes the gap.
Asked about the read/write ratio before drawing anything.
HelpedSaid "it depends" twice, and both times explained what it depends on.
HelpedChanged the design when the follow-up broke it, instead of defending it.
HelpedWent quiet for 70 seconds while debugging. Say what you are checking.
Hurt
I spent thousands on interview coaching before finding thita.ai. The AI gives similarly detailed feedback, available instantly, at a fraction of the cost. The code review feature caught edge cases I always missed.
With a full-time job and family, I could only study late nights. thita.ai's AI interviewer was always available. I practiced during my own hours and cleared my interviews after two months of consistent prep.
Unlike platforms where you just grind problems, thita.ai focuses on pattern recognition and problem-solving approaches. The AI explains the why behind solutions, not just the what.
I've tried probably eight different platforms. thita.ai has the cleanest interface and smoothest experience. The code editor, real-time feedback panel, and session summaries make practicing enjoyable.
After each coaching session, thita.ai generates detailed notes with visual diagrams explaining my solution and alternatives. Reviewing them before interviews gave me clarity and confidence.
As someone with five years of experience, most platforms felt too basic. thita.ai's AI quickly assessed my skill level and challenged me with appropriate problems.
Before thita.ai, I was hopping between random YouTube videos and blog posts with no clear direction. This platform gave me structure and a roadmap.
I struggled with system design for months after passing DSA rounds. thita.ai's structured approach and instant feedback helped the patterns finally click.
I've done mock interviews on Pramp and interviewing.io, but thita.ai's AI interviewer feels the most natural. It asks follow-up questions, challenges assumptions, and behaves like a real interview.
Five-star ratings from inside the product, then messages people sent us on LinkedIn and threads from Reddit, unedited. Hover to pause, or tap a screenshot to read it in full.
Been using Thita.ai for DSA prep recently. What stood out is the structured approach — not just random problem solving. The AI coach + pattern-wise roadmap actually helps in building clarity. Feels more like guided prep than guessing what to do next.
Such a great roadmap. I am preparing for AI engineer roles and looking for a platform where I can learn DSA and system design. I am in love with this platform. I will sure recommend to my friends.
So far this is the best platform that I have used for DSA practice and sheets well organized. Thanks for keeping it free.
Every thing is well structured, i love solving the question on your platform … every thing is top notch.
the best resource for learning dsa i have used so far love you guys!
I just started this site, and I find it quite helpful for DSA structurally, which helps my problem-solving approach.
thanks for providing it free and please let it be free i will share it with all of my colleagues
i would like u to keep this DSA pattern sheet free as this is a good list of problems to solve.
All good and DSA patterns looks solid.
Good UI of the website and better to use all functionality.
very nice and interactive ui
UI is flawless
Good app, good UI
User friendly, easy to navigate while learning.
Pro and Elite refill AI practice monthly and include both 90-day roadmaps while you subscribe. Lifetime is one payment for every learning path and both roadmaps, forever.
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Explore the platform
Focused preparation across selected paths
All-track preparation with the highest practice allowance
Own every path and both day-by-day roadmaps
Starter: core learning with limited recurring practice.
Pro: DSA plus two selected deep-dive paths, monthly AI practice, and both 90-day roadmaps while subscribed.
Elite: every live path, the highest recurring AI allowance, and both 90-day roadmaps while subscribed.
Lifetime: every path, both 90-day roadmaps forever, and 32 shared AI credits granted once.
Open the full entitlement details
01DSA PATTERNS · 8 MIN READ
02AI INTERVIEWS · 9 MIN READ
03RESUME NOTES · 10 MIN READ
Thita.ai is AI interview prep from your first lesson to the final round: roadmaps, courses and pattern sheets to learn, real code practice with an AI coach, and AI mock interviews for every round, from online assessments to system design and behavioural rounds.
DSA through 99 patterns and pattern sheets, system design, low-level design and CS fundamentals such as operating systems, DBMS and networks. Roadmaps put these in a day-by-day plan.
While you practise, you can select any line of your code and ask a question about it. The AI coach answers next to that line, using your code as the example, and guides you towards the fix instead of giving you the full solution. In lessons it can also explain out loud and draw on a canvas.
It speaks with you in real time, asks follow-up questions based on what you said, and follows the format of the company and round you chose. It changes its questions and its bar for the level you are targeting.
Yes. Senior rounds focus on system design depth, trade-offs and scope. The interviewer pushes on those areas, and the report grades you against the level you are targeting rather than a general score.
Yes. Timed online assessments run against hidden test cases in 6 languages, with no hints and no interviewer, and end with a score report showing which cases failed.
Yes. Starter learning routes begin with foundations and progress toward advanced patterns, system design, and role-specific practice. You do not need prior interview-preparation experience.
Core learning and limited practice are free on Starter. Pro adds recurring AI practice and selected deep-dive paths; Elite adds all-track access and the highest recurring practice allowance.
Thita Lifetime is a one-time purchase (₹5,880 / $69, or ₹4,998 / $59 with code THITA15, all before 18% tax). It includes lifetime access to all 11 learning paths, both 90-day roadmaps, and 32 shared AI credits granted once. Pro and Elite refill their practice allowance every month and include both roadmaps while you subscribe.
The College and Professional 90-day roadmaps are included with Pro and Elite for as long as you subscribe, and with Thita Lifetime forever. They are no longer sold on their own; if you already bought a roadmap, you keep it.
Create an account, choose the role you are preparing for, and begin with the next suggested lesson or practice. The core Starter experience does not require a credit card.
Either way, you will know what to work on next by the end of the day.
Thita.ai (Thita is pronounced like theta, the Greek letter, so many people search for it as Theta AI) is a technical-interview preparation platform for software engineering, system design, low-level design, data science, AI/ML and product management roles. It combines a 99-pattern DSA library across 16 families (410 executable problems), live-voice AI mock interviews with structured feedback, an AI coach, system design and low-level design courses, and an AI resume analyser. 30,000+ engineers have used it. A free tier is available; paid plans start at $14.99/month (₹1,179/month in India, GST included), and one-time lifetime access to all learning content is ₹5,880 (US$69) plus 18% GST.
