FreeC# BasicsEasy
What is the difference between managed and unmanaged code in .NET?
Open in the library
2026 cohort — pattern-first prep
Stop grinding.
Start recognizing.
ProgramAlpha teaches the 100 patterns that show up in real interviews — then lets you practice them against curated problems judged in your own browser.
No credit card1,200+ curated problemsVerdict runs in your browser
Hash Map LookupFrequency CountingPrefix Sums & ProductsRunning Min / Max in One PassCyclic SortDutch National FlagBoyer-Moore Majority VoteDuplicate Detection via Set+92 more →
ProgramAlpha — recognize the pattern, then practice it
animating ✨
Verdict runs in your browserFree plan forever
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- Curated problems
- 1,200+
- Curated problems
- Solutions submitted
- 120k
- Solutions submitted
- Core DSA patterns
- 16
- Core DSA patterns
- Design chapters
- 23
- Design chapters
Free, first
Sample the library before you register
No paywall ambush. Read a real answer and a real chapter — then decide if the full library is worth it. It is.
1
FreeStart here · Core
System Design in 30 Minutes
A repeatable talking skeleton for design rounds: requirements → estimation → components → trade-offs.
4
FreeHigh-level design · Easy
Rate Limiter
Design a rate limiter used at the API gateway.
Plushld · Medium
Scale from Zero to Millions
Members read this full chapter. You get the pattern, they get the blueprint.
500 answers · 23 chapters · every problem in the lab
Alpha Plus unlocks the full walkthroughs, the complete answer bank and every practice problem.
Everything in one lab
Built for the way interviews actually work
ProgramAlpha is a closed loop: learn the pattern, solve the problem, get judged, and track the streak. Nothing else gets in the way.
Practice Lab
A structured bank of curated problems with difficulty, topics and company tags — filter, solve, and get judged instantly.
Open the labPattern Explorer
Sixteen patterns that keep repeating in interviews, with worked examples — so you spot the trick before you write a single line.
Learn patternsSystem Design Blueprint
HLD and LLD modules that turn design interviews from guesswork into a clear 30-minute walkthrough.
Study designInterview Arena
Timed mock rooms that recreate the pressure — the same question format, pacing and rubrics as real interview rounds.
Enter the arenaProgress Pulse
Solve streaks, topic coverage and confidence scores that show — with data — exactly where to focus next.
See your pulseAlpha Tracks
Sequenced learning paths that carry you from warm-ups to hard problems, without the guesswork of what to do next.
Start a trackHow it works
From first login to first offer
A diagnostic maps your gaps, then the platform sequences your reps. You always know what to learn next.
- 01
Assess where you stand
Answer a short diagnostic and the system maps your strengths onto the pattern model — no endless forms, just a few focused questions.
- 02
Follow a track, not a random list
Alpha Tracks sequence concepts and problems, so each session reuses what you learned the day before.
- 03
Practice under real conditions
Solve in the editor, run the judge, then step into timed Interview Arena rooms to train your pace and composure.
- 04
Let the data steer your prep
Progress Pulse surfaces the exact topics costing you points, so week four is different from week one.
Loved by grinds
Offers, not just progress bars
Real stories from engineers who used ProgramAlpha to get ready.
AMArjun Mehta
SDE-2 at a Bengaluru fintech
“The Interview Sprint track was tough but worth it. After three timed mocks I stopped panicking mid-problem — that was the whole interview.”
SISneha Iyer
Self-taught → Frontend role at a startup
“I used to solve random problems and forget everything. The Alpha Tracks sequence finally made the patterns stick, because each one built on the last.”
RKRohan Kulkarni
SWE2 at an Indian product company
“Progress Pulse showed me I was solving easy problems again and again instead of fixing my weak areas. Two focused months and my medium-problem rate tripled.”
FKFatima Khan
Preparing for senior-level interviews
“The system design modules gave me a 30-minute plan I could actually follow live. I went from rambling to leading the room.”
VRVivek Reddy
CS graduate, Hyderabad
“The behavioural story bank is underrated. I walked in with three clear stories and finally got to talk about work I was proud of.”
NPNisha Patel
Backend engineer
“This is the first prep tool where the dashboard actually matches reality. The daily streak quietly turned practice into a habit.”
Pricing
Start free. Scale when you're ready.
Everything on Starter is free forever. Upgrade when you want the full pattern library and interview rooms.
Starter
For getting a feel of the platform.
₹0 / month
- 60 curated problems
- Pattern Explorer (read-only)
- Progress Pulse basics
- Community support
Most popular
Alpha Plus
For engineers actively preparing.
₹499 / month
- Full Practice Lab (1,200+ problems)
- All Alpha Tracks
- Interview Arena with timed mocks
- System Design Blueprint
- Detailed skill analytics
- Priority support
Compare all plans
Free, Plus and Teams pricing in ₹ or $
See pricingFAQ
Questions, answered
How is ProgramAlpha different from grinding random problem lists?
Every problem is tagged with a pattern, a difficulty and the companies that ask it. Alpha Tracks sequence those problems by dependency: you learn a technique, practice it immediately, and only then advance. Grinding random lists builds recall; ProgramAlpha builds recognition.
Is there a free tier?
Yes. The Starter plan is free forever and includes curated problems, the read-only Pattern Explorer and core progress tracking. Upgrade when you want the full problem bank, tracks and interview arena. Prices can be viewed in Indian Rupees (₹) or US Dollars ($).
What languages does the Practice Lab judge support?
The in-browser judge currently simulates evaluation for JavaScript solutions so you can work offline. A production sandbox supporting JavaScript, Python, C++ and Java can be wired in via the API layer described in the codebase.
How long should I prepare before interviews?
Most engineers see steady gains within 4–6 weeks of consistent daily practice. The Interview Sprint track is built for the final two weeks before a loop. Start earlier if you can — the system design path benefits from more runway.
Ready to get interview-ready?
Join ProgramAlpha free, take the diagnostic and start your first track today.