352 problems filed under the pattern that solves them, mock interviews you answer out loud, and 26 algorithms you can watch run on your own input.
Coding courses built for students and working professionals, online or on campus.
Instead of: Watching playlists, then forgetting
Each concept starts as a story, then code.
A stack is a pile of plates: last on, first off.
stack.push(plate) · stack.pop()
Instead of: Nobody reviews your code
A working engineer reviews your code, 1:1.
Mentor reviewWhy a hash map here? What does it cost in memory?
To make each lookup O(1).
Instead of: Guessing what they ask
Instead of: Freezing in your first interview
Coding, design and HR rounds, scored.
Instead of: Random practice, copied projects
Daily practice, weekly tasks, one project.
Instead of: No proof to show
Verifiable online, plus placement support.
How placement worksNot a course, not a question bank, not an interview tool. All of it, in one place.
Next: technical depth
What you learn is what you build, and every mock adds to your score.
Your readiness score follows you and tells you when you're ready.
ForFirst-year studentsNon-CS gradsCareer switchers
A story lesson looks like thisHash table · 6 min
Imagine looking up a friend's phone number. In a list you'd scan every name. A hash table jumps straight to the slot. No scanning.
Then the codePython
phone = {}
phone["Riya"] = "98xxx"
print(phone["Riya"]) # one jump"Studying 9 to 11 pm after site work. The lessons respect that: six minutes, one idea, then drills."
ForCS studentsFinal-yearsWorking developers
A company question looks like thisSample · Amazon · Medium
Return the k most frequent numbers. Then the follow-up: "What does your sort cost you?"
Your answerPython
from collections import Counter
import heapq
def top_k(nums, k):
count = Counter(nums)
return heapq.nlargest(k, count, key=count.get) # O(n log k)"A mock round interrupted me mid-sentence with 'what does that sort cost you?' My actual campus interviewer asked nearly the same thing."
One program, three roles to aim for. Launching soon at CodeStory, with the same 1:1 mentors and mock rounds.
Launching soon. The early list is open.
CODESTORYAI PROGRAM
Builds LLM features into real products, and proves they work with evals.
RAGevalstool callingFastAPI
You shipA production RAG app with measured accuracy
CODESTORYAI PROGRAM
Works with a client, understands their real problem, and ships an AI solution on their data.
agentsintegrationsMCPdemos
You shipA client-brief capstone, shown on demo day
CODESTORYAI PROGRAM
Builds agents that plan, use tools, remember, and finish multi-step tasks.
LangGraphmemorymulti-agentMCP
You shipA multi-agent system with real tools
Every role getsLLM internalsFine-tuning with LoRALLMOpsAI system design interviews1:1 mentorMock rounds
Join the early list. No payment now.
Ranked mentors in every class. Founders and tech leaders every weekend.
Teaches every live class. Has cleared the rounds you are scared of.
We bring mentors who clear a high bar: LeetCode 2000+, contest ranks, IIT, top companies.
1:1 code reviews
Every weekend, a startup founder, an MNC manager or a CXO joins live. Ask them anything.
Guests revealed each month
Both CodeStory founders teach every weekend session. Doubts are answered in the batch channel.
Resume rebuilt with your mentor
Click any card to read it in full.
PriyaCSE 3rd year · BhopalI had watched three playlists on binary search and still froze in mocks. The postman story stuck in one evening, in my next mock I explained it while coding.
SnehaFinal year · PuneThe readiness score told me I wasn't ready when I felt ready. That stung. It was also right: the system design axis was 40. Two weeks later it wasn't.
AmanMechanical → SDE trackStudying 9–11 pm after site work. The lessons respect that, six minutes, one idea, then drills. No 40-minute lecture guilt.
IshitaCSE 2nd year · IndoreThe free plan is actually free. I practised three mocks a week for a month before paying a rupee, and paid because the scored mock rounds were worth it.
KartikFull-stack trackThe IDE runs real code. My order-tracking project from here is the one I talked about in my internship interview, not a to-do app. That mattered.
RohanPlaced after 7 mock roundsA mock round interrupted me mid-sentence with "what does that sort cost you?" My actual campus interviewer asked nearly the same thing. I smiled.
HarshBackend · Java · Online 01ShippedPayroll-slab engine with audit logs, built to spec
YashData · AI-ML · Online 02ShippedLead-scoring model on real sales-call data
ArjunBackend · Java · Campus 01ShippedUPI-style payments service: idempotent, double-entry
NehaFrontend · React · Campus 01ShippedDesign-system dashboard used by a real client
SahilBackend · Python · Campus 01ShippedRate-limited public API + monitoring, deployed live
PoojaData · AI-ML · Campus 02ShippedRecommendation pipeline on real e-commerce data
ManavFull-stack · Node · Campus 02ShippedRealtime order-tracking app, WebSockets end to end
TanviFrontend · React · Online 01ShippedA/B-tested landing system with real analytics wiring
RitikaFull-stack · Node · Online 01ShippedLive-class attendance + quiz tool, deployed for a tutor
SimranBackend · Python · Online 02ShippedTest-series API with rank calculation at scale
Practice, interviews and the tools, all free to start. Swipe to see the rest.
Problems filed under the pattern that solves them, not a sheet.
352 problemsOpenPractise what one company actually asks, the week before the round.
463 companiesOpenPick the role, write in a real editor, and answer while you type.
scored reportOpenYou answer out loud, it follows up on what you said.
36 topicsOpenDBMS asked the way a panel asks it: indexes, joins, normal forms.
in Core CSOpenInheritance, polymorphism and the follow-up you never rehearse.
in Core CSOpenHow real systems are built, from the primitives to the AI stack.
27 chaptersOpenReal schemas, your query, the rows it returns, and an honest verdict.
39 questionsOpenQuant, logical, verbal, DI and technical, timed like the real test.
280 questionsOpenA clock, marks per question and hidden tests, like a company's judge.
37 papersOpenWatch it run on your own input, one step at a time.
26 algorithmsOpenHints one at a time, AI review before a mentor reads it.
100 free creditsOpenBuild it inside the app, next to the work you practised.
in the appOpenOne score, and the axis you are weakest on.
tracked dailyOpenFree to start: 100 AI credits when you sign up and 100 every month. Start free in the app
Still not sure? A mentor answers on a free call.
Talk to mentorBoth. The online live batch runs for 2 months with evening, night or weekend slots. The campus batch runs for 6 months, full-time and in person, with 20 seats a batch.
DSA in Java, Python, C++ or JavaScript, then a job track: Full Stack MERN, Java Full Stack, MERN + AI or DevOps. Online it is a 2-month live batch: DSA Only for ₹6,999 or the Full Course for ₹8,999. On campus it is a 6-month full-time batch. The AI Engineer and Forward Deployed Engineer programs are launching soon.
Yes. You start at Foundations: a story lesson, six minutes, one idea, then a small drill. Your mentor tells you when you are ready to move on.
Yes. Evening batches run one focused hour, 3 to 4 days a week, and there are night and weekend batches too. Your exact slot is fixed on the onboarding call.
Yes. Your certificate has a public verification link that a recruiter can check in one click.
No honest company can. Here is what we do: a scored mock round every Sunday, one readiness score, and the top 20 of every batch get the full placement drive (referrals and partner interviews until the offer) plus a 1:1 with a working engineer, free.
1,200+ questions tagged by company and level, including Amazon, Google, Microsoft, TCS, Infosys, Flipkart, Zomato and Paytm.
Yes. The free platform has 20 story lessons, the browser IDE and 3 AI mock interviews a week. No card needed.
It is launching soon. Join the early list in the AI section and we will call you first.
Tell us who you are. On the call we help you pick the right batch.